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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Don\u0027t advance iterator after restart due to yielding\n\nAfter dropping mmu_lock in the TDP MMU, restart the iterator during\ntdp_iter_next() and do not advance the iterator.  Advancing the iterator\nresults in skipping the top-level SPTE and all its children, which is\nfatal if any of the skipped SPTEs were not visited before yielding.\n\nWhen zapping all SPTEs, i.e. when min_level == root_level, restarting the\niter and then invoking tdp_iter_next() is always fatal if the current gfn\nhas as a valid SPTE, as advancing the iterator results in try_step_side()\nskipping the current gfn, which wasn\u0027t visited before yielding.\n\nSprinkle WARNs on iter-\u003eyielded being true in various helpers that are\noften used in conjunction with yielding, and tag the helper with\n__must_check to reduce the probabily of improper usage.\n\nFailing to zap a top-level SPTE manifests in one of two ways.  If a valid\nSPTE is skipped by both kvm_tdp_mmu_zap_all() and kvm_tdp_mmu_put_root(),\nthe shadow page will be leaked and KVM will WARN accordingly.\n\n  WARNING: CPU: 1 PID: 3509 at arch/x86/kvm/mmu/tdp_mmu.c:46 [kvm]\n  RIP: 0010:kvm_mmu_uninit_tdp_mmu+0x3e/0x50 [kvm]\n  Call Trace:\n   \u003cTASK\u003e\n   kvm_arch_destroy_vm+0x130/0x1b0 [kvm]\n   kvm_destroy_vm+0x162/0x2a0 [kvm]\n   kvm_vcpu_release+0x34/0x60 [kvm]\n   __fput+0x82/0x240\n   task_work_run+0x5c/0x90\n   do_exit+0x364/0xa10\n   ? futex_unqueue+0x38/0x60\n   do_group_exit+0x33/0xa0\n   get_signal+0x155/0x850\n   arch_do_signal_or_restart+0xed/0x750\n   exit_to_user_mode_prepare+0xc5/0x120\n   syscall_exit_to_user_mode+0x1d/0x40\n   do_syscall_64+0x48/0xc0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nIf kvm_tdp_mmu_zap_all() skips a gfn/SPTE but that SPTE is then zapped by\nkvm_tdp_mmu_put_root(), KVM triggers a use-after-free in the form of\nmarking a struct page as dirty/accessed after it has been put back on the\nfree list.  This directly triggers a WARN due to encountering a page with\npage_count() == 0, but it can also lead to data corruption and additional\nerrors in the kernel.\n\n  WARNING: CPU: 7 PID: 1995658 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:171\n  RIP: 0010:kvm_is_zone_device_pfn.part.0+0x9e/0xd0 [kvm]\n  Call Trace:\n   \u003cTASK\u003e\n   kvm_set_pfn_dirty+0x120/0x1d0 [kvm]\n   __handle_changed_spte+0x92e/0xca0 [kvm]\n   __handle_changed_spte+0x63c/0xca0 [kvm]\n   __handle_changed_spte+0x63c/0xca0 [kvm]\n   __handle_changed_spte+0x63c/0xca0 [kvm]\n   zap_gfn_range+0x549/0x620 [kvm]\n   kvm_tdp_mmu_put_root+0x1b6/0x270 [kvm]\n   mmu_free_root_page+0x219/0x2c0 [kvm]\n   kvm_mmu_free_roots+0x1b4/0x4e0 [kvm]\n   kvm_mmu_unload+0x1c/0xa0 [kvm]\n   kvm_arch_destroy_vm+0x1f2/0x5c0 [kvm]\n   kvm_put_kvm+0x3b1/0x8b0 [kvm]\n   kvm_vcpu_release+0x4e/0x70 [kvm]\n   __fput+0x1f7/0x8c0\n   task_work_run+0xf8/0x1a0\n   do_exit+0x97b/0x2230\n   do_group_exit+0xda/0x2a0\n   get_signal+0x3be/0x1e50\n   arch_do_signal_or_restart+0x244/0x17f0\n   exit_to_user_mode_prepare+0xcb/0x120\n   syscall_exit_to_user_mode+0x1d/0x40\n   do_syscall_64+0x4d/0x90\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nNote, the underlying bug existed even before commit 1af4a96025b3 (\"KVM:\nx86/mmu: Yield in TDU MMU iter even if no SPTES changed\") moved calls to\ntdp_mmu_iter_cond_resched() to the beginning of loops, as KVM could still\nincorrectly advance past a top-level entry when yielding on a lower-level\nentry.  But with respect to leaking shadow pages, the bug was introduced\nby yielding before processing the current gfn.\n\nAlternatively, tdp_mmu_iter_cond_resched() could simply fall through, or\ncallers could jump to their \"retry\" label.  The downside of that approach\nis that tdp_mmu_iter_cond_resched() _must_ be called before anything else\nin the loop, and there\u0027s no easy way to enfornce that requirement.\n\nIdeally, KVM would handling the cond_resched() fully within the iterator\nmacro (the code is actually quite clean) and avoid this entire class of\nbugs, but that is extremely difficult do wh\n---truncated---"
