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NVD / CVE Program· CNA Linux

CVE-2026-74746: netfilter: flowtable: publish GC-visible tuple last

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.53% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 0a00254585827f1695aa2700114af622ea754cfa, 2014ac62df9d45bb9a004a043e85df7be09ed780, 211ee5d998d92a7d548811939c65942d06c146e4; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a00254585827f1695aa2700114af622ea754cfa, 2014ac62df9d45bb9a004a043e85df7be09ed780, 211ee5d998d92a7d548811939c65942d06c146e4; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: flowtable: publish GC-visible tuple last nf_flow_table_iterate() only treats original-direction tuple nodes as owning entries. Publishing the original node first lets GC observe and free a flow while flow_offload_add() is still inserting the reply node. Publish the reply node first and the original node last so GC never sees a partially installed flow. KASAN can trigger slab-use-after-free read and write reports in the flowtable/rhashtable path (rht_deferred_worker, jhash, flow_offload_del, flow_offload_lookup, etc.).

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 26, 2026
Updated
Oct 16, 2026
EPSS
0.5% · 45th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-74746

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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

    • 4.16affected
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before 0a00254585827f1695aa2700114af622ea754cfaaffected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before be345dcbddb4643a54252b954af974b16eda8f91affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before 211ee5d998d92a7d548811939c65942d06c146e4affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before 972fdf7c4f5c282a239c88fea614b056c33dc025affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before d9d3050a70efe217e73a0751e55fdae6a7092620affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before d16b71231e65cb05daea2b45701fcf09cef041e7affected · git
    • ac2a66665e231847cab11b8c8e844ce43207dd2e and later · before 2014ac62df9d45bb9a004a043e85df7be09ed780affected · git
    • before 4.16not affected · 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 7.1.10-17.1.10-1
Red Hat:enterprise_linux_eus:10.0kernelbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64kbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-corebefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debugbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-corebefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-debuginfobefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-develbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-devel-matchedbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modulesbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modules-corebefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modules-extrabefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debuginfobefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-develbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-devel-matchedbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modulesbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modules-corebefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modules-extrabefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-abi-stablelistsbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-corebefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-debugbefore 0:6.12.0-55.108.1.el10_00:6.12.0-55.108.1.el10_0

+96

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-2026-74744Aug 26, 2026 · ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
    39Monitor
  • ← EarlierCVE-2026-74745Aug 26, 2026 · eth: bnxt: avoid deadlock when canceling IRQ affinity notifier
    30Monitor
  • Later →CVE-2026-74747Aug 26, 2026 · ipvs: revalidate ihl to prevent out-of-bounds access
    31Monitor

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 Linux0a00254585827f1695aa2700114af622ea754cfaVendor (CNA)
Linux Linux2014ac62df9d45bb9a004a043e85df7be09ed780Vendor (CNA)
Linux Linux211ee5d998d92a7d548811939c65942d06c146e4Vendor (CNA)
Linux Linux972fdf7c4f5c282a239c88fea614b056c33dc025Vendor (CNA)
Linux Linuxbe345dcbddb4643a54252b954af974b16eda8f91Vendor (CNA)
Linux Linuxd16b71231e65cb05daea2b45701fcf09cef041e7Vendor (CNA)
Linux Linuxd37917e7bebe078f3c17e47fd6fc1c9f6e8497b2Vendor (CNA)
Linux Linuxd9d3050a70efe217e73a0751e55fdae6a7092620Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-427.153.1.el9_4 · Red Hat:rhel_e4s:9.4::appstreamPackage 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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

—

CVSS vector

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