High [CVE-2026-72427] Fix effective prog array index with BPF_F_PREORDER
This high-severity Red Hat Linux advisory covers CVE-2026-72427 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) cgroup program handling. Incorrect indexing in the `replace_effective_prog()` and `purge_effective_progs()` functions, particularly when `BPF_F_PREORDER` programs are active, can lead to memory corruption.
This issue can result in overwriting incorrect memory slots or a use-after-free condition, where the system attempts to access memory that has already been deallocated. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; 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 57 minutes 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 57 minutes 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 57 minutes ago·verify at source
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