CVE-2026-74579

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74579", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.917Z", "datePublished": "2026-08-17T05:28:27.768Z", "dateUpdated": "2026-10-16T19:05:57.728Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:05.144Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field. For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand. It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n shift exponent 120 is too large for 32-bit type 'int'\n ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached only when installing nftables rules via NETLINK_NETFILTER (NFT_MSG_NEWRULE) on NFT_CHAIN_HW_OFFLOAD netdev ingress chains; nft_flow_rule_create() calls nft_payload_offload_mask() during expr offload setup, which is a local netlink syscall path per kernel CNA guidance for nftables/netfilter.\nAC:L - An attacker with CAP_NET_ADMIN can deterministically craft a partial-field payload match (e.g., priv_len=1 on IPv6 saddr with field_len=16) on an HW-offload chain; no race, memory layout, or other conditions outside attacker control are required to hit the undefined shift and incorrect mask build.\nPR:L - All nf_tables netlink operations are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(), checked against the socket network namespace user_ns; unprivileged local users routinely obtain CAP_NET_ADMIN via user+network namespaces (unshare -Urn) on cloud hosts and containers.\nUI:N - No victim interaction is required; the attacker installs the malformed HW-offload nftables rule through their own netlink socket and triggers the bug during rule commit without needing another user to mount filesystems, open files, or take any action.\nS:U - Impact is confined to the host kernel and its hardware-offloaded netdev ingress filtering policy (incorrect TC flower masks, potential kernel crash); this is standard kernel/network-authority impact, not a VM escape, IOMMU bypass, or cross-security-boundary scope change.\nC:N - The bug corrupts on-stack bitmask construction during rule installation and does not perform out-of-bounds reads, use-after-free, or other memory-disclosure primitives; no attacker-influenced kernel memory read path exists beyond incorrect mask values.\nI:H - Incorrect or UB-corrupted HW flower match masks misprogram NIC ingress ACLs on hardware-offloaded edge firewalls, causing accept/drop/redirect actions to apply to traffic contrary to administrator intent; this is exploitable integrity compromise of enforced network policy on internet-facing offload deployments.\nA:H - The undefined shift (1<<120) triggers documented UBSAN shift-out-of-bounds at rule install and can panic/oops on UBSAN/trap kernels; misprogrammed HW offload masks can also blackhole or mis-drop production ingress traffic on netdev-offloaded chains, satisfying CNA high availability guidance."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nft_payload.c"], "versions": [{"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "8720df4504e0ed1781a702f65251bd47b3534d5e", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "363c3a84a946d53e5e121c9f47c7c2b7d228c46b", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "b19b5d2e042c294e2cc1c908dc598f9d64015396", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "a375d8ace807767f29f276b681b6324c74929b1d", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "16b553c46e347bc9de9946c4960654d5884a86de", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "630295d5bba1d0e0f494cc459452eb0a0058c545", "status": "affected", "versionType": "git"}, {"version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "39e88f28fb32bf02bd4b525c24c842c9cff5663d", "status": "affected", "versionType": "git"}, {"version": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015", "status": "affected", "versionType": "git"}, {"version": "5.9.14", "lessThan": "5.10", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nft_payload.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "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": "5.10", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"}, {"url": "https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e"}, {"url": "https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b"}, {"url": "https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"}, {"url": "https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"}, {"url": "https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"}, {"url": "https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"}, {"url": "https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"}], "title": "netfilter: nft_payload: fix mask build for partial field offload", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74579", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:02.815654Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:57.728Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74579", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:02.815654Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:01:04.380Z"}}], "cna": {"title": "netfilter: nft_payload: fix mask build for partial field offload", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached only when installing nftables rules via NETLINK_NETFILTER (NFT_MSG_NEWRULE) on NFT_CHAIN_HW_OFFLOAD netdev ingress chains; nft_flow_rule_create() calls nft_payload_offload_mask() during expr offload setup, which is a local netlink syscall path per kernel CNA guidance for nftables/netfilter.\nAC:L - An attacker with CAP_NET_ADMIN can deterministically craft a partial-field payload match (e.g., priv_len=1 on IPv6 saddr with field_len=16) on an HW-offload chain; no race, memory layout, or other conditions outside attacker control are required to hit the undefined shift and incorrect mask build.\nPR:L - All nf_tables netlink operations are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(), checked against the socket network namespace user_ns; unprivileged local users routinely obtain CAP_NET_ADMIN via user+network namespaces (unshare -Urn) on cloud hosts and containers.\nUI:N - No victim interaction is required; the attacker installs the malformed HW-offload nftables rule through their own netlink socket and triggers the bug during rule commit without needing another user to mount filesystems, open files, or take any action.\nS:U - Impact is confined to the host kernel and its hardware-offloaded netdev ingress filtering policy (incorrect TC flower masks, potential kernel crash); this is standard kernel/network-authority impact, not a VM escape, IOMMU bypass, or cross-security-boundary scope change.\nC:N - The bug corrupts on-stack bitmask construction during rule installation and does not perform out-of-bounds reads, use-after-free, or other memory-disclosure primitives; no attacker-influenced kernel memory read path exists beyond incorrect mask values.