High [CVE-2026-74715] Fix netns reference imbalance in conntrack kfuncs
This high-severity Red Hat Linux advisory covers CVE-2026-74715 affecting Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
A flaw was found in the kernel. A reference imbalance vulnerability exists in the Berkeley Packet Filter (BPF) conntrack kfuncs.
This occurs when the 'opts' argument, which can point to a shared map value, has its network namespace identifier (netns_id) read separately during reference acquisition and release. A concurrent update can lead to an unmatched release, which can destroy a live network namespace.
This issue can result in a kernel panic and a system crash, effectively causing a Denial of Service. 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-476. 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 1 hour 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 1 hour 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 1 hour ago·verify at source
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