Bug 2502248 (CVE-2026-63824)

Summary: CVE-2026-63824 kernel: KEYS: fix overflow in keyctl_pkey_params_get_2()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `keyctl_pkey_params_get_2()` function within the KEYS subsystem. The vulnerability arises from an incorrect calculation of the internal output buffer's length, which can lead to a buffer overflow when a user-provided buffer is too small. This flaw could allow a local attacker to corrupt memory, potentially leading to a denial of service or other unspecified impacts.
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Description OSIDB Bzimport 2026-07-19 13:03:56 UTC 
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.
Comment 1 Keith Grant 2026-07-20 16:02:56 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071906-CVE-2026-63824-6a2f@gregkh/T