{"schema":"threatline.record/2","record":{"id":"CVE-2026-98655","aliases":[],"summary":"perf: Require kernel access for text poke events","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"e17d43b93e544f5016c0251d2074c15568d5d963","lessThan":"8c38cb055f6a9651198780e4e4d5283de4039f79","status":"affected","versionType":"git"},{"version":"e17d43b93e544f5016c0251d2074c15568d5d963","lessThan":"8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7","status":"affected","versionType":"git"},{"version":"e17d43b93e544f5016c0251d2074c15568d5d963","lessThan":"e506333d1b9f42f1e402acebf1283af3c44a3809","status":"affected","versionType":"git"},{"version":"e17d43b93e544f5016c0251d2074c15568d5d963","lessThan":"677d0b51ac1a0db55d768c4c6399210b3de0795b","status":"affected","versionType":"git"},{"version":"e17d43b93e544f5016c0251d2074c15568d5d963","lessThan":"357e8a77a501d96c9517f01f4a211eed5e9c9184","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.9","status":"affected"},{"version":"0","lessThan":"5.9","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8c38cb055f6a9651198780e4e4d5283de4039f79","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"677d0b51ac1a0db55d768c4c6399210b3de0795b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","source_modified_at":"2026-10-21T12:55:22.740Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"357e8a77a501d96c9517f01f4a211eed5e9c9184","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0018,"percentile":0.07244,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:44:05.722Z","modified_at":"2026-10-21T12:55:22.740Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:55:22.740Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98655","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:55:22.740Z","content_hash":"31dbd49739ba2e768db16327671665fd3903d623168aad328867cfdec1d1d3db"}}