CVE-2026-98043

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98043", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:19:56.071Z", "datePublished": "2026-09-25T10:23:54.865Z", "dateUpdated": "2026-10-21T12:54:11.750Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:54:11.750Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't infer non-NULL from a pointer with an unbounded offset\n\nreg_not_null() decides that a register holds a non-NULL value by\nlooking at its type alone. For pointer types that allow arithmetic the\ntype only guarantees a non-NULL base, in case of an unbound offset\nthe runtime offset value might still add up to NULL.\nConsider the followng program:\n\n r6 = bpf_map_lookup_elem(map, &0); /* present */\n if (r6 == 0) return 0;\n r7 = bpf_map_lookup_elem(map, &1); /* absent, NULL at runtime */\n r8 = r7;\n r8 -= r6; /* pointer - pointer: unknown scalar, -r6 */\n r8 <<= 1;\n r8 >>= 1; /* any non-negative offset is accepted by */\n /* check_reg_sane_offset_ptr() */\n r6 += r8; /* verifier: map value; runtime: zero */\n if (r7 != r6) return 0;\n *(u8 *)(r7 + 0); /* r7 is inferred non-NULL, both are zero */\n\nAt runtime both registers are zero, the comparison is true and the\nload faults with NULL pointer dereference.\n\nRequire the offset to be within +-BPF_MAX_VAR_OFF in reg_not_null()."}], "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": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "lessThan": "8b414dbe97fcefd116e5a620c3bd9993014aa4ce", "status": "affected", "versionType": "git"}, {"version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "lessThan": "019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae", "status": "affected", "versionType": "git"}, {"version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "lessThan": "65bea674f43c09c0eda033a140dfac6a2842a19f", "status": "affected", "versionType": "git"}, {"version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "lessThan": "cb6642048739bf4ee5aa09fe465511f1e87caa63", "status": "affected", "versionType": "git"}, {"version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "lessThan": "67b529f521a6676cdfc78b91b0217d7eaa84216b", "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": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "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": "5.8", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8b414dbe97fcefd116e5a620c3bd9993014aa4ce"}, {"url": "https://git.kernel.org/stable/c/019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae"}, {"url": "https://git.kernel.org/stable/c/65bea674f43c09c0eda033a140dfac6a2842a19f"}, {"url": "https://git.kernel.org/stable/c/cb6642048739bf4ee5aa09fe465511f1e87caa63"}, {"url": "https://git.kernel.org/stable/c/67b529f521a6676cdfc78b91b0217d7eaa84216b"}], "title": "bpf: Don't infer non-NULL from a pointer with an unbounded offset", "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": "8b414dbe97fcefd116e5a620c3bd9993014aa4ce", "status": "affected", "version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "versionType": "git"}, {"lessThan": "019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae", "status": "affected", "version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "versionType": "git"}, {"lessThan": "65bea674f43c09c0eda033a140dfac6a2842a19f", "status": "affected", "version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "versionType": "git"}, {"lessThan": "cb6642048739bf4ee5aa09fe465511f1e87caa63", "status": "affected", "version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "versionType": "git"}, {"lessThan": "67b529f521a6676cdfc78b91b0217d7eaa84216b", "status": "affected", "version": "cac616db39c207dc63465a4e05c6ce0e60b2cce4", "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": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "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: Don't infer non-NULL from a pointer with an unbounded offset\n\nreg_not_null() decides that a register holds a non-NULL value by\nlooking at its type alone. For pointer types that allow arithmetic the\ntype only guarantees a non-NULL base, in case of an unbound offset\nthe runtime offset value might still add up to NULL.\nConsider the followng program:\n\n r6 = bpf_map_lookup_elem(map, &0); /* present */\n if (r6 == 0) return 0;\n r7 = bpf_map_lookup_elem(map, &1); /* absent, NULL at runtime */\n r8 = r7;\n r8 -= r6; /* pointer - pointer: unknown scalar, -r6 */\n r8 <<= 1;\n r8 >>= 1; /* any non-negative offset is accepted by */\n /* check_reg_sane_offset_ptr() */\n r6 += r8; /* verifier: map value; runtime: zero */\n if (r7 != r6) return 0;\n *(u8 *)(r7 + 0); /* r7 is inferred non-NULL, both are zero */\n\nAt runtime both registers are zero, the comparison is true and the\nload faults with NULL pointer dereference.\n\nRequire the offset to be within +-BPF_MAX_VAR_OFF in reg_not_null()."}], "id": "CVE-2026-98043", "lastModified": "2026-10-21T13:21:19.943", "metrics": {}, "published": "2026-09-25T11:17:33.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/019d845a08b8ccfe8eefaaf4bca6870f2b8c58ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65bea674f43c09c0eda033a140dfac6a2842a19f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67b529f521a6676cdfc78b91b0217d7eaa84216b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b414dbe97fcefd116e5a620c3bd9993014aa4ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb6642048739bf4ee5aa09fe465511f1e87caa63"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Don't infer non-NULL from a pointer with an unbounded offset", "id": "2541101", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541101"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Don't infer non-NULL from a pointer with an unbounded offset\nreg_not_null() decides that a register holds a non-NULL value by\nlooking at its type alone. For pointer types that allow arithmetic the\ntype only guarantees a non-NULL base, in case of an unbound offset\nthe runtime offset value might still add up to NULL.\nConsider the followng program:\nr6 = bpf_map_lookup_elem(map, &0); /* present */\nif (r6 == 0) return 0;\nr7 = bpf_map_lookup_elem(map, &1); /* absent, NULL at runtime */\nr8 = r7;\nr8 -= r6; /* pointer - pointer: unknown scalar, -r6 */\nr8 <<= 1;\nr8 >>= 1; /* any non-negative offset is accepted by */\n/* check_reg_sane_offset_ptr() */\nr6 += r8; /* verifier: map value; runtime: zero */\nif (r7 != r6) return 0;\n*(u8 *)(r7 + 0); /* r7 is inferred non-NULL, both are zero */\nAt runtime both registers are zero, the comparison is true and the\nload faults with NULL pointer dereference.\nRequire the offset to be within +-BPF_MAX_VAR_OFF in reg_not_null().", "A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) verifier. The verifier incorrectly assumes that certain pointer types are non-null without accounting for unbounded offsets that can wrap around to zero at runtime. A local user with permissions to load BPF programs can exploit this flaw by submitting a crafted program, triggering a null pointer dereference that crashes the system and results in a Denial of Service (DoS)."], "name": "CVE-2026-98043", "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": "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": "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "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-2026-98043\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98043\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98043.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cac616db39c207dc63465a4e05c6ce0e60b2cce4,cb6642048739bf4ee5aa09fe465511f1e87caa63)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cac616db39c207dc63465a4e05c6ce0e60b2cce4,67b529f521a6676cdfc78b91b0217d7eaa84216b)"}}], "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": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-09-25T18:15:16.265971+00:00", "updated": "2026-09-30T14:30:18.582447+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}