High [CVE-2026-74714] Fix use-after-free in bpf_iter_tcp_established_batch
This high-severity Red Hat Linux advisory covers CVE-2026-74714 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel. A use-after-free vulnerability exists in the `bpf_iter_tcp_established_batch()` function.
This flaw occurs because the `sock_hold()` function is used on a `request_sock` object whose reference count can be zero, leading to an incorrect reference count. A local attacker can trigger this by performing specific network operations while reading an iterator/TCP link, potentially leading to 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-911.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6.
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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