{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23271","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.991Z","datePublished":"2026-03-20T08:08:46.711Z","dateUpdated":"2026-09-08T08:45:14.715Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:21:01.693Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix __perf_event_overflow() vs perf_remove_from_context() race\n\nMake sure that __perf_event_overflow() runs with IRQs disabled for all\npossible callchains. Specifically the software events can end up running\nit with only preemption disabled.\n\nThis opens up a race vs perf_event_exit_event() and friends that will go\nand free various things the overflow path expects to be present, like\nthe BPF program."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerability is triggered through the perf_event_open() syscall and closing the event fd, both local operations requiring local system access.\nAC:L - The attacker controls both sides of the race: one thread triggers the software perf event overflow while another thread closes the fd. The attacker creates and controls the race timing, making it reliably exploitable.\nPR:L - An unprivileged local user can create software perf events with exclude_kernel=1 under the default perf_event_paranoid=2 setting. No special capabilities are required.\nUI:N - No user interaction is needed. The attacker creates the perf event, triggers it, and races the close() independently.\nS:U - The vulnerability results in kernel privilege escalation within the same security authority (kernel context). There is no crossing of virtualization or sandbox boundaries.\nC:H - The use-after-free on the perf_event structure gives the attacker control over freed memory contents via heap spraying, enabling arbitrary kernel memory reads through controlled function pointer calls.\nI:H - The UAF includes a function pointer call (event->overflow_handler) from potentially attacker-controlled freed memory, providing a direct code execution primitive for arbitrary kernel code execution.\nA:H - The use-after-free will cause kernel crashes (oops/panic) even without sophisticated exploitation, as accessing freed memory leads to immediate instability."}]}],"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":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"4df1a45819e50993cb351682a6ae8e7ed2d233a0","status":"affected","versionType":"git"},{"version":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"4f8d5812337871227bb2c98669a87c306a2f86ef","status":"affected","versionType":"git"},{"version":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"5c48fdc4b4623533d86e279f51531a7ba212eb87","status":"affected","versionType":"git"},{"version":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"3f89b61dd504c5b6711de9759e053b082f9abf12","status":"affected","versionType":"git"},{"version":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"bb190628fe5f2a73ba762a9972ba16c5e895f73e","status":"affected","versionType":"git"},{"version":"592903cdcbf606a838056bae6d03fc557806c914","lessThan":"c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae","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":"2.6.31","status":"affected"},{"version":"0","lessThan":"2.6.31","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.77","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.17","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.7","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"2.6.31","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4df1a45819e50993cb351682a6ae8e7ed2d233a0"},{"url":"https://git.kernel.org/stable/c/4f8d5812337871227bb2c98669a87c306a2f86ef"},{"url":"https://git.kernel.org/stable/c/5c48fdc4b4623533d86e279f51531a7ba212eb87"},{"url":"https://git.kernel.org/stable/c/3f89b61dd504c5b6711de9759e053b082f9abf12"},{"url":"https://git.kernel.org/stable/c/bb190628fe5f2a73ba762a9972ba16c5e895f73e"},{"url":"https://git.kernel.org/stable/c/c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae"}],"title":"perf: Fix __perf_event_overflow() vs perf_remove_from_context() race","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"x_adpType":"supplier","providerMetadata":{"orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP","dateUpdated":"2026-09-08T08:45:14.715Z"},"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP 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