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CVE-2026-74579 (GCVE-0-2026-74579)

Vulnerability from cvelistv5 – Published: 2026-08-17 05:28 – Updated: 2026-08-25 05:40
VLAI
Title
netfilter: nft_payload: fix mask build for partial field offload
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: fix mask build for partial field offload nft_payload_offload_mask() builds the offload match mask for a payload expression that covers only part of a header field. For a partial IPv6 address match (field_len = 16, priv_len = 1) that shift is 1 << 120, which is undefined on the 32-bit int operand. It also trims only one word, so the remaining words stay 0xffffffff (and when priv_len is a multiple of 4 the trim is skipped entirely), leaving the mask covering more bytes than the rule matches. UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20 shift exponent 120 is too large for 32-bit type 'int' ... The match is byte-granular and struct nft_data is zero-initialised, so the correct mask is simply the first priv_len bytes set to 0xff. Set those bytes directly and drop the word/shift trimming; this removes the undefined shift and no longer over-masks the trailing bytes.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7 (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 8720df4504e0ed1781a702f65251bd47b3534d5e (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 363c3a84a946d53e5e121c9f47c7c2b7d228c46b (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < b19b5d2e042c294e2cc1c908dc598f9d64015396 (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < a375d8ace807767f29f276b681b6324c74929b1d (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 16b553c46e347bc9de9946c4960654d5884a86de (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 630295d5bba1d0e0f494cc459452eb0a0058c545 (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 39e88f28fb32bf02bd4b525c24c842c9cff5663d (git)
Affected: 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 (git)
Affected: 5.9.14 , < 5.10 (semver)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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        {
          "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 \u003c\u003c 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 \u0027int\u0027\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."
        }
      ],
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        {
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            "version": "3.1"
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              "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\u003c\u003c120) 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."
            }
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        {
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      "title": "netfilter: nft_payload: fix mask build for partial field offload",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74579",
    "datePublished": "2026-08-17T05:28:27.768Z",
    "dateReserved": "2026-08-15T05:44:03.917Z",
    "dateUpdated": "2026-08-25T05:40:05.144Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-74579",
      "date": "2026-09-10",
      "epss": "0.0012",
      "percentile": "0.02072"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:57:24.000Z",
      "cve": "CVE-2026-74579",
      "id": "msrc_CVE-2026-74579",
      "initial_release_date": "2026-08-20T21:58:42.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: nft_payload: fix mask build for partial field offload",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74579.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74579\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-17T06:19:56.417\",\"lastModified\":\"2026-08-25T06:18:30.677\",\"vulnStatus\":\"Received\",\"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 \u003c\u003c 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 \u0027int\u0027\\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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nft_payload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nft_payload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-25T10:02:53+00:00",
      "cve": "CVE-2026-74579",
      "id": "CVE-2026-74579",
      "initial_release_date": "2026-08-17T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_payload: fix mask build for partial field offload",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74579.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-18T16:53:21Z",
      "cve": "CVE-2026-74579",
      "id": "CVE-2026-74579",
      "initial_release_date": "2026-08-18T16:53:21Z",
      "product_status:known_affected": "209",
      "product_status:known_not_affected": "75",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74579",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74579.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.