CVE-2026-23271

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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"}, 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"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": "2026-11-10T12:42:09.869Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "4df1a45819e50993cb351682a6ae8e7ed2d233a0", "versionType": "git"}, {"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "4f8d5812337871227bb2c98669a87c306a2f86ef", "versionType": "git"}, {"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "5c48fdc4b4623533d86e279f51531a7ba212eb87", "versionType": "git"}, {"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "3f89b61dd504c5b6711de9759e053b082f9abf12", "versionType": "git"}, {"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "bb190628fe5f2a73ba762a9972ba16c5e895f73e", "versionType": "git"}, {"status": "affected", "version": "592903cdcbf606a838056bae6d03fc557806c914", "lessThan": "c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae", "versionType": "git"}], "programFiles": ["kernel/events/core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.31"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.31", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.167", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.77", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.17", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.7", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/events/core.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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. 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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nperf: Correcci\u00f3n de la condici\u00f3n de carrera entre __perf_event_overflow() y perf_remove_from_context()\n\nAsegurar que __perf_event_overflow() se ejecute con las IRQ deshabilitadas para todas las cadenas de llamadas posibles. Espec\u00edficamente, los eventos de software pueden terminar ejecut\u00e1ndolo con solo la preemption deshabilitada.\n\nEsto abre una condici\u00f3n de carrera frente a perf_event_exit_event() y funciones relacionadas que liberar\u00e1n varias cosas que la ruta de desbordamiento espera que est\u00e9n presentes, como el programa BPF."}], "id": "CVE-2026-23271", "lastModified": "2026-11-10T13:18:38.023", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23271", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:07:08.097616Z", "version": "2.0.3"}}]}, "published": "2026-03-20T09:16:11.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3f89b61dd504c5b6711de9759e053b082f9abf12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4df1a45819e50993cb351682a6ae8e7ed2d233a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f8d5812337871227bb2c98669a87c306a2f86ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5c48fdc4b4623533d86e279f51531a7ba212eb87"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb190628fe5f2a73ba762a9972ba16c5e895f73e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race", "id": "2449565", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449565"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's perf subsystem. A race condition exists between the `__perf_event_overflow()` function and functions like `perf_remove_from_context()` or `perf_event_exit_event()`. This occurs because `__perf_event_overflow()` may execute with only preemption disabled, allowing other operations to free resources, such as BPF (Berkeley Packet Filter) programs, that the overflow path expects to be available. This could lead to system instability or a denial of service."], "name": "CVE-2026-23271", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23271\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23271\nhttps://lore.kernel.org/linux-cve-announce/2026032031-CVE-2026-23271-657a@gregkh/T"], "threat_severity": "Moderate"}

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