Medium [CVE-2026-72458] fix NULL pointer dereference in unpack_pdb
This medium-severity Red Hat Linux advisory covers CVE-2026-72458.
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Summary
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix NULL pointer dereference in unpack_pdb pdb->dfa could be NULL if unpack_dfa fails, causing a NULL pointer dereference. A flaw was found in the Linux kernel's Apparmor security module.
This vulnerability occurs in the `unpack_pdb` function, where it does not correctly handle a null pointer if a preceding operation, `unpack_dfa`, fails. This oversight can lead to a NULL pointer dereference, which typically results in a system crash and a Denial of Service (DoS) for the affected system.
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-476.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
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 25 days 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 25 days 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 25 days ago·verify at source
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