{"api_version":"1","generated_at":"2026-04-22T17:48:41+00:00","cve":"CVE-2026-31528","urls":{"html":"https://cve.report/CVE-2026-31528","api":"https://cve.report/api/cve/CVE-2026-31528.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31528","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31528"},"summary":{"title":"perf: Make sure to use pmu_ctx->pmu for groups","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx->pmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-22 14:16:53","updated_at":"2026-04-22 14:16:53"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace","name":"https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1","name":"https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97","name":"https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4","name":"https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b","name":"https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31528","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31528","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd27568117664b8b3e259721393df420ed51f57b 656f35b463995bee024d948440128230aacd81e1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd27568117664b8b3e259721393df420ed51f57b 3a696e84a8b1fafdd774bb30d62919faf844d9e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd27568117664b8b3e259721393df420ed51f57b 35f7914e54fe7f13654c22ee045b05e4b6d8062b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd27568117664b8b3e259721393df420ed51f57b 4c759446046500a1a6785b25725725c3ff087ace git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd27568117664b8b3e259721393df420ed51f57b 4b9ce671960627b2505b3f64742544ae9801df97 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.131 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.80 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * 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":["kernel/events/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"656f35b463995bee024d948440128230aacd81e1","status":"affected","version":"bd27568117664b8b3e259721393df420ed51f57b","versionType":"git"},{"lessThan":"3a696e84a8b1fafdd774bb30d62919faf844d9e4","status":"affected","version":"bd27568117664b8b3e259721393df420ed51f57b","versionType":"git"},{"lessThan":"35f7914e54fe7f13654c22ee045b05e4b6d8062b","status":"affected","version":"bd27568117664b8b3e259721393df420ed51f57b","versionType":"git"},{"lessThan":"4c759446046500a1a6785b25725725c3ff087ace","status":"affected","version":"bd27568117664b8b3e259721393df420ed51f57b","versionType":"git"},{"lessThan":"4b9ce671960627b2505b3f64742544ae9801df97","status":"affected","version":"bd27568117664b8b3e259721393df420ed51f57b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/events/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.2"},{"lessThan":"6.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.131","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.131","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.80","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx->pmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case."}],"providerMetadata":{"dateUpdated":"2026-04-22T13:54:41.180Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"},{"url":"https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"},{"url":"https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"},{"url":"https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"},{"url":"https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"}],"title":"perf: Make sure to use pmu_ctx->pmu for groups","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31528","datePublished":"2026-04-22T13:54:41.180Z","dateReserved":"2026-03-09T15:48:24.111Z","dateUpdated":"2026-04-22T13:54:41.180Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-22 14:16:53","lastModifiedDate":"2026-04-22 14:16:53","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31528","Ordinal":"1","Title":"perf: Make sure to use pmu_ctx->pmu for groups","CVE":"CVE-2026-31528","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31528","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx->pmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case.","Type":"Description","Title":"perf: Make sure to use pmu_ctx->pmu for groups"}]}}}