CVE-2026-97587perf: RISC-V: store available counter mask as bitmap
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No exploitation reported and no EPSS estimate yet.
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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. [pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e9991434596f5373dfd75857b445eb92a9253c56 before 143668c424772979a45118dc9cc9c2c13a35f41d; from e9991434596f5373dfd75857b445eb92a9253c56 before 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957; from e9991434596f5373dfd75857b445eb92a9253c56 before e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb; from e9991434596f5373dfd75857b445eb92a9253c56 before 6809da6e9c08ccc9a09cb0a48c61471679274aaa | CNA record |
References
- https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d
- https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957
- https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb
- https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.