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EUVD-2026-344904

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:58

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": "2026-10-02T07:58:36.679625+00:00",
  "id": "EUVD-2026-344904"
}

CVE-2022-50373 (GCVE-0-2022-50373)

Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2026-08-05 08:58

Title

fs: dlm: fix race in lowcomms

Summary

In the Linux kernel, the following vulnerability has been resolved: fs: dlm: fix race in lowcomms This patch fixes a race between queue_work() in _dlm_lowcomms_commit_msg() and srcu_read_unlock(). The queue_work() can take the final reference of a dlm_msg and so msg->idx can contain garbage which is signaled by the following warning: [ 676.237050] ------------[ cut here ]------------ [ 676.237052] WARNING: CPU: 0 PID: 1060 at include/linux/srcu.h:189 dlm_lowcomms_commit_msg+0x41/0x50 [ 676.238945] Modules linked in: dlm_locktorture torture rpcsec_gss_krb5 intel_rapl_msr intel_rapl_common iTCO_wdt iTCO_vendor_support qxl kvm_intel drm_ttm_helper vmw_vsock_virtio_transport kvm vmw_vsock_virtio_transport_common ttm irqbypass crc32_pclmul joydev crc32c_intel serio_raw drm_kms_helper vsock virtio_scsi virtio_console virtio_balloon snd_pcm drm syscopyarea sysfillrect sysimgblt snd_timer fb_sys_fops i2c_i801 lpc_ich snd i2c_smbus soundcore pcspkr [ 676.244227] CPU: 0 PID: 1060 Comm: lock_torture_wr Not tainted 5.19.0-rc3+ #1546 [ 676.245216] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-2.module+el8.7.0+15506+033991b0 04/01/2014 [ 676.246460] RIP: 0010:dlm_lowcomms_commit_msg+0x41/0x50 [ 676.247132] Code: fe ff ff ff 75 24 48 c7 c6 bd 0f 49 bb 48 c7 c7 38 7c 01 bd e8 00 e7 ca ff 89 de 48 c7 c7 60 78 01 bd e8 42 3d cd ff 5b 5d c3 <0f> 0b eb d8 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 [ 676.249253] RSP: 0018:ffffa401c18ffc68 EFLAGS: 00010282 [ 676.249855] RAX: 0000000000000001 RBX: 00000000ffff8b76 RCX: 0000000000000006 [ 676.250713] RDX: 0000000000000000 RSI: ffffffffbccf3a10 RDI: ffffffffbcc7b62e [ 676.251610] RBP: ffffa401c18ffc70 R08: 0000000000000001 R09: 0000000000000001 [ 676.252481] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000005 [ 676.253421] R13: ffff8b76786ec370 R14: ffff8b76786ec370 R15: ffff8b76786ec480 [ 676.254257] FS: 0000000000000000(0000) GS:ffff8b7777800000(0000) knlGS:0000000000000000 [ 676.255239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 676.255897] CR2: 00005590205d88b8 CR3: 000000017656c003 CR4: 0000000000770ee0 [ 676.256734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 676.257567] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 676.258397] PKRU: 55555554 [ 676.258729] Call Trace: [ 676.259063] <TASK> [ 676.259354] dlm_midcomms_commit_mhandle+0xcc/0x110 [ 676.259964] queue_bast+0x8b/0xb0 [ 676.260423] grant_pending_locks+0x166/0x1b0 [ 676.261007] _unlock_lock+0x75/0x90 [ 676.261469] unlock_lock.isra.57+0x62/0xa0 [ 676.262009] dlm_unlock+0x21e/0x330 [ 676.262457] ? lock_torture_stats+0x80/0x80 [dlm_locktorture] [ 676.263183] torture_unlock+0x5a/0x90 [dlm_locktorture] [ 676.263815] ? preempt_count_sub+0xba/0x100 [ 676.264361] ? complete+0x1d/0x60 [ 676.264777] lock_torture_writer+0xb8/0x150 [dlm_locktorture] [ 676.265555] kthread+0x10a/0x130 [ 676.266007] ? kthread_complete_and_exit+0x20/0x20 [ 676.266616] ret_from_fork+0x22/0x30 [ 676.267097] </TASK> [ 676.267381] irq event stamp: 9579855 [ 676.267824] hardirqs last enabled at (9579863): [<ffffffffbb14e6f8>] __up_console_sem+0x58/0x60 [ 676.268896] hardirqs last disabled at (9579872): [<ffffffffbb14e6dd>] __up_console_sem+0x3d/0x60 [ 676.270008] softirqs last enabled at (9579798): [<ffffffffbc200349>] __do_softirq+0x349/0x4c7 [ 676.271438] softirqs last disabled at (9579897): [<ffffffffbb0d54c0>] irq_exit_rcu+0xb0/0xf0 [ 676.272796] ---[ end trace 0000000000000000 ]--- I reproduced this warning with dlm_locktorture test which is currently not upstream. However this patch fix the issue by make a additional refcount between dlm_lowcomms_new_msg() and dlm_lowcomms_commit_msg(). In case of the race the kref_put() in dlm_lowcomms_commit_msg() will be the final put.

