{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74668", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.924Z", "datePublished": "2026-08-22T15:32:39.583Z", "dateUpdated": "2026-08-27T12:40:01.903Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:40:01.903Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in TX_RING send path\n\ntpacket_snd() reads dev->hard_header_len independently for skb\nallocation and header construction in tpacket_fill_skb(). Concurrent\nnetdevice reconfiguration can therefore make the reserved headroom\nsmaller than the amount later pushed, or make copylen - hard_header_len\nnegative.\n\nSnapshot hard_header_len once before processing ring frames and use it\nfor the frame limit, headroom allocation, copy length, and skb\nconstruction. Pass the snapshot to tpacket_fill_skb().\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here."}], "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 flaw is reached only via local syscalls on an AF_PACKET socket with PACKET_TX_RING configured (sendmsg on mmap ring frames); it is not triggered by processing remotely received network traffic.\nAC:L - An attacker can open the TX_RING socket and concurrently reconfigure the bound netdev (e.g., VLAN/bonding/macvlan changes) in a user+network namespace, controlling both sides of the hard_header_len race without depending on external timing.\nPR:L - Exploitation requires CAP_NET_RAW to create AF_PACKET sockets and CAP_NET_ADMIN to change netdev hard_header_len; both are obtainable by an unprivileged user inside a user namespace without init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers the bug using their own packet socket, TX_RING, and netdev reconfiguration threads.\nS:U - Impact is kernel heap corruption and local privilege escalation within the same kernel security domain; it does not constitute a VM escape, sandbox breakout, or IOMMU boundary bypass.\nC:H - Racing hard_header_len can make skb_push exceed reserved headroom or skb_put use a negative length (huge unsigned), and subsequent skb_store_bits writes before skb->head or far past skb->tail, corrupting adjacent slab objects and enabling kernel memory disclosure.\nI:H - Inconsistent hard_header_len between skb allocation and tpacket_fill_skb causes out-of-bounds linear expansion and data writes in the skb buffer, yielding heap corruption primitives suitable for control-flow hijacking and local privilege escalation.\nA:H - Corrupted skb_push/put operations invoke skb_under_panic or skb_over_panic (BUG), causing kernel oops/panic and reliable denial of service even when exploitation is not completed."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/packet/af_packet.c"], "versions": [{"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "9c7e8ff48c377bef18c3d178748aea0575b69ede", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "2a73b2c37ee3060a880b53cd24783d93fc7be5f8", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "d85d2fd54e901637c81d847811e03c662aee13cd", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "016763e829cac37b3234eace86fd0a4c560de4a7", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "27e068d1b35dbec10a3cf268887c94407be4badc", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "d48ea5c9c4c34dc0df621f0e39ed3a16b644621a", "status": "affected", "versionType": "git"}, {"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "lessThan": "21b5953e7494c16a42e6cd8cf110e18d13ae4a6b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/packet/af_packet.c"], "versions": [{"version": "2.6.31", "status": "affected"}, {"version": "0", "lessThan": "2.6.31", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.267", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.218", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.185", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.10.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.15.218"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.1.185"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede"}, {"url": "https://git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8"}, {"url": "https://git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2"}, {"url": "https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd"}, {"url": "https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7"}, {"url": "https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc"}, {"url": "https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a"}, {"url": "https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b"}], "title": "packet: use consistent hard_header_len in TX_RING send path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9c7e8ff48c377bef18c3d178748aea0575b69ede", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "2a73b2c37ee3060a880b53cd24783d93fc7be5f8", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "d85d2fd54e901637c81d847811e03c662aee13cd", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "016763e829cac37b3234eace86fd0a4c560de4a7", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "27e068d1b35dbec10a3cf268887c94407be4badc", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "d48ea5c9c4c34dc0df621f0e39ed3a16b644621a", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}, {"lessThan": "21b5953e7494c16a42e6cd8cf110e18d13ae4a6b", "status": "affected", "version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.31"}, {"lessThan": "2.6.31", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.267", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.218", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.185", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\npacket: use consistent hard_header_len in TX_RING send path\n\ntpacket_snd() reads dev->hard_header_len independently for skb\nallocation and header construction in tpacket_fill_skb(). Concurrent\nnetdevice reconfiguration can therefore make the reserved headroom\nsmaller than the amount later pushed, or make copylen - hard_header_len\nnegative.\n\nSnapshot hard_header_len once before processing ring frames and use it\nfor the frame limit, headroom allocation, copy length, and skb\nconstruction. Pass the snapshot to tpacket_fill_skb().\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here."}], "id": "CVE-2026-74668", "lastModified": "2026-08-27T13:18:36.817", "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": "2026-08-22T16:16:40.720", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: packet: use consistent hard_header_len in TX_RING send path", "id": "2521367", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521367"}, "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-131", "details": ["A flaw was found in the Linux kernel's packet handling mechanism. During concurrent network device reconfigurations, an inconsistency in how the `hard_header_len` value is used can lead to memory corruption. This issue could allow an attacker to cause a denial of service by triggering a system crash or potentially lead to other unpredictable system behavior."], "name": "CVE-2026-74668", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74668\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74668\nhttps://lore.kernel.org/linux-cve-announce/2026082229-CVE-2026-74668-1a30@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1,d85d2fd54e901637c81d847811e03c662aee13cd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1,016763e829cac37b3234eace86fd0a4c560de4a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1,27e068d1b35dbec10a3cf268887c94407be4badc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1,d48ea5c9c4c34dc0df621f0e39ed3a16b644621a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1,21b5953e7494c16a42e6cd8cf110e18d13ae4a6b)"}}], "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": "semver", "value": "2.6.31"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.31)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-22T19:15:03.627892+00:00", "updated": "2026-08-25T08:15:04.729137+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}