CVE-2026-98047

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98047", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:19:56.072Z", "datePublished": "2026-09-25T10:23:57.347Z", "dateUpdated": "2026-10-21T12:54:13.942Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:54:13.942Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check ancestor frames for rbtree callbacks\n\nbpf_rbtree_add() invokes its comparator while the caller holds the root\nlock. The native insertion code retains raw parent and link pointers across\nthe callback, so the verifier prohibits unlocking, consuming tree nodes,\nor changing RCU state from that callback.\n\nin_rbtree_lock_required_cb() only checks the innermost verifier frame.\nStatic subprogram calls are permitted while holding a spin lock, and such a\ncall pushes a frame without in_callback_fn set. Consequently, all callback\nrestrictions disappear in the nested frame. The subprogram can unlock the\ntree, remove and drop the node being compared, then relock. Native insertion\nresumes with the stale parent pointer and links freed memory into the tree.\n\nWalk all active frames for the rbtree callback instead. Benign static\nsubprograms remain permitted, while callback restrictions follow execution\ninto nested frames."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "lessThan": "252e9b476af723edd299a5c71c389ec018e46656", "status": "affected", "versionType": "git"}, {"version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "lessThan": "b545fa447e09e6844868deb2bee228827fe54d15", "status": "affected", "versionType": "git"}, {"version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "lessThan": "2410cb2ac0416dd2795a81984c8c73d7250bd8c4", "status": "affected", "versionType": "git"}, {"version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "lessThan": "369f4ce734570bdfedaa4b5ca50e2a3f6a892728", "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/bpf/verifier.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.9", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/252e9b476af723edd299a5c71c389ec018e46656"}, {"url": "https://git.kernel.org/stable/c/b545fa447e09e6844868deb2bee228827fe54d15"}, {"url": "https://git.kernel.org/stable/c/2410cb2ac0416dd2795a81984c8c73d7250bd8c4"}, {"url": "https://git.kernel.org/stable/c/369f4ce734570bdfedaa4b5ca50e2a3f6a892728"}], "title": "bpf: Check ancestor frames for rbtree callbacks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "252e9b476af723edd299a5c71c389ec018e46656", "status": "affected", "version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "versionType": "git"}, {"lessThan": "b545fa447e09e6844868deb2bee228827fe54d15", "status": "affected", "version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "versionType": "git"}, {"lessThan": "2410cb2ac0416dd2795a81984c8c73d7250bd8c4", "status": "affected", "version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "versionType": "git"}, {"lessThan": "369f4ce734570bdfedaa4b5ca50e2a3f6a892728", "status": "affected", "version": "a44b1334aadd82203f661adb9adb41e53ad0e8d1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nbpf: Check ancestor frames for rbtree callbacks\n\nbpf_rbtree_add() invokes its comparator while the caller holds the root\nlock. The native insertion code retains raw parent and link pointers across\nthe callback, so the verifier prohibits unlocking, consuming tree nodes,\nor changing RCU state from that callback.\n\nin_rbtree_lock_required_cb() only checks the innermost verifier frame.\nStatic subprogram calls are permitted while holding a spin lock, and such a\ncall pushes a frame without in_callback_fn set. Consequently, all callback\nrestrictions disappear in the nested frame. The subprogram can unlock the\ntree, remove and drop the node being compared, then relock. Native insertion\nresumes with the stale parent pointer and links freed memory into the tree.\n\nWalk all active frames for the rbtree callback instead. Benign static\nsubprograms remain permitted, while callback restrictions follow execution\ninto nested frames."}], "id": "CVE-2026-98047", "lastModified": "2026-10-21T13:21:20.180", "metrics": {}, "published": "2026-09-25T11:17:33.553", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2410cb2ac0416dd2795a81984c8c73d7250bd8c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/252e9b476af723edd299a5c71c389ec018e46656"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/369f4ce734570bdfedaa4b5ca50e2a3f6a892728"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b545fa447e09e6844868deb2bee228827fe54d15"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Check ancestor frames for rbtree callbacks", "id": "2541106", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541106"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Check ancestor frames for rbtree callbacks\nbpf_rbtree_add() invokes its comparator while the caller holds the root\nlock. The native insertion code retains raw parent and link pointers across\nthe callback, so the verifier prohibits unlocking, consuming tree nodes,\nor changing RCU state from that callback.\nin_rbtree_lock_required_cb() only checks the innermost verifier frame.\nStatic subprogram calls are permitted while holding a spin lock, and such a\ncall pushes a frame without in_callback_fn set. Consequently, all callback\nrestrictions disappear in the nested frame. The subprogram can unlock the\ntree, remove and drop the node being compared, then relock. Native insertion\nresumes with the stale parent pointer and links freed memory into the tree.\nWalk all active frames for the rbtree callback instead. Benign static\nsubprograms remain permitted, while callback restrictions follow execution\ninto nested frames.", "A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) verifier, which may allow a local attacker to cause a denial of service (DoS) or potentially escalate privileges. When verifying red-black tree (rbtree) callbacks, the verifier fails to enforce callback restrictions across nested subprogram call frames. A local user capable of loading BPF programs can exploit this issue to bypass safety checks and alter locked tree nodes, resulting in freed memory being linked back into the tree. This behavior causes kernel memory corruption and can lead to a system crash."], "name": "CVE-2026-98047", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "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": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98047\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98047\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98047.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a44b1334aadd82203f661adb9adb41e53ad0e8d1,b545fa447e09e6844868deb2bee228827fe54d15)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a44b1334aadd82203f661adb9adb41e53ad0e8d1,2410cb2ac0416dd2795a81984c8c73d7250bd8c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a44b1334aadd82203f661adb9adb41e53ad0e8d1,369f4ce734570bdfedaa4b5ca50e2a3f6a892728)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"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": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.53,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.7,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T17:15:15.315849+00:00", "updated": "2026-10-01T04:00:14.125624+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}