CVE-2026-74567
Received Received - Intake

BaseFortify

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: keys: fix out-of-bounds read in keyring_get_key_chunk() For description-level chunks keyring_get_key_chunk() advances the read pointer by level * sizeof(long) past the inline prefix but only bounds-checks the prefix, so a long enough key description is read past its kmemdup(desc, desc_len + 1) allocation. Compute the full byte offset and bounds-check the description against it before reading. The walk only reaches a description-level chunk when two keys collide through the hash, x, type and domain_tag chunks, so this is reached from an unprivileged add_key(2) with a crafted pair of same-type keys whose index hashes collide; KASAN reports a slab-out-of-bounds read.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74567
EUVD
EUVD-2026-59632

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability where a function called keyring_get_key_chunk() reads past the allocated memory when processing key descriptions. It happens because the function calculates an offset incorrectly and only checks the prefix length, not the full description length. This can lead to reading out-of-bounds memory.

Detection Guidance

This vulnerability is specific to the Linux kernel and can be detected by checking the kernel version against patched versions. Use 'uname -r' to check your kernel version and compare it with the fixed version mentioned in the CVE advisory.

Impact Analysis

An attacker with local access could exploit this to read sensitive kernel memory, potentially leaking passwords, encryption keys, or other secrets. It requires creating two specially crafted keys that collide in the hash, which is possible from an unprivileged user context.

Mitigation Strategies

Immediately update your Linux kernel to the latest stable version that includes the fix for this vulnerability. If updating is not immediately possible, restrict unprivileged users from using the add_key system call to prevent exploitation.

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