CVE-2026-74582

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74582", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.918Z", "datePublished": "2026-08-21T16:31:55.283Z", "dateUpdated": "2026-10-16T19:05:58.230Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:39:47.499Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev->hard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb->data back by reserve\nthen places it before skb->head, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\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 in packet_snd() and packet_sendmsg_spkt() on the local AF_PACKET sendmsg() transmit path; it is not triggered by processing remotely received network traffic or pre-authentication network services.\nAC:L - An attacker in a user+network namespace can open an AF_PACKET SOCK_RAW socket and concurrently reconfigure the bound netdev (bonding/VLAN/macvlan/team) to change hard_header_len, controlling both sides of the race without 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 sendmsg calls and concurrent 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 place skb->data before skb->head, and skb_copy_datagram_from_iter/memcpy_from_msg then writes attacker-controlled data outside the skb buffer, corrupting adjacent slab objects and enabling kernel memory disclosure.\nI:H - Inconsistent hard_header_len between skb allocation and header adjustment causes out-of-bounds kernel heap writes of attacker-controlled packet data, yielding corruption primitives suitable for control-flow hijacking and local privilege escalation.\nA:H - Out-of-bounds skb buffer writes corrupt kmalloc metadata and can trigger kernel oops/panic, causing reliable denial of service even when full 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": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "versions": [{"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "142e287b3a25cfe909215177c23243e7fc5ae2b1", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "91f041451f967cd87ed722a8f43c0b767a64f1a0", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "b06b6fce6d7deaf7238e09b48ce3b1125ff41acd", "status": "affected", "versionType": "git"}, {"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "03390aa32e669cc4ecd7d34108e2e1afc13d689d", "status": "affected", "versionType": "git"}, {"version": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa", "status": "affected", "versionType": "git"}, {"version": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3", "status": "affected", "versionType": "git"}, {"version": "01a658c1b9d4b5393c38d5a92d9112ab1425382a", "status": "affected", "versionType": "git"}, {"version": "8809ae6747e760e6f1d2453ceb08c9bcc4939766", "status": "affected", "versionType": "git"}, {"version": "4.4.133", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.103", "lessThan": "4.10", "status": "affected", "versionType": "semver"}, {"version": "4.14.44", "lessThan": "4.15", "status": "affected", "versionType": "semver"}, {"version": "4.16.12", "lessThan": "4.17", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "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": "4.17", "versionEndExcluding": "5.10.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.218"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.185"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.133"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"}, {"url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"}, {"url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"}, {"url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"}, {"url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"}, {"url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"}, {"url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"}, {"url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"}], "title": "packet: use consistent hard_header_len in non-ring send paths", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74582", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:14.406882Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:58.230Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74582", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:14.406882Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:01:15.519Z"}}], "cna": {"title": "packet: use consistent hard_header_len in non-ring send paths", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is in packet_snd() and packet_sendmsg_spkt() on the local AF_PACKET sendmsg() transmit path; it is not triggered by processing remotely received network traffic or pre-authentication network services.\nAC:L - An attacker in a user+network namespace can open an AF_PACKET SOCK_RAW socket and concurrently reconfigure the bound netdev (bonding/VLAN/macvlan/team) to change hard_header_len, controlling both sides of the race without 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 sendmsg calls and concurrent 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 place skb->data before skb->head, and skb_copy_datagram_from_iter/memcpy_from_msg then writes attacker-controlled data outside the skb buffer, corrupting adjacent slab objects and enabling kernel memory disclosure.\nI:H - Inconsistent hard_header_len between skb allocation and header adjustment causes out-of-bounds kernel heap writes of attacker-controlled packet data, yielding corruption primitives suitable for control-flow hijacking and local privilege escalation.\nA:H - Out-of-bounds skb buffer writes corrupt kmalloc metadata and can trigger kernel oops/panic, causing reliable denial of service even when full exploitation is not completed."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "142e287b3a25cfe909215177c23243e7fc5ae2b1", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "91f041451f967cd87ed722a8f43c0b767a64f1a0", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "b06b6fce6d7deaf7238e09b48ce3b1125ff41acd", "versionType": "git"}, {"status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "lessThan": "03390aa32e669cc4ecd7d34108e2e1afc13d689d", "versionType": "git"}, {"status": "affected", "version": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa", "versionType": "git"}, {"status": "affected", "version": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3", "versionType": "git"}, {"status": "affected", "version": "01a658c1b9d4b5393c38d5a92d9112ab1425382a", "versionType": "git"}, {"status": "affected", "version": "8809ae6747e760e6f1d2453ceb08c9bcc4939766", "versionType": "git"}, {"status": "affected", "version": "4.4.133", "lessThan": "4.5", "versionType": "semver"}, {"status": "affected", "version": "4.9.103", "lessThan": "4.10", "versionType": "semver"}, {"status": "affected", "version": "4.14.44", "lessThan": "4.15", "versionType": "semver"}, {"status": "affected", "version": "4.16.12", "lessThan": "4.17", "versionType": "semver"}], "programFiles": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.267", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.218", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.185", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.152", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.104", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.45", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.9", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"}, {"url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"}, {"url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"}, {"url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"}, {"url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"}, {"url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"}, {"url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"}, {"url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev->hard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb->data back by reserve\nthen places it before skb->head, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.267", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.218", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.185", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.4.133"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.9.103"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.14.44"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.16.