{"api_version":"1","generated_at":"2026-09-26T20:43:41+00:00","cve":"CVE-2026-97587","urls":{"html":"https://cve.report/CVE-2026-97587","api":"https://cve.report/api/cve/CVE-2026-97587.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97587","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97587"},"summary":{"title":"perf: RISC-V: store available counter mask as bitmap","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]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:09","updated_at":"2026-09-25 11:17:09"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957","name":"https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d","name":"https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb","name":"https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa","name":"https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97587","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97587","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e9991434596f5373dfd75857b445eb92a9253c56 143668c424772979a45118dc9cc9c2c13a35f41d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e9991434596f5373dfd75857b445eb92a9253c56 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e9991434596f5373dfd75857b445eb92a9253c56 e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e9991434596f5373dfd75857b445eb92a9253c56 6809da6e9c08ccc9a09cb0a48c61471679274aaa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/perf/riscv_pmu_legacy.c","drivers/perf/riscv_pmu_sbi.c","include/linux/perf/riscv_pmu.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"143668c424772979a45118dc9cc9c2c13a35f41d","status":"affected","version":"e9991434596f5373dfd75857b445eb92a9253c56","versionType":"git"},{"lessThan":"9bec7beaed074bcae4181fde9ff9dfbe4e7b0957","status":"affected","version":"e9991434596f5373dfd75857b445eb92a9253c56","versionType":"git"},{"lessThan":"e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb","status":"affected","version":"e9991434596f5373dfd75857b445eb92a9253c56","versionType":"git"},{"lessThan":"6809da6e9c08ccc9a09cb0a48c61471679274aaa","status":"affected","version":"e9991434596f5373dfd75857b445eb92a9253c56","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/perf/riscv_pmu_legacy.c","drivers/perf/riscv_pmu_sbi.c","include/linux/perf/riscv_pmu.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.18"},{"lessThan":"5.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"5.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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]"}],"providerMetadata":{"dateUpdated":"2026-09-25T10:22:06.177Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d"},{"url":"https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957"},{"url":"https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb"},{"url":"https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa"}],"title":"perf: RISC-V: store available counter mask as bitmap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97587","datePublished":"2026-09-25T10:22:06.177Z","dateReserved":"2026-09-24T16:01:01.157Z","dateUpdated":"2026-09-25T10:22:06.177Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:09","lastModifiedDate":"2026-09-25 11:17:09","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97587","Ordinal":"1","Title":"perf: RISC-V: store available counter mask as bitmap","CVE":"CVE-2026-97587","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97587","Ordinal":"1","NoteData":"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]","Type":"Description","Title":"perf: RISC-V: store available counter mask as bitmap"}]}}}