High [CVE-2026-53361] Set gc_in_progress to true in unix_gc
This high-severity Red Hat Linux advisory covers CVE-2026-53361 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat package: kernel.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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.
A race condition exists within the `unix_gc()` garbage collection function where the `gc_in_progress` flag may not be correctly set. This could lead to `unix_peek_fpl()` misinterpreting garbage collection status when handling `MSG_PEEK` operations, potentially causing unexpected behavior or information disclosure to a local attacker.
Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-366.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support.
Affected products named by the advisory: Red Hat package: kernel.
Is CVE-2026-53361 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53361 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-53361?
Upgrade to a fixed release named by Red Hat:
- kernel-0:6.12.0-211.55.1.el10_2
- kernel-0:6.12.0-55.102.1.el10_0
- RHSA-2026:67471
- RHSA-2026:62609
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- kernel-0:6.12.0-211.55.1.el10_2
- kernel-0:6.12.0-55.102.1.el10_0
- RHSA-2026:67471
- RHSA-2026:62609
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.55.1.el10_2, kernel-0:6.12.0-55.102.1.el10_0, RHSA-2026:67471, RHSA-2026:62609. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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