CVE-2026-74567
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the keys subsystem has an out-of-bounds read vulnerability in keyring_get_key_chunk(). For description-level chunks, the read pointer is advanced by level * sizeof(long) past the inline prefix but only the prefix is bounds-checked, allowing reads past the allocated memory for long key descriptions.
Risk Assessment
An unprivileged user can trigger an out-of-bounds read via add_key(2) with crafted keys, potentially leading to information disclosure or system crash (KASAN reports slab-out-of-bounds).
Recommendation
Apply the Linux kernel patch that computes the full byte offset and bounds-checks the description before reading. Update your system to a kernel version containing this fix.
Original NVD description (English source)
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.