CVE-2026-97587perf: RISC-V: store available counter mask as bitmap
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: perf: RISC-V: store available counter mask as bitmap The available-counter mask was a single unsigned long, but iteration uses RISCV_MAX_COUNTERS, which is 64. On RV32 that reads past the object. Filling with an unsigned-long bit at index 32 and above is also wrong. Use DECLARE_BITMAP and set_bit/bitmap helpers. Walk each bitmap word into CFG_MATCH when checking events, when allocating an index, and when stopping all counters. Set the counter base to i times BITS_PER_LONG. Share the CFG_MATCH ecall through a small helper so the 32-bit argument split is not duplicated. On qemu-system-riscv32 the probe bitmap has bits above XLEN set, so the first word alone is not enough. [[email protected]: updated to apply; fixed checkpatch.pl issues]
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 35 days later
· 35 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < 433249a4de52ecda40ffa9c466cec1312e62826f
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < 5a1b6379eed5b13eac0228b605b0bed988e547e9
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < 143668c424772979a45118dc9cc9c2c13a35f41d
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb
- affected e9991434596f5373dfd75857b445eb92a9253c56 – < 6809da6e9c08ccc9a09cb0a48c61471679274aaa
- affected 5.18
- unaffected < 5.18
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/433249a4de52ecda40ffa9c466cec1312e62826f (opens in a new tab)
- https://git.kernel.org/stable/c/5a1b6379eed5b13eac0228b605b0bed988e547e9 (opens in a new tab)
- https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d (opens in a new tab)
- https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957 (opens in a new tab)
- https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb (opens in a new tab)
- https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa (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)
- EUVD EUVD-2026-86895 (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)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-97587)Record last updated .