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EUVD-2026-369478

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:37

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:37:20.882898+00:00",
  "id": "EUVD-2026-369478"
}

CVE-2026-89927 (GCVE-0-2026-89927)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:40

Title

KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock Fix an issue where userspace or the guest can program an Hyper-V synthetic timer to have a deadline in the past via integer overflow, preventing the CPU from making progress and triggering an RCU stall. Hyper-V's SynIC exposes 4 per-vCPU synthetic timers to the guest, which are emulated by KVM. Each is programmed through the HV_X64_MSR_STIMERi_CONFIG and HV_X64_MSR_STIMERi_COUNT MSRs. Depending on CONFIG, COUNT represents either the absolute expiration time or the period of a periodic timer, both expressed in 100ns ticks. These timers may be set both by the guest (WRMSR) and the host (KVM_SET_MSRS). When the timer is enabled, stimer_start() translates COUNT to an absolute monotonic deadline and arms an hrtimer. If COUNT is set to a value close to U64_MAX, the deadline calculation can overflow. ktime_add_ns(ktime_now, 100 * (stimer->exp_time - time_now)) This can result in a CPU livelock. stimer_start() arms the timer via hrtimer_start() with a deadline in the past, which causes it to immediately fire. The stimer callback then raises KVM_RQ_HV_STIMER, with the intention of causing KVM to deliver a synthetic interrupt on the next vCPU guest enter. Then, once userspace issues KVM_RUN, vcpu_enter_guest() consumes the request, calling kvm_hv_process_stimers(). This would normally disable the timer via stimer_expiration() once the deadline is in the past. However, the deadline comparison is done between the KVM reference counter and stime->exp_time, which is a big value close to U64_MAX, so this never happens for a few thousand years. kvm_hv_process_timers() then re-arms the timer via stimer_start(), since it was not disabled, which again fires immediately. Before entering the guest, kvm_vcpu_exit_request() checks kvm_request_pending(), which returns true due to the newly raised KVM_REQ_HV_STIMER. Then vcpu_enter_guest() aborts the guest entry, returning early into vcpu_run(), which loops back again into vcpu_enter_guest(), restarting the cycle. Since there are no manual yields in this loop, a task with SCHED_FIFO may starve RCU grace-period kthreads, which exposes the stalls found by syzcaller: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=14269, q=1142 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294965239-4294954739), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10500 jiffies! g14269 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. ( ... ) Call Trace: <IRQ> __run_hrtimer kernel/time/hrtimer.c:1773 [inline] __hrtimer_run_queues+0x408/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 0b f4 5f f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 23 6b 27 f6 65 8b 05 7c 60 5a 07 85 c0 74 40 48 c7 04 24 0e 36 RSP: 0018:ffffc900040a7320 EFLAGS: 00000206 RAX: 5de15cb931505900 RBX: 0000000000000a06 RCX: 5de15cb931505900 RDX: 0000000000000007 RSI: ffffffff8daa9dc3 RDI: 0000000000000001 RBP: ffffc900040a73b0 R08: ffffffff8fc3d0 ---truncated---

