High [CVE-2026-63824] fix overflow in keyctl_pkey_params_get_2
This high-severity Red Hat Linux advisory covers CVE-2026-63824 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
In the Linux kernel, the following vulnerability has been resolved: KEYS: fix overflow in keyctl_pkey_params_get_2() The length for the internal output buffer is calculated incorrectly, which can result overflow when a too small buffer is provided.
Fix the bug by allocating internal output with the size of the maximum length of the cryptographic primitive instead of caller provided size. A flaw was found in the Linux kernel's `keyctl_pkey_params_get_2()` function within the KEYS subsystem.
This flaw could allow a local attacker to corrupt memory, potentially leading to a denial of service or other unspecified impacts.
The keyctl_pkey_params_get_2() function calculates the length of the internal output buffer used for keyctl() public-key operations incorrectly, so a buffer overflow can occur when a caller supplies a buffer that is too small for the cryptographic operation being requested.
Red Hat Product Security scores this flaw CVSS 3.1 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting a higher attack complexity than the upstream CVE record score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Fixes are being pursued for the affected Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, and Red Hat In-Vehicle OS 2 kernel streams.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
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 7 days ago·verify at source
- kernel-0:6.12.0-211.51.1.el10_2
- kernel-0:5.14.0-687.44.1.el9_8
- RHSA-2026:63128
- RHSA-2026:63129
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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