Severity

9.8 (Critical)


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

4.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-14 18:36 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/27d3e646dd83bafd7…
https://git.kernel.org/stable/c/eb97e60a9eae632ff…
https://git.kernel.org/stable/c/de7fdff754bb4d01e…
https://git.kernel.org/stable/c/30ea3257e8766027c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b38bc9c2b3171f4411d80015ecb876bc6f9bcd26 , < 27d3e646dd83bafd7094890462eebfce3ac31e4a (git) Affected: b38bc9c2b3171f4411d80015ecb876bc6f9bcd26 , < eb97e60a9eae632ff9104a580dbc4fdc58dc23cb (git) Affected: b38bc9c2b3171f4411d80015ecb876bc6f9bcd26 , < de7fdff754bb4d01e38e19964c309b6df6a79472 (git) Affected: b38bc9c2b3171f4411d80015ecb876bc6f9bcd26 , < 30ea3257e8766027c4d8d609dcbd256ff9a76073 (git) Affected: 7ae861bbfa0f69bd36bdff47f9755ad67a2bd219 (git) Affected: 5.13.2 , < 5.14 (semver)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.75 , ≤ 5.15.* (semver) Unaffected: 5.19.17 , ≤ 5.19.* (semver) Unaffected: 6.0.3 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 4.7,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-50373",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T18:36:47.932587Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T18:43:00.519Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/dlm/lowcomms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "27d3e646dd83bafd7094890462eebfce3ac31e4a",
              "status": "affected",
              "version": "b38bc9c2b3171f4411d80015ecb876bc6f9bcd26",
              "versionType": "git"
            },
            {
              "lessThan": "eb97e60a9eae632ff9104a580dbc4fdc58dc23cb",
              "status": "affected",
              "version": "b38bc9c2b3171f4411d80015ecb876bc6f9bcd26",
              "versionType": "git"
            },
            {
              "lessThan": "de7fdff754bb4d01e38e19964c309b6df6a79472",
              "status": "affected",
              "version": "b38bc9c2b3171f4411d80015ecb876bc6f9bcd26",
              "versionType": "git"
            },
            {
              "lessThan": "30ea3257e8766027c4d8d609dcbd256ff9a76073",
              "status": "affected",
              "version": "b38bc9c2b3171f4411d80015ecb876bc6f9bcd26",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7ae861bbfa0f69bd36bdff47f9755ad67a2bd219",
              "versionType": "git"
            },
            {
              "lessThan": "5.14",
              "status": "affected",
              "version": "5.13.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/dlm/lowcomms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.75",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.13.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: dlm: fix race in lowcomms\n\nThis patch fixes a race between queue_work() in\n_dlm_lowcomms_commit_msg() and srcu_read_unlock(). The queue_work() can\ntake the final reference of a dlm_msg and so msg-\u003eidx can contain\ngarbage which is signaled by the following warning:\n\n[  676.237050] ------------[ cut here ]------------\n[  676.237052] WARNING: CPU: 0 PID: 1060 at include/linux/srcu.h:189 dlm_lowcomms_commit_msg+0x41/0x50\n[  676.238945] Modules linked in: dlm_locktorture torture rpcsec_gss_krb5 intel_rapl_msr intel_rapl_common iTCO_wdt iTCO_vendor_support qxl kvm_intel drm_ttm_helper vmw_vsock_virtio_transport kvm vmw_vsock_virtio_transport_common ttm irqbypass crc32_pclmul joydev crc32c_intel serio_raw drm_kms_helper vsock virtio_scsi virtio_console virtio_balloon snd_pcm drm syscopyarea sysfillrect sysimgblt snd_timer fb_sys_fops i2c_i801 lpc_ich snd i2c_smbus soundcore pcspkr\n[  676.244227] CPU: 0 PID: 1060 Comm: lock_torture_wr Not tainted 5.19.0-rc3+ #1546\n[  676.245216] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-2.module+el8.7.0+15506+033991b0 04/01/2014\n[  676.246460] RIP: 0010:dlm_lowcomms_commit_msg+0x41/0x50\n[  676.247132] Code: fe ff ff ff 75 24 48 c7 c6 bd 0f 49 bb 48 c7 c7 38 7c 01 bd e8 00 e7 ca ff 89 de 48 c7 c7 60 78 01 bd e8 42 3d cd ff 5b 5d c3 \u003c0f\u003e 0b eb d8 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48\n[  676.249253] RSP: 0018:ffffa401c18ffc68 EFLAGS: 00010282\n[  676.249855] RAX: 0000000000000001 RBX: 00000000ffff8b76 RCX: 0000000000000006\n[  676.250713] RDX: 0000000000000000 RSI: ffffffffbccf3a10 RDI: ffffffffbcc7b62e\n[  676.251610] RBP: ffffa401c18ffc70 R08: 0000000000000001 R09: 0000000000000001\n[  676.252481] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000005\n[  676.253421] R13: ffff8b76786ec370 R14: ffff8b76786ec370 R15: ffff8b76786ec480\n[  676.254257] FS:  0000000000000000(0000) GS:ffff8b7777800000(0000) knlGS:0000000000000000\n[  