CVE-2026-99237

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99237", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.402Z", "datePublished": "2026-11-02T16:06:42.386Z", "dateUpdated": "2026-11-03T19:13:04.997Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T19:13:04.997Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Hold trace_types_lock when resetting last boot data from readers\n\nupdate_last_data_if_empty() is called from tracing_open() with O_TRUNC,\ntracing_read_pipe() and tracing_buffers_read() without trace_types_lock.\nTwo readers can both pass the LAST_BOOT test and free module_delta\ntwice, and a module notifier can update module_delta while it is being\nfreed.\n\nTake trace_types_lock in those paths and keep the callers that already\nhold it on an unlocked variant."}], "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 - Reached only via local tracefs on a last-boot instance: tracing_open() with O_TRUNC on instances/<name>/trace, tracing_read_pipe() on trace_pipe, and tracing_buffers_read() on per_cpu/cpuN/trace_pipe_raw all call update_last_data_if_empty() without trace_types_lock. No remote protocol supplies the trigger.\nAC:L - The attacker controls both sides. Two threads can open() the last-boot instance's trace with O_TRUNC, or drain the buffer then race tracing_buffers_read() on two trace_pipe_raw fds; both call update_last_data_if_empty() unlocked so each can pass TRACE_ARRAY_FL_LAST_BOOT and kfree_rcu() the same module_delta. The module-notifier race is not required.\nPR:L - tracing_check_open_get_tr() checks only LOCKDOWN_TRACEFS and tracing_disabled, not capable(). trace is TRACE_MODE_WRITE (0640) and trace_pipe/trace_pipe_raw are TRACE_MODE_READ (0440). tracefs uid=/gid= mounts delegate those inodes to a non-root tracing group on Android/Perfetto and embedded systems that use reserve_mem persistent instances.\nUI:N - The attacker opens, truncates, and reads their own last-boot instance descriptors (tracing_open(O_TRUNC) or tracing_buffers_read()). No other user must mount media, enable tracing, or consume the buffer first.\nS:U - The double-free of tr->module_delta is in the host kernel heap (update_last_data() kfree_rcu() racing make_mod_delta()). It can escalate locally but does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Two update_last_data() callers can both READ_ONCE(tr->module_delta) then kfree_rcu() it, and make_mod_delta() still indexes module_delta->delta[] after the free. That slab use-after-free of the flex-array object is an arbitrary kernel-memory read primitive.\nI:H - The same double kfree_rcu(module_delta) plus make_mod_delta() writing module_delta->delta[i] after the object is freed is a heap use-after-free write. Reclaiming that slab yields an arbitrary kernel write and control-flow hijack, not merely a crash.\nA:H - Double-free of module_delta, or make_mod_delta() using it after WRITE_ONCE(tr->module_delta, NULL), oopses or panics the kernel. The attacker retriggers that crash through the unlocked tracing_open(O_TRUNC) or tracing_buffers_read() paths."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace.c"], "versions": [{"version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "lessThan": "92b69f6db640dadc0851762ee2e12db99f083cad", "status": "affected", "versionType": "git"}, {"version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "lessThan": "d6d991afe775ab7fcf89523a2502b7ca3be56ffd", "status": "affected", "versionType": "git"}, {"version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "lessThan": "1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa", "status": "affected", "versionType": "git"}, {"version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "lessThan": "5a6bd62f09147b49b31fd19d4eba122cb5f941a1", "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/trace/trace.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.60", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.14", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3.1", "lessThanOrEqual": "7.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.4-rc1", "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": "6.16", "versionEndExcluding": "6.18.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.3.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.4-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad"}, {"url": "https://git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd"}, {"url": "https://git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa"}, {"url": "https://git.kernel.org/stable/c/5a6bd62f09147b49b31fd19d4eba122cb5f941a1"}], "title": "tracing: Hold trace_types_lock when resetting last boot data from readers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "92b69f6db640dadc0851762ee2e12db99f083cad", "status": "affected", "version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "versionType": "git"}, {"lessThan": "d6d991afe775ab7fcf89523a2502b7ca3be56ffd", "status": "affected", "version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "versionType": "git"}, {"lessThan": "1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa", "status": "affected", "version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "versionType": "git"}, {"lessThan": "5a6bd62f09147b49b31fd19d4eba122cb5f941a1", "status": "affected", "version": "32dc0042528d385d83bf458e4cf3a49c5110afea", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/trace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.60", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.14", "versionType": "semver"}, {"lessThanOrEqual": "7.3.*", "status": "unaffected", "version": "7.3.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.4-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Hold trace_types_lock when resetting last boot data from readers\n\nupdate_last_data_if_empty() is called from tracing_open() with O_TRUNC,\ntracing_read_pipe() and tracing_buffers_read() without trace_types_lock.\nTwo readers can both pass the LAST_BOOT test and free module_delta\ntwice, and a module notifier can update module_delta while it is being\nfreed.\n\nTake trace_types_lock in those paths and keep the callers that already\nhold it on an unlocked variant."}], "id": "CVE-2026-99237", "lastModified": "2026-11-03T20:18:30.007", "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"}]}, "published": "2026-11-02T16:17:49.213", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5a6bd62f09147b49b31fd19d4eba122cb5f941a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: privilege escalation via race condition in tracing subsystem", "id": "2565279", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565279"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's tracing subsystem. A race condition exists due to missing locking when resetting trace data during concurrent reader operations. A local attacker with access to tracing interfaces can exploit this vulnerability by performing concurrent file operations, triggering memory corruption such as a use-after-free or double-free condition. Successful exploitation could allow an attacker to escalate privileges, execute arbitrary code in the kernel, or cause a Denial of Service (DoS) by crashing the system."], "name": "CVE-2026-99237", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-10", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-02T16:06:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99237\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99237\nhttps://git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa\nhttps://git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad\nhttps://git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,92b69f6db640dadc0851762ee2e12db99f083cad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,d6d991afe775ab7fcf89523a2502b7ca3be56ffd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.60,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.14,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3.1,7.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,92b69f6db640dadc0851762ee2e12db99f083cad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,d6d991afe775ab7fcf89523a2502b7ca3be56ffd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[32dc0042528d385d83bf458e4cf3a49c5110afea,1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.60,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.14,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3.1,7.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-11-02T18:30:17.733176+00:00", "updated": "2026-11-03T17:00:16.655401+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}