High [CVE-2026-72183] Fix LANDLOCK_SCOPE_SIGNAL bypass on the SIGIO path
This high-severity Red Hat Linux advisory covers CVE-2026-72183 affecting Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
A flaw was found in the Linux kernel's Landlock security module. A sandboxed process can bypass the intended signal isolation provided by LANDLOCK_SCOPE_SIGNAL.
By manipulating file descriptors with specific `fcntl` calls and asynchronous I/O (SIGIO) delivery, a local attacker can send signals, such as a kill signal, to processes outside its Landlock domain. This could lead to a denial of service or unauthorized process termination of critical system processes.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-501.
Affected Red Hat products: Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
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