\nI:H - Incorrect or UB-corrupted HW flower match masks misprogram NIC ingress ACLs on hardware-offloaded edge firewalls, causing accept/drop/redirect actions to apply to traffic contrary to administrator intent; this is exploitable integrity compromise of enforced network policy on internet-facing offload deployments.\nA:H - The undefined shift (1<<120) triggers documented UBSAN shift-out-of-bounds at rule install and can panic/oops on UBSAN/trap kernels; misprogrammed HW offload masks can also blackhole or mis-drop production ingress traffic on netdev-offloaded chains, satisfying CNA high availability guidance."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "8720df4504e0ed1781a702f65251bd47b3534d5e", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "363c3a84a946d53e5e121c9f47c7c2b7d228c46b", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "b19b5d2e042c294e2cc1c908dc598f9d64015396", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "a375d8ace807767f29f276b681b6324c74929b1d", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "16b553c46e347bc9de9946c4960654d5884a86de", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "630295d5bba1d0e0f494cc459452eb0a0058c545", "versionType": "git"}, {"status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "lessThan": "39e88f28fb32bf02bd4b525c24c842c9cff5663d", "versionType": "git"}, {"status": "affected", "version": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015", "versionType": "git"}, {"status": "affected", "version": "5.9.14", "lessThan": "5.10", "versionType": "semver"}], "programFiles": ["net/netfilter/nft_payload.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/nft_payload.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"}, {"url": "https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e"}, {"url": "https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b"}, {"url": "https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"}, {"url": "https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"}, {"url": "https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"}, {"url": "https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"}, {"url": "https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field. For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand. It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n shift exponent 120 is too large for 32-bit type 'int'\n ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.151", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.103", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.44", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.8", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.9.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:05.144Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74579", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:57.728Z", "dateReserved": "2026-08-15T05:44:03.917Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-17T05:28:27.768Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nft_payload.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "8720df4504e0ed1781a702f65251bd47b3534d5e", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "363c3a84a946d53e5e121c9f47c7c2b7d228c46b", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "b19b5d2e042c294e2cc1c908dc598f9d64015396", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "a375d8ace807767f29f276b681b6324c74929b1d", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "16b553c46e347bc9de9946c4960654d5884a86de", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "630295d5bba1d0e0f494cc459452eb0a0058c545", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"lessThan": "39e88f28fb32bf02bd4b525c24c842c9cff5663d", "status": "affected", "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32", "versionType": "git"}, {"status": "affected", "version": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015", "versionType": "git"}, {"lessThan": "5.10", "status": "affected", "version": "5.9.14", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nft_payload.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "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\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field. For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand. It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n shift exponent 120 is too large for 32-bit type 'int'\n ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes."}], "id": "CVE-2026-74579", "lastModified": "2026-10-16T20:17:39.580", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74579", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:01:02.815654Z", "version": "2.0.3"}}]}, "published": "2026-08-17T06:19:56.417", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: netfilter: nft_payload: fix mask build for partial field offload", "id": "2517319", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517319"}, "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-1335", "details": ["A flaw was found in the Linux kernel's `netfilter` subsystem. The `nft_payload_offload_mask()` function, which builds offload match masks for network packet header fields, contains a shift-out-of-bounds error. This occurs when processing partial IPv6 address matches, leading to an incorrect mask calculation and undefined behavior. This vulnerability could potentially result in a denial of service (DoS)."], "name": "CVE-2026-74579", "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"}], "public_date": "2026-08-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74579\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74579\nhttps://lore.kernel.org/linux-cve-announce/2026081757-CVE-2026-74579-6857@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d45bc0dc50f9dd83703510e9804d813a9cac32,b19b5d2e042c294e2cc1c908dc598f9d64015396)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d45bc0dc50f9dd83703510e9804d813a9cac32,a375d8ace807767f29f276b681b6324c74929b1d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d45bc0dc50f9dd83703510e9804d813a9cac32,16b553c46e347bc9de9946c4960654d5884a86de)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d45bc0dc50f9dd83703510e9804d813a9cac32,630295d5bba1d0e0f494cc459452eb0a0058c545)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a5d45bc0dc50f9dd83703510e9804d813a9cac32,39e88f28fb32bf02bd4b525c24c842c9cff5663d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[5.9.14,5.10)"}}], "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": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.151,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.103,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.44,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.8,7.1.*]"}}, {"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": "2026-08-17T06:30:04.440227+00:00", "updated": "2026-08-25T06:30:04.625957+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}