perf: RISC-V: store available counter mask as bitmap
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]
CVE-2026-97587
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97587
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e9991434596f5373dfd75857b445eb92a9253c56",
"lessThan": "5a1b6379eed5b13eac0228b605b0bed988e547e9",
"versionType": "git"
},
{
"status": "affected",
"version": "e9991434596f5373dfd75857b445eb92a9253c56",
"lessThan": "143668c424772979a45118dc9cc9c2c13a35f41d",
"versionType": "git"
},
{
"status": "affected",
"version": "e9991434596f5373dfd75857b445eb92a9253c56",
"lessThan": "9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
"versionType": "git"
},
{
"status": "affected",
"version": "e9991434596f5373dfd75857b445eb92a9253c56",
"lessThan": "e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
"versionType": "git"
},
{
"status": "affected",
"version": "e9991434596f5373dfd75857b445eb92a9253c56",
"lessThan": "6809da6e9c08ccc9a09cb0a48c61471679274aaa",
"versionType": "git"
}
],
"programFiles": [
"drivers/perf/riscv_pmu_legacy.c",
"drivers/perf/riscv_pmu_sbi.c",
"include/linux/perf/riscv_pmu.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/perf/riscv_pmu_legacy.c",
"drivers/perf/riscv_pmu_sbi.c",
"include/linux/perf/riscv_pmu.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97587
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48789 · Revision 1
- Added to Heist Feed
- Publisher date