{ "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": "2026-08-05T12:21:01.693Z" }, "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": "2026-07-14T12:46:18.662Z" }, "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": 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"https://cert-portal.siemens.com/productcert/html/ssa-019113.html" } ] } ] } }