Vulnerability-Lookup

GHSA-H72J-P4F7-VRCJ

Vulnerability from github – Published: 2026-07-04 12:30 – Updated: 2026-08-19 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

af_unix: Set gc_in_progress to true in unix_gc().

Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running:

Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() - if (!gc_in_progress)- if (!gc_in_progress) |- gc_in_progress = true | - queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ...- queue_work() | | - gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ |- gc_in_progress = false

unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK.

Let's set gc_in_progress to true in unix_gc().

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53361"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-04T12:17:02Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Set gc_in_progress to true in unix_gc().\n\nIgor Ushakov reported that unix_gc() could run with gc_in_progress\nbeing false if the work is scheduled while running:\n\n  Thread 1         Thread 2                     Thread 3\n  --------         --------                     --------\n                   unix_schedule_gc()           unix_schedule_gc()\n                   `- if (!gc_in_progress)      `- if (!gc_in_progress)\n                      |- gc_in_progress = true     |\n                      `- queue_work()              |\n  unix_gc() \u003c----------------/                     |\n  |                                                |- gc_in_progress = true\n  ...                                              `- queue_work()\n  |                                                       |\n  `- gc_in_progress = false                               |\n                                                          |\n  unix_gc() \u003c---------------------------------------------\u0027\n  |\n  ... /* gc_in_progress == false */\n  |\n  `- gc_in_progress = false\n\nunix_peek_fpl() relies on gc_in_progress not to confuse GC\nby MSG_PEEK.\n\nLet\u0027s set gc_in_progress to true in unix_gc().",
  "id": "GHSA-h72j-p4f7-vrcj",
  "modified": "2026-08-19T18:31:59Z",
  "published": "2026-07-04T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53361"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53361 (GCVE-0-2026-53361)

Vulnerability from cvelistv5 – Published: 2026-07-04 11:54 – Updated: 2026-08-19 16:28

Title

af_unix: Set gc_in_progress to true in unix_gc().

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running: Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() `- if (!gc_in_progress) `- if (!gc_in_progress) |- gc_in_progress = true | `- queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ... `- queue_work() | | `- gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ | `- gc_in_progress = false unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK. Let's set gc_in_progress to true in unix_gc().

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/20aa894d475bd8086…
https://git.kernel.org/stable/c/82c17e13d404f686e…
https://git.kernel.org/stable/c/591f1ac217428a6d2…
https://git.kernel.org/stable/c/0cfa78c050662784f…
https://git.kernel.org/stable/c/d82ba05263c69fa24…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5 , < 20aa894d475bd8086b25c1113ec4ca70f70c7a98 (git) Affected: 328840c93bd6a4871dd10908d01b41eab83eb8e2 , < 82c17e13d404f686e164590483fd6c1abaa675d0 (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < 591f1ac217428a6d2b32a8ac14aac0fab44f155a (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < 0cfa78c050662784fc8e3ab26dbfd1dc632b2082 (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < d82ba05263c69fa2437fe93e4e561cc40f4c03af (git) Affected: 6.1.141 , < 6.1.183 (semver) Affected: 6.6.93 , < 6.6.144 (semver)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/unix/garbage.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "20aa894d475bd8086b25c1113ec4ca70f70c7a98",
              "status": "affected",
              "version": "ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5",
              "versionType": "git"
            },
            {
              "lessThan": "82c17e13d404f686e164590483fd6c1abaa675d0",
              "status": "affected",
              "version": "328840c93bd6a4871dd10908d01b41eab83eb8e2",
              "versionType": "git"
            },
            {
              "lessThan": "591f1ac217428a6d2b32a8ac14aac0fab44f155a",
              "status": "affected",
              "version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec",
              "versionType": "git"
            },
            {
              "lessThan": "0cfa78c050662784fc8e3ab26dbfd1dc632b2082",
              "status": "affected",
              "version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec",
              "versionType": "git"
            },
            {
              "lessThan": "d82ba05263c69fa2437fe93e4e561cc40f4c03af",
              "status": "affected",
              "version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.183",
              "status": "affected",
              "version": "6.1.141",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.144",
              "status": "affected",
              "version": "6.6.93",
              "versionType": "semver"
            }
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
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              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "6.1.141",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "6.6.93",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.9",
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                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Set gc_in_progress to true in unix_gc().\n\nIgor Ushakov reported that unix_gc() could run with gc_in_progress\nbeing false if the work is scheduled while running:\n\n  Thread 1         Thread 2                     Thread 3\n  --------         --------                     --------\n                   unix_schedule_gc()           unix_schedule_gc()\n                   `- if (!gc_in_progress)      `- if (!gc_in_progress)\n                      |- gc_in_progress = true     |\n                      `- queue_work()              |\n  unix_gc() \u003c----------------/                     |\n  |                                                |- gc_in_progress = true\n  ...                                              `- queue_work()\n  |                                                       |\n  `- gc_in_progress = false                               |\n                                                          |\n  unix_gc() \u003c---------------------------------------------\u0027\n  |\n  ... /* gc_in_progress == false */\n  |\n  `- gc_in_progress = false\n\nunix_peek_fpl() relies on gc_in_progress not to confuse GC\nby MSG_PEEK.\n\nLet\u0027s set gc_in_progress to true in unix_gc()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable AF_UNIX garbage-collection path is reached through local socket syscalls such as socketpair(), sendmsg() with SCM_RIGHTS, recvmsg(MSG_PEEK), and close(). It is not reachable directly from network packets.\nAC:L - Although this is a race, the attacker can control the relevant operations by creating AF_UNIX FD cycles, issuing concurrent GC-triggering sends, peeking, and closing sockets. No victim timing or external condition is required beyond scheduler interleaving.\nPR:L - The path is available to an unprivileged local user through ordinary AF_UNIX sockets and SCM_RIGHTS; there is no capability check for socket creation, FD passing, or MSG_PEEK. It still requires local code execution, so privileges are Low rather than None.\nUI:N - No victim interaction is required once the local attacker can run code. The attacker can create the sockets, pass FDs, trigger GC, and race MSG_PEEK independently.\nS:U - The impact remains within the kernel/local IPC security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:N - The bug causes stale GC liveness decisions and purging of live AF_UNIX receive queues, but I did not find a new arbitrary read or unintended disclosure primitive. MSG_PEEK-visible descriptors are already exposed to the receiving endpoint by design.\nI:H - The race can make GC incorrectly collect a live AF_UNIX SCC and purge live receive queues, dropping queued data and SCM_RIGHTS file descriptors. That is unauthorized corruption/destruction of kernel-maintained IPC state, so integrity impact is High.\nA:H - The attacker can repeatedly cause live AF_UNIX sockets to lose queued messages and passed FDs, breaking IPC semantics and potentially denying service to affected local components. Under the required higher-severity rule, this supports High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:28:08.836Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98"
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          "url": "https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082"
        },
        {
          "url": "https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af"
        }
      ],
      "title": "af_unix: Set gc_in_progress to true in unix_gc().",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53361",
    "datePublished": "2026-07-04T11:54:52.543Z",
    "dateReserved": "2026-06-09T07:44:35.400Z",
    "dateUpdated": "2026-08-19T16:28:08.836Z",
    "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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GHSA-H72J-P4F7-VRCJ

CVE-2026-53361 (GCVE-0-2026-53361)

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