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:39:47.499Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74582", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:58.230Z", "dateReserved": "2026-08-15T05:44:03.918Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-21T16:31:55.283Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "142e287b3a25cfe909215177c23243e7fc5ae2b1", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "91f041451f967cd87ed722a8f43c0b767a64f1a0", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "b06b6fce6d7deaf7238e09b48ce3b1125ff41acd", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"lessThan": "03390aa32e669cc4ecd7d34108e2e1afc13d689d", "status": "affected", "version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba", "versionType": "git"}, {"status": "affected", "version": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa", "versionType": "git"}, {"status": "affected", "version": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3", "versionType": "git"}, {"status": "affected", "version": "01a658c1b9d4b5393c38d5a92d9112ab1425382a", "versionType": "git"}, {"status": "affected", "version": "8809ae6747e760e6f1d2453ceb08c9bcc4939766", "versionType": "git"}, {"lessThan": "4.5", "status": "affected", "version": "4.4.133", "versionType": "semver"}, {"lessThan": "4.10", "status": "affected", "version": "4.9.103", "versionType": "semver"}, {"lessThan": "4.15", "status": "affected", "version": "4.14.44", "versionType": "semver"}, {"lessThan": "4.17", "status": "affected", "version": "4.16.12", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/netdevice.h", "net/packet/af_packet.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"lessThan": "4.17", "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 non-ring send paths\n\npacket_snd() reads dev->hard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb->data back by reserve\nthen places it before skb->head, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npacket: usar un hard_header_len consistente en las rutas de env\u00edo que no son de anillo\n\npacket_snd() lee dev -> hard_header_len m\u00faltiples veces mientras asigna y construye un skb. La reconfiguraci\u00f3n del dispositivo puede cambiar este valor concurrentemente, por ejemplo, a trav\u00e9s de cambios en el tipo de dispositivo de enlace.\n\nPara SOCK_RAW, packet_snd() puede guardar un valor mayor en reserva y luego asignar espacio de cabecera usando un valor menor. Mover skb -> data hacia atr\u00e1s por la reserva entonces lo coloca antes de skb -> head, y la siguiente copia desde el espacio de usuario puede intentar una escritura fuera de l\u00edmites.\n\npacket_sendmsg_spkt() tiene el mismo problema porque calcula su reserva y desplazamiento de cabecera a partir de lecturas separadas antes de liberar el bloqueo de lectura RCU para asignar el skb.\n\nA\u00f1adir LL_RESERVED_SPACE_EX() para las funciones llamantes que ya guardaron una longitud de cabecera. Leer hard_header_len una vez en packet_snd() y usarlo para la asignaci\u00f3n y construcci\u00f3n. En packet_sendmsg_spkt(), preservar el valor en el momento de la asignaci\u00f3n a trav\u00e9s del reintento de b\u00fasqueda del dispositivo.\n\nEl problema de consistencia separado de SOCK_DGRAM entre hard_header_len y header_ops -> create no se aborda aqu\u00ed."}], "id": "CVE-2026-74582", "lastModified": "2026-10-16T20:17:40.100", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74582", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:01:14.406882Z", "version": "2.0.3"}}]}, "published": "2026-08-21T17:16:44.507", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: packet: use consistent hard_header_len in non-ring send paths", "id": "2521057", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521057"}, "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-787", "details": ["A flaw was found in the Linux kernel's packet handling functions, specifically packet_snd() and packet_sendmsg_spkt(). This vulnerability arises from inconsistent handling of network device header lengths during packet construction. A local attacker could exploit this by triggering a race condition during device reconfiguration, leading to an out-of-bounds write. This could potentially allow for privilege escalation or arbitrary code execution."], "name": "CVE-2026-74582", "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": "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": "2026-08-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74582\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74582\nhttps://lore.kernel.org/linux-cve-announce/2026082100-CVE-2026-74582-3296@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba,91f041451f967cd87ed722a8f43c0b767a64f1a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba,9052756290962ffb9a661bcf319e92dedaaedfed)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba,5bb10753d428aadfc356a2bfe9acea09c82a62ec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba,b06b6fce6d7deaf7238e09b48ce3b1125ff41acd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba,03390aa32e669cc4ecd7d34108e2e1afc13d689d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d9fb8cc230b2a4757e9fe4f81468f81212d4deaa,d9fb8cc230b2a4757e9fe4f81468f81212d4deaa]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6190cce26e40bf71c4d375b21eea74bb07b6a0f3,6190cce26e40bf71c4d375b21eea74bb07b6a0f3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01a658c1b9d4b5393c38d5a92d9112ab1425382a,01a658c1b9d4b5393c38d5a92d9112ab1425382a]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8809ae6747e760e6f1d2453ceb08c9bcc4939766,8809ae6747e760e6f1d2453ceb08c9bcc4939766]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.133,4.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.9.103,4.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.14.44,4.15)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.16.12,4.17)"}}], "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": "[4.17,4.17]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "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": "2026-08-21T17:45:03.822821+00:00", "updated": "2026-08-25T07:00:08.065094+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}