What’s Vulnerable › Vulnerabilities

CVE-2026-98867: dm-pcache: bound the logical key offset from persistent memory

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: bound the logical key offset from persistent memory cache_key_decode() takes a key's logical off from the cache device and later indexes req_key_tree->subtrees[] by it in get_subtree(). An off past the device forms a subtree pointer outside the array, which rb_insert() writes through during replay. Reject a key of zero length, or whose off+len (computed in 64 bits) exceeds the device size, before it is used.

Affected products

• Linux kernel: 6.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/10449703200076980704894c3d68d6796182371b
• https://git.kernel.org/stable/c/3d5a87cb909c1f375f08065b20123fa5db5958d8
• https://git.kernel.org/stable/c/97fc4b53dbe4a983fdf093243067fa6a64562307

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