{"id":"CVE-2026-31528","revision":"016d970b37884ddf92a098d44a07f040","records":[{"revision":"016d970b37884ddf92a098d44a07f040","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31528","aliases":[],"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":0,"publishedAt":"2026-04-22T13:54:41.18+00:00","modifiedAt":"2026-10-19T18:45:55.081+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/events/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"bd27568117664b8b3e259721393df420ed51f57b\",\n                            \"lessThan\": \"656f35b463995bee024d948440128230aacd81e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bd27568117664b8b3e259721393df420ed51f57b\",\n                            \"lessThan\": \"3a696e84a8b1fafdd774bb30d62919faf844d9e4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bd27568117664b8b3e259721393df420ed51f57b\",\n                            \"lessThan\": \"35f7914e54fe7f13654c22ee045b05e4b6d8062b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bd27568117664b8b3e259721393df420ed51f57b\",\n                            \"lessThan\": \"4c759446046500a1a6785b25725725c3ff087ace\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bd27568117664b8b3e259721393df420ed51f57b\",\n                            \"lessThan\": \"4b9ce671960627b2505b3f64742544ae9801df97\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/events/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.131\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.80\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.21\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.11\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1","https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4","https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b","https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace","https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31528","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31528","identifiers":["CVE-2026-31528"]},"retained":false,"historicalAffected":[]}],"coverage":[]}