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/a4665762388750e08…
https://git.kernel.org/stable/c/61954727ee08f026f…
https://git.kernel.org/stable/c/8aa467fe757d8cb22…
https://git.kernel.org/stable/c/8e19ded8433689164…
https://git.kernel.org/stable/c/6a8ba9213cce61345…
https://git.kernel.org/stable/c/3097582b73a8ed1cd…
https://git.kernel.org/stable/c/bdb732ebee545b7e3…
https://git.kernel.org/stable/c/0ca49fbd2883cd53d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < a4665762388750e08df99baabe5fce2a21d1423e (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 61954727ee08f026f5e1c9ee69e1b404a68f2f7a (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 8aa467fe757d8cb2278e98d7fbf44fc05eb0dbf8 (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 8e19ded84336891646b31375720717635f0fdd90 (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 6a8ba9213cce613455b1502ee0fd178656bf617b (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 3097582b73a8ed1cd6f6790fa78706f4a79b5a49 (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < bdb732ebee545b7e3bee7060efc754a8d99818b9 (git) Affected: 1f4b34f825e8cef6f493d06b46605384785b3d16 , < 0ca49fbd2883cd53d32d85b50feef17fa04d0fbf (git)
Linux	Linux	Affected: 4.5 Unaffected: 0 , < 4.5 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/hyperv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a4665762388750e08df99baabe5fce2a21d1423e",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "61954727ee08f026f5e1c9ee69e1b404a68f2f7a",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "8aa467fe757d8cb2278e98d7fbf44fc05eb0dbf8",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "8e19ded84336891646b31375720717635f0fdd90",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "6a8ba9213cce613455b1502ee0fd178656bf617b",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "3097582b73a8ed1cd6f6790fa78706f4a79b5a49",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            },
            {
              "lessThan": "bdb732ebee545b7e3bee7060efc754a8d99818b9",
              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
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            {
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              "status": "affected",
              "version": "1f4b34f825e8cef6f493d06b46605384785b3d16",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/hyperv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.5"
            },
            {
              "lessThan": "4.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: hyper-v: Clamp stimer deadline to avoid livelock\n\nFix an issue where userspace or the guest can program an Hyper-V\nsynthetic timer to have a deadline in the past via integer overflow,\npreventing the CPU from making progress and triggering an RCU stall.\n\nHyper-V\u0027s SynIC exposes 4 per-vCPU synthetic timers to the\nguest, which are emulated by KVM. Each is programmed through the\nHV_X64_MSR_STIMERi_CONFIG and HV_X64_MSR_STIMERi_COUNT MSRs. Depending\non CONFIG, COUNT represents either the absolute expiration time or the\nperiod of a periodic timer, both expressed in 100ns ticks. These timers\nmay be set both by the guest (WRMSR) and the host (KVM_SET_MSRS).\n\nWhen the timer is enabled, stimer_start() translates COUNT to an\nabsolute monotonic deadline and arms an hrtimer. If COUNT is set to a\nvalue close to U64_MAX, the deadline calculation can overflow.\n\n    ktime_add_ns(ktime_now, 100 * (stimer-\u003eexp_time - time_now))\n\nThis can result in a CPU livelock. stimer_start() arms the timer\nvia hrtimer_start() with a deadline in the past, which causes it to\nimmediately fire. The stimer callback then raises KVM_RQ_HV_STIMER, with\nthe intention of causing KVM to deliver a synthetic interrupt on the\nnext vCPU guest enter.\n\nThen, once userspace issues KVM_RUN, vcpu_enter_guest() consumes the\nrequest, calling kvm_hv_process_stimers(). This would normally disable\nthe timer via stimer_expiration() once the deadline is in the past.\nHowever, the deadline comparison is done between the KVM reference\ncounter and stime-\u003eexp_time, which is a big value close to U64_MAX, so\nthis never happens for a few thousand years.\n\nkvm_hv_process_timers() then re-arms the timer via stimer_start(), since\nit was not disabled, which again fires immediately. Before entering\nthe guest, kvm_vcpu_exit_request() checks kvm_request_pending(),\nwhich returns true due to the newly raised KVM_REQ_HV_STIMER. Then\nvcpu_enter_guest() aborts the guest entry, returning early into\nvcpu_run(), which loops back again into vcpu_enter_guest(), restarting\nthe cycle.