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              "value": "AV:L - The bug is reached via host KVM ioctls on /dev/kvm (create VM, populate TDP SPTEs, then zap on memslot changes or VM destroy), not via network packets or guest-only operations.\nAC:L - An attacker who creates a large guest memory map can reliably force tdp_mmu_iter_cond_resched() yields (need_resched/lock contention), and once a yield occurs during zap-all the skipped top-level SPTE is deterministic.\nPR:L - Opening /dev/kvm and creating VMs requires only local access granted by device permissions (typically kvm-group membership); the kernel path does not require CAP_SYS_ADMIN or real root.\nUI:N - Exploitation needs no victim action beyond the attacker\u2019s own KVM VM create/map/destroy (or memslot zap) sequence.\nS:U - This is host-userspace-to-host-kernel memory corruption in KVM\u2019s TDP MMU, not a guest-to-host escape across the VM isolation boundary.\nC:H - The flawed zap path can UAF freed struct pages (mark dirty/accessed after return to the freelist), which per UAF guidance enables arbitrary host memory disclosure primitives.\nI:H - The commit explicitly reports use-after-free leading to host data corruption when leftover SPTEs are later zapped against already-freed pages, enabling integrity compromise and further write primitives.\nA:H - The bug triggers kernel WARNs/oops paths and use-after-free behavior that can crash or hang the host during VM teardown or zap."
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              "version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69",
              "versionType": "git"
            },
            {
              "lessThan": "4373534a9850627a2695317944898eb1283a2db0",
              "status": "affected",
              "version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/scsi_error.c",
            "drivers/scsi/scsi_lib.c",
            "drivers/scsi/scsi_priv.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.149",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.210",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.149",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.77",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.16",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.7.4",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Move scsi_host_busy() out of host lock for waking up EH handler\n\nInside scsi_eh_wakeup(), scsi_host_busy() is called \u0026 checked with host\nlock every time for deciding if error handler kthread needs to be waken up.\n\nThis can be too heavy in case of recovery, such as:\n\n - N hardware queues\n\n - queue depth is M for each hardware queue\n\n - each scsi_host_busy() iterates over (N * M) tag/requests\n\nIf recovery is triggered in case that all requests are in-flight, each\nscsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called\nfor the last in-flight request, scsi_host_busy() has been run for (N * M -\n1) times, and request has been iterated for (N*M - 1) * (N * M) times.\n\nIf both N and M are big enough, hard lockup can be triggered on acquiring\nhost lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169).\n\nFix the issue by calling scsi_host_busy() outside the host lock. We don\u0027t\nneed the host lock for getting busy count because host the lock never\ncovers that.\n\n[mkp: Drop unnecessary \u0027busy\u0027 variables pointed out by Bart]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:01:04.897Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059"
        },
        {
          "url": "https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c"
        },
        {
          "url": "https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1"
        },
        {
          "url": "https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0"
        }
      ],
      "title": "scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26627",
    "datePublished": "2024-03-06T06:45:34.339Z",
    "dateReserved": "2024-02-19T14:20:24.135Z",
    "dateUpdated": "2026-05-11T20:01:04.897Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}