{"id":"CVE-2026-98937","state":"PUBLISHED","title":"perf/core: Check kernel access when kernel callchains are requested","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Check kernel access when kernel callchains are requested\n\nperf_event_open() currently gates perf_allow_kernel() only on\n!attr.exclude_kernel.\n\nHowever, users can still request kernel callchain collection with\nattr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1.\nThat still requires kernel profiling privilege, but the existing check\ndoes not enforce it.\n\nUpdate the permission check to call perf_allow_kernel() when either\nkernel sampling is requested or kernel callchains are requested.\n\nThis keeps permission checks aligned with requested data and prevents\nunprivileged use of kernel callchain capture.","publishedAt":"2026-10-23T12:11:53.327Z","updatedAt":"2026-10-26T06:56:51.396Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"132bee76097be421ab3012130b5b506324cf2be1","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"2581b43e162cfc43e6f5d8dd8d2b38f3441550de","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"6e187281f978a2bff98ead6aa40f8ddc9a2c9afb","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":["https://git.kernel.org/stable/c/132bee76097be421ab3012130b5b506324cf2be1","https://git.kernel.org/stable/c/2581b43e162cfc43e6f5d8dd8d2b38f3441550de","https://git.kernel.org/stable/c/6e187281f978a2bff98ead6aa40f8ddc9a2c9afb","https://git.kernel.org/stable/c/a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98937.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98937","state":"PUBLISHED","datePublished":"2026-10-23T12:11:53.327Z","dateUpdated":"2026-10-26T06:56:51.396Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.381Z"},"containers":{"cna":{"title":"perf/core: Check kernel access when kernel callchains are requested","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Check kernel access when kernel callchains are requested\n\nperf_event_open() currently gates perf_allow_kernel() only on\n!attr.exclude_kernel.\n\nHowever, users can still request kernel callchain collection with\nattr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1.\nThat still requires kernel profiling privilege, but the existing check\ndoes not enforce it.\n\nUpdate the permission check to call perf_allow_kernel() when either\nkernel sampling is requested or kernel callchains are requested.\n\nThis keeps permission checks aligned with requested data and prevents\nunprivileged use of kernel callchain capture."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"132bee76097be421ab3012130b5b506324cf2be1","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"2581b43e162cfc43e6f5d8dd8d2b38f3441550de","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"6e187281f978a2bff98ead6aa40f8ddc9a2c9afb","versionType":"git"},{"version":"0764771dab80d7b84b9a271bee7f1b21a04a3f0c","status":"affected","lessThan":"a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/events/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/132bee76097be421ab3012130b5b506324cf2be1"},{"url":"https://git.kernel.org/stable/c/2581b43e162cfc43e6f5d8dd8d2b38f3441550de"},{"url":"https://git.kernel.org/stable/c/6e187281f978a2bff98ead6aa40f8ddc9a2c9afb"},{"url":"https://git.kernel.org/stable/c/a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-26T06:56:51.396Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}