\n\nSince there are no manual yields in this loop, a task with SCHED_FIFO\nmay starve RCU grace-period kthreads, which exposes the stalls found\nby syzcaller:\n\n    rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:\n    rcu:    (detected by 1, t=10502 jiffies, g=14269, q=1142 ncpus=2)\n    rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294965239-4294954739), jiffies_till_next_fqs=1, root -\u003eqsmask 0x0\n    rcu: rcu_preempt kthread starved for 10500 jiffies! g14269 f0x2 RCU_GP_WAIT_FQS(5) -\u003estate=0x0 -\u003ecpu=0\n    rcu:    Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.\n        ( ... )\n    Call Trace:\n     \u003cIRQ\u003e\n     __run_hrtimer kernel/time/hrtimer.c:1773 [inline]\n     __hrtimer_run_queues+0x408/0xc30 kernel/time/hrtimer.c:1841\n     hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903\n     local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]\n     __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062\n     instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]\n     sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056\n     \u003c/IRQ\u003e\n     \u003cTASK\u003e\n     asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697\n    RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]\n    RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194\n    Code: 74 05 e8 0b f4 5f f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 \u003ce8\u003e 23 6b 27 f6 65 8b 05 7c 60 5a 07 85 c0 74 40 48 c7 04 24 0e 36\n    RSP: 0018:ffffc900040a7320 EFLAGS: 00000206\n    RAX: 5de15cb931505900 RBX: 0000000000000a06 RCX: 5de15cb931505900\n    RDX: 0000000000000007 RSI: ffffffff8daa9dc3 RDI: 0000000000000001\n    RBP: ffffc900040a73b0 R08: ffffffff8fc3d0\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Guest WRMSR to HV_X64_MSR_STIMERi_CONFIG/COUNT is trapped into KVM (kvm_emulate_wrmsr -\u003e kvm_hv_set_msr_common -\u003e stimer_set_config/count); host userspace can also program the same MSRs via KVM_SET_MSRS, then KVM_RUN. Both paths are local KVM VM-exit/ioctl, not network, adjacent-radio, or physical.\nAC:L - The attacker fully controls COUNT/CONFIG. A one-shot COUNT near U64_MAX deterministically overflows 100*(exp_time-time_now), so hrtimer_start() uses a past deadline and kvm_hv_process_stimers() re-arms forever. CONFIG_KVM_HYPERV defaults to Y and hv-synic/hv-stimer are standard on Windows KVM guests; no race or rare config is required.\nPR:N - The highest-impact case is a cloud x86 KVM tenant whose VM already has Hyper-V CPUID and KVM_CAP_HYPERV_SYNIC (normal for Windows/hv-stimer guests). They WRMSR the stimer MSRs from guest CPL0 with no host root, init-namespace capability, or /dev/kvm access.\nUI:N - The guest programs the synthetic timer during ordinary KVM_RUN; the host vCPU thread livelocks on the same vcpu_enter_guest path with no additional victim action such as mounting a filesystem or opening a file.\nS:C - The retry loop runs in the host KVM vCPU thread (vcpu_run/vcpu_enter_guest) and can stall host CPUs, starve RCU, and OOM the machine, taking down the hypervisor and co-resident VMs and crossing the KVM guest-to-host security boundary.\nC:N - This is an integer overflow in the stimer deadline calculation that only mis-arms an hrtimer; there is no out-of-bounds read, use-after-free, or other host memory disclosure primitive.\nI:N - Host kernel memory is not written or corrupted; the overflowed deadline only produces a KVM_REQ_HV_STIMER/hrtimer retry loop with no arbitrary write or control-flow hijack.\nA:H - stimer_start() re-arms an immediately expiring hrtimer, kvm_vcpu_exit_request() aborts VM-entry, and vcpu_run() loops without a dedicated yield, livelocking the host vCPU thread. A SCHED_FIFO VMM can starve RCU (syzkaller RCU stall and expected OOM), denying service to the host and co-located VMs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:40:17.320Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a4665762388750e08df99baabe5fce2a21d1423e"
        },
        {
          "url": "https://git.kernel.org/stable/c/61954727ee08f026f5e1c9ee69e1b404a68f2f7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8aa467fe757d8cb2278e98d7fbf44fc05eb0dbf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e19ded84336891646b31375720717635f0fdd90"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a8ba9213cce613455b1502ee0fd178656bf617b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3097582b73a8ed1cd6f6790fa78706f4a79b5a49"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdb732ebee545b7e3bee7060efc754a8d99818b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ca49fbd2883cd53d32d85b50feef17fa04d0fbf"
        }
      ],
      "title": "KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89927",
    "datePublished": "2026-09-16T10:32:19.473Z",
    "dateReserved": "2026-09-11T19:38:34.775Z",
    "dateUpdated": "2026-09-16T14:40:17.320Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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EUVD-2026-369478

CVE-2026-89927 (GCVE-0-2026-89927)

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Sightings

Nomenclature

Related by attack behaviour