{"id":"CVE-2026-97587","published":"2026-09-25T11:17:09.880","lastModified":"2026-09-25T11:17:09.880","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: RISC-V: store available counter mask as bitmap\n\nThe available-counter mask was a single unsigned long, but iteration\nuses RISCV_MAX_COUNTERS, which is 64. On RV32 that reads past the object.\nFilling with an unsigned-long bit at index 32 and above is also wrong.\n\nUse DECLARE_BITMAP and set_bit/bitmap helpers. Walk each bitmap word\ninto CFG_MATCH when checking events, when allocating an index, and when\nstopping all counters. Set the counter base to i times BITS_PER_LONG.\nShare the CFG_MATCH ecall through a small helper so the 32-bit argument\nsplit is not duplicated. On qemu-system-riscv32 the probe bitmap has bits\nabove XLEN set, so the first word alone is not enough.\n\n[pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d","tags":[]},{"url":"https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa","tags":[]},{"url":"https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957","tags":[]},{"url":"https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}