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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-97587

perf: RISC-V: store available counter mask as bitmap

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Status
Published
Published
Updated
Assigning organization
Linux

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. [pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e9991434596f5373dfd75857b445eb92a9253c56 to < 5a1b6379eed5b13eac0228b605b0bed988e547e9affected
  • e9991434596f5373dfd75857b445eb92a9253c56 to < 143668c424772979a45118dc9cc9c2c13a35f41daffected
  • e9991434596f5373dfd75857b445eb92a9253c56 to < 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957affected
  • e9991434596f5373dfd75857b445eb92a9253c56 to < e5481db31f4654e9a1254d5d467d9b1ff2f8b1cbaffected
  • e9991434596f5373dfd75857b445eb92a9253c56 to < 6809da6e9c08ccc9a09cb0a48c61471679274aaaaffected

Linux Linux

Default version status: affected

  • 5.18affected
  • 0 to < 5.18unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References