| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Order the PMU list to fix warning about unordered pmu_ctx_list\n\nSyskaller triggers a warning due to prev_epc->pmu != next_epc->pmu in\nperf_event_swap_task_ctx_data(). vmcore shows that two lists have the same\nperf_event_pmu_context, but not in the same order.\n\nThe problem is that the order of pmu_ctx_list for the parent is impacted by\nthe time when an event/PMU is added. While the order for a child is\nimpacted by the event order in the pinned_groups and flexible_groups. So\nthe order of pmu_ctx_list in the parent and child may be different.\n\nTo fix this problem, insert the perf_event_pmu_context to its proper place\nafter iteration of the pmu_ctx_list.\n\nThe follow testcase can trigger above warning:\n\n # perf record -e cycles --call-graph lbr -- taskset -c 3 ./a.out &\n # perf stat -e cpu-clock,cs -p xxx // xxx is the pid of a.out\n\n test.c\n\n void main() {\n int count = 0;\n pid_t pid;\n\n printf(\"%d running\\n\", getpid());\n sleep(30);\n printf(\"running\\n\");\n\n pid = fork();\n if (pid == -1) {\n printf(\"fork error\\n\");\n return;\n }\n if (pid == 0) {\n while (1) {\n count++;\n }\n } else {\n while (1) {\n count++;\n }\n }\n }\n\nThe testcase first opens an LBR event, so it will allocate task_ctx_data,\nand then open tracepoint and software events, so the parent context will\nhave 3 different perf_event_pmu_contexts. On inheritance, child ctx will\ninsert the perf_event_pmu_context in another order and the warning will\ntrigger.\n\n[ mingo: Tidied up the changelog. ]" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/events/core.c" |
| ], |
| "versions": [ |
| { |
| "version": "bd27568117664b8b3e259721393df420ed51f57b", |
| "lessThan": "f0c3971405cef6892844016aa710121a02da3a23", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "bd27568117664b8b3e259721393df420ed51f57b", |
| "lessThan": "7d582eb6e4e100959ba07083d7563453c8c2a343", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "bd27568117664b8b3e259721393df420ed51f57b", |
| "lessThan": "3e812a70732d84b7873cea61a7f6349b9a9dcbf5", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "bd27568117664b8b3e259721393df420ed51f57b", |
| "lessThan": "2016066c66192a99d9e0ebf433789c490a6785a2", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "kernel/events/core.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.2", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.2", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.81", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12.18", |
| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.13.6", |
| "lessThanOrEqual": "6.13.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.14", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.2", |
| "versionEndExcluding": "6.6.81" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.2", |
| "versionEndExcluding": "6.12.18" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.2", |
| "versionEndExcluding": "6.13.6" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.2", |
| "versionEndExcluding": "6.14" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/f0c3971405cef6892844016aa710121a02da3a23" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/7d582eb6e4e100959ba07083d7563453c8c2a343" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/3e812a70732d84b7873cea61a7f6349b9a9dcbf5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/2016066c66192a99d9e0ebf433789c490a6785a2" |
| } |
| ], |
| "title": "perf/core: Order the PMU list to fix warning about unordered pmu_ctx_list", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2025-21895", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
