High [CVE-2026-52920] fix strict mode inbound policy matching
This high-severity Red Hat Linux advisory covers CVE-2026-52920 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_policy: fix strict mode inbound policy matching match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout.
Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently. A flaw was found in the Linux kernel's netfilter component, which is responsible for network packet filtering.
This vulnerability, located in the `xt_policy` module, involves an error in how strict inbound network policies are matched. This could allow an attacker to bypass established security rules, potentially leading to unauthorized network access or unintended exposure of services.
The flaw could compromise the effectiveness of network traffic control. 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-551. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:59723.
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 · high-confidence parse· fetched 13 days ago·verify at source
- kernel-0:5.14.0-687.42.1.el9_8
- RHSA-2026:59723
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:5.14.0-687.42.1.el9_8, RHSA-2026:59723. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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