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

Vulnerability from cvelistv5 – Published: 2026-07-04 11:54 – Updated: 2026-08-19 16:28
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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()."
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              "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."
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    "dateReserved": "2026-06-09T07:44:35.400Z",
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    "redhat_vex": {
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      "cve": "CVE-2026-53361",
      "id": "CVE-2026-53361",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: af_unix: Set gc_in_progress to true in unix_gc()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53361.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-06T01:13:15Z",
      "cve": "CVE-2026-53361",
      "id": "CVE-2026-53361",
      "initial_release_date": "2026-07-05T01:58:42Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "264",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53361",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53361.json",
      "version": "5"
    }
  }
}



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