CVE-2026-99223
keys: make keyring indexes independent of kernel addresses
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: keys: make keyring indexes independent of kernel addresses KEYCTL_READ returns the serial numbers in a keyring in associative-array traversal order. The first word of the index is a public, deterministic hash of the type pointer, domain pointer and description. An unprivileged user can therefore insert keys with known descriptions, predict their order for each possible KASLR slide, and recover the kernel image address. On an x86-64 build with 16 MiB alignment, 45 user keys suffice to distinguish the candidate slides. Remove the addresses from the whole index, not just its first hash word. Assign each key type and domain a nonzero 64-bit ID and hash those IDs and the description with a once-initialized SipHash key. Use the full IDs in the later index chunks as well. Truncating or hashing the IDs there would lose the guarantee that distinct type/domain/description tuples have a differing index bit. Allocate IDs lazily since private key types need not be registered. Cache them in the index key so tree walks and copies of an existing index do not need to dereference a type descriptor that may have been unregistered. Keep the 32-bit chunk layout and diff_objects() bit offsets consistent, and retain the separate root slot for keyrings used by recursive search. The key comparison, permissions and userspace data format are unchanged; only the address-dependent in-memory ordering is replaced.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 9ebe824d55983c9f063a2c9ef1a08b29812d406f
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < e108b22999edbc6f431466baf6b2016c19b7ed31
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 9f084ef0beb68091e96ab96f0e95579aac8a77f9
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 8451d4a4c43127c3b9fdf9fc9ff3fea5539a61f9
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 13fc051269d670810d9e314061b61c6dd06116a0
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 61ac0585d9f4344d3dfb84b5edff1fee7d532897
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < 84f7c699f8d139f743c7dc11ef41d085690955bb
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < a113eba06bd1183c614d7994864d6e7054140cb9
- affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 – < de891c73c1cf41ac8de12c07fa2c84d6a912ad0c
- affected 3.13
- unaffected < 3.13
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.60 – ≤ 6.18.*
- unaffected 7.2.14 – ≤ 7.2.*
- unaffected 7.3.1 – ≤ 7.3.*
- unaffected 7.4-rc1 – ≤ *
References (9)
- https://git.kernel.org/stable/c/9ebe824d55983c9f063a2c9ef1a08b29812d406f (opens in a new tab)
- https://git.kernel.org/stable/c/e108b22999edbc6f431466baf6b2016c19b7ed31 (opens in a new tab)
- https://git.kernel.org/stable/c/9f084ef0beb68091e96ab96f0e95579aac8a77f9 (opens in a new tab)
- https://git.kernel.org/stable/c/8451d4a4c43127c3b9fdf9fc9ff3fea5539a61f9 (opens in a new tab)
- https://git.kernel.org/stable/c/13fc051269d670810d9e314061b61c6dd06116a0 (opens in a new tab)
- https://git.kernel.org/stable/c/61ac0585d9f4344d3dfb84b5edff1fee7d532897 (opens in a new tab)
- https://git.kernel.org/stable/c/84f7c699f8d139f743c7dc11ef41d085690955bb (opens in a new tab)
- https://git.kernel.org/stable/c/a113eba06bd1183c614d7994864d6e7054140cb9 (opens in a new tab)
- https://git.kernel.org/stable/c/de891c73c1cf41ac8de12c07fa2c84d6a912ad0c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2026-99223)Record last updated .