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NVD / CVE Program· CNA Linux

CVE-2026-74579: netfilter: nft_payload: fix mask build for partial field offload

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 16b553c46e347bc9de9946c4960654d5884a86de, 363c3a84a946d53e5e121c9f47c7c2b7d228c46b, 39e88f28fb32bf02bd4b525c24c842c9cff5663d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 16b553c46e347bc9de9946c4960654d5884a86de, 363c3a84a946d53e5e121c9f47c7c2b7d228c46b, 39e88f28fb32bf02bd4b525c24c842c9cff5663d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Aug 17, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5c2b4b4f9fa5b765b927e361e3d310bcb5773015, 5.10affected
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7affected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 8720df4504e0ed1781a702f65251bd47b3534d5eaffected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 363c3a84a946d53e5e121c9f47c7c2b7d228c46baffected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before b19b5d2e042c294e2cc1c908dc598f9d64015396affected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before a375d8ace807767f29f276b681b6324c74929b1daffected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 16b553c46e347bc9de9946c4960654d5884a86deaffected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 630295d5bba1d0e0f494cc459452eb0a0058c545affected · git
    • a5d45bc0dc50f9dd83703510e9804d813a9cac32 and later · before 39e88f28fb32bf02bd4b525c24c842c9cff5663daffected · git
    • 5.9.14 and later · before 5.10affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74577Aug 15, 2026 · net: mpls: initialize rtm_tos in mpls_getroute()
    0Monitor
  • ← EarlierCVE-2026-74578Aug 16, 2026 · crypto: algif_skcipher - force synchronous processing on trees without ctx->state
    28Monitor
  • Later →CVE-2026-74580Aug 21, 2026 · vhost: reset the vring metadata cache on vring reconfiguration
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux16b553c46e347bc9de9946c4960654d5884a86deVendor (CNA)
Linux Linux363c3a84a946d53e5e121c9f47c7c2b7d228c46bVendor (CNA)
Linux Linux39e88f28fb32bf02bd4b525c24c842c9cff5663dVendor (CNA)
Linux Linux3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7Vendor (CNA)
Linux Linux5.10Vendor (CNA)
Linux Linux630295d5bba1d0e0f494cc459452eb0a0058c545Vendor (CNA)
Linux Linux8720df4504e0ed1781a702f65251bd47b3534d5eVendor (CNA)
Linux Linuxa375d8ace807767f29f276b681b6324c74929b1dVendor (CNA)
Linux Linuxb19b5d2e042c294e2cc1c908dc598f9d64015396Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records