CVE-2026-98626

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98626", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.361Z", "datePublished": "2026-10-18T15:19:47.832Z", "dateUpdated": "2026-10-19T09:22:54.307Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:22:54.307Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["tools/lib/bpf/relo_core.c"], "versions": [{"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "a8c47e62d9aea2d47a09e06c1682c59c21b92449", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "d3219c229d16900cef936adad28633c98946e432", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "f2a24101e89dd0804e717da7c1bd6af513698aa2", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "2d7d04357c41aa49a5ac658fcc207439f2ad6456", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319", "status": "affected", "versionType": "git"}, {"version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "lessThan": "394ae398337c5f87e567f6cd63b937fc2b2f6ddc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["tools/lib/bpf/relo_core.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "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": "5.6", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"}, {"url": "https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"}, {"url": "https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"}, {"url": "https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"}, {"url": "https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"}, {"url": "https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"}, {"url": "https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"}], "title": "bpf: Restrict CO-RE poisoning to relocatable instructions", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["tools/lib/bpf/relo_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a8c47e62d9aea2d47a09e06c1682c59c21b92449", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "d3219c229d16900cef936adad28633c98946e432", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "f2a24101e89dd0804e717da7c1bd6af513698aa2", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "2d7d04357c41aa49a5ac658fcc207439f2ad6456", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}, {"lessThan": "394ae398337c5f87e567f6cd63b937fc2b2f6ddc", "status": "affected", "version": "d7a252708dbc950ca2064310217e8b9f85846e2f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["tools/lib/bpf/relo_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "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: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE."}], "id": "CVE-2026-98626", "lastModified": "2026-10-19T10:19:26.820", "metrics": {}, "published": "2026-10-18T16:17:15.640", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Restrict CO-RE poisoning to relocatable instructions", "id": "2554951", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554951"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1285", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Restrict CO-RE poisoning to relocatable instructions\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE.", "A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. When processing Compile Once \u2013 Run Everywhere (CO-RE) relocation records, the kernel modifies target instructions before verifying that the instruction is an eligible relocation target. A local user can exploit this vulnerability by submitting a BPF program with malformed relocation metadata, causing unintended instructions to be overwritten. This flaw can result in unexpected program behavior or a Denial of Service (DoS) through a system crash."], "name": "CVE-2026-98626", "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"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98626\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98626\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98626.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,a8c47e62d9aea2d47a09e06c1682c59c21b92449)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,d3219c229d16900cef936adad28633c98946e432)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,f2a24101e89dd0804e717da7c1bd6af513698aa2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,2d7d04357c41aa49a5ac658fcc207439f2ad6456)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d7a252708dbc950ca2064310217e8b9f85846e2f,394ae398337c5f87e567f6cd63b937fc2b2f6ddc)"}}], "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": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.222,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.55,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "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": "2026-10-18T18:30:14.375497+00:00", "updated": "2026-10-22T21:45:06.448246+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-1285"]}