676.255239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  676.255897] CR2: 00005590205d88b8 CR3: 000000017656c003 CR4: 0000000000770ee0\n[  676.256734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  676.257567] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  676.258397] PKRU: 55555554\n[  676.258729] Call Trace:\n[  676.259063]  \u003cTASK\u003e\n[  676.259354]  dlm_midcomms_commit_mhandle+0xcc/0x110\n[  676.259964]  queue_bast+0x8b/0xb0\n[  676.260423]  grant_pending_locks+0x166/0x1b0\n[  676.261007]  _unlock_lock+0x75/0x90\n[  676.261469]  unlock_lock.isra.57+0x62/0xa0\n[  676.262009]  dlm_unlock+0x21e/0x330\n[  676.262457]  ? lock_torture_stats+0x80/0x80 [dlm_locktorture]\n[  676.263183]  torture_unlock+0x5a/0x90 [dlm_locktorture]\n[  676.263815]  ? preempt_count_sub+0xba/0x100\n[  676.264361]  ? complete+0x1d/0x60\n[  676.264777]  lock_torture_writer+0xb8/0x150 [dlm_locktorture]\n[  676.265555]  kthread+0x10a/0x130\n[  676.266007]  ? kthread_complete_and_exit+0x20/0x20\n[  676.266616]  ret_from_fork+0x22/0x30\n[  676.267097]  \u003c/TASK\u003e\n[  676.267381] irq event stamp: 9579855\n[  676.267824] hardirqs last  enabled at (9579863): [\u003cffffffffbb14e6f8\u003e] __up_console_sem+0x58/0x60\n[  676.268896] hardirqs last disabled at (9579872): [\u003cffffffffbb14e6dd\u003e] __up_console_sem+0x3d/0x60\n[  676.270008] softirqs last  enabled at (9579798): [\u003cffffffffbc200349\u003e] __do_softirq+0x349/0x4c7\n[  676.271438] softirqs last disabled at (9579897): [\u003cffffffffbb0d54c0\u003e] irq_exit_rcu+0xb0/0xf0\n[  676.272796] ---[ end trace 0000000000000000 ]---\n\nI reproduced this warning with dlm_locktorture test which is currently\nnot upstream. However this patch fix the issue by make a additional\nrefcount between dlm_lowcomms_new_msg() and dlm_lowcomms_commit_msg().\nIn case of the race the kref_put() in dlm_lowcomms_commit_msg() will be\nthe final put."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The race is hit when the local node commits outbound DLM messages (e.g. BASTs from grant_pending_locks), which remote peers induce by sending lock/unlock traffic over the DLM TCP/SCTP transport on port 21064; that is the same network-reachable midcomms/lowcomms path scored AV:N for related DLM CVEs.\nAC:L - A peer can drive both sides by flooding concurrent lock operations so many commit_msg calls race with the send workqueue that frees dlm_msg; the locktorture repro shows this is reliably hittable under attacker-controlled load rather than a one-shot environmental fluke.\nPR:N - DLM lowcomms has no authentication or TLS in the affected versions\u2014only an IP-to-nodeid allowlist\u2014so a cluster peer, compromised node, or address-spoofing attacker needs no account or privilege on the victim.\nUI:N - Crafted or concurrent peer lock messages are processed by DLM receive/send workqueues on an already-running cluster with no victim user action required.\nS:U - Corruption stays in host kernel memory (freed dlm_msg and SRCU per-CPU counters) within one security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free of a kmem_cache-backed dlm_msg; after free, msg-\u003eidx and related fields can be groomed/reused so subsequent reads of the stale object yield an attacker-steerable kernel read primitive.\nI:H - srcu_read_unlock() uses the freed msg-\u003eidx in this_cpu_inc(srcu_unlock_count[idx]) on a size-2 array, giving an out-of-bounds write when idx is garbage, which is exploitable for memory corruption and control-flow hijack as with the related midcomms UAF.\nA:H - The UAF produces WARN/oops paths (as in the reported srcu.h warning) and corrupted SRCU accounting that can panic, hang DLM, or take down the clustered filesystem node."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:28.255Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/27d3e646dd83bafd7094890462eebfce3ac31e4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb97e60a9eae632ff9104a580dbc4fdc58dc23cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/de7fdff754bb4d01e38e19964c309b6df6a79472"
        },
        {
          "url": "https://git.kernel.org/stable/c/30ea3257e8766027c4d8d609dcbd256ff9a76073"
        }
      ],
      "title": "fs: dlm: fix race in lowcomms",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50373",
    "datePublished": "2025-09-17T14:56:28.282Z",
    "dateReserved": "2025-09-17T14:53:06.995Z",
    "dateUpdated": "2026-08-05T08:58:28.255Z",
    "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.
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EUVD-2026-344904

CVE-2022-50373 (GCVE-0-2022-50373)

Tags

Sightings

Nomenclature

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