Medium [CVE-2026-74562] take nh->lock for f6i_list walks in replace check and notify
This medium-severity Red Hat Linux advisory covers CVE-2026-74562 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
A flaw was found in the Linux kernel's nexthop component. A race condition exists where internal lists are walked without proper locking during nexthop replacement and route deletion.
A local attacker could exploit this by concurrently manipulating IPv6 routes, leading to a use-after-free vulnerability. This could result in a system crash, causing a denial of service.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-366.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel.
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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