CVE-2026-31528High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: perf: Make sure to use pmu_ctx->pmu for groups Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access when group_sched_in() fails and needs to…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
perf: Make sure to use pmu_ctx->pmu for groups
Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access when group_sched_in() fails and needs to roll back.
This should be handled by the transaction callbacks, but he found that when the group leader is a software event, the transaction handlers of the wrong PMU are used. Despite the move_group case in perf_event_open() and group_sched_in() using pmu_ctx->pmu.
Turns out, inherit uses event->pmu to clone the events, effectively undoing the move_group case for all inherited contexts. Fix this by also making inherit use pmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.
Similarly, __perf_event_read() should use equally use pmu_ctx->pmu for the group case.
Linux >= bd27568117664b8b3e259721393df420ed51f57b < 656f35b463995bee024d948440128230aacd81e1Linux >= bd27568117664b8b3e259721393df420ed51f57b < 3a696e84a8b1fafdd774bb30d62919faf844d9e4Linux >= bd27568117664b8b3e259721393df420ed51f57b < 35f7914e54fe7f13654c22ee045b05e4b6d8062bLinux >= bd27568117664b8b3e259721393df420ed51f57b < 4c759446046500a1a6785b25725725c3ff087aceLinux >= bd27568117664b8b3e259721393df420ed51f57b < 4b9ce671960627b2505b3f64742544ae9801df97Linux 6.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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