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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98625: netfilter: flowtable: publish HW_DEAD after worker is done

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 00e452a7ca9fda135ea3d04a11128d5088e354a8, 56f39c7d139bb76072efe2fb3dcafc13ba915ad8, b0ef9450e93f2adeb77593db14c2ac7c6c8f5060; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00e452a7ca9fda135ea3d04a11128d5088e354a8, 56f39c7d139bb76072efe2fb3dcafc13ba915ad8, b0ef9450e93f2adeb77593db14c2ac7c6c8f5060; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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 HW_DEAD after worker is done flow_offload_work_del() sets NF_FLOW_HW_DEAD before the work handler clears NF_FLOW_HW_PENDING. Once a flow is both HW_DYING and HW_DEAD, a concurrent garbage collection pass can remove it and schedule it for RCU freeing. The offload worker holds neither an RCU read lock nor a reference to the flow. If it is preempted after publishing HW_DEAD, the RCU callback can free the flow before the worker resumes and clears HW_PENDING, resulting in a use-after-free. Move HW_DEAD publication to the common worker epilogue after the pending bit is cleared, making it the final flow access by destroy work. Order all preceding flow accesses before publishing the bit that allows garbage collection to free the object.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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

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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

    • 5.7affected
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before f92e8f39726ba68a7c42c6b7566be687c8161579affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before 00e452a7ca9fda135ea3d04a11128d5088e354a8affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before 56f39c7d139bb76072efe2fb3dcafc13ba915ad8affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before e20701843032c438f879066a77ea85e361c6b999affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before b4f0f05dfbe836a171bff261f17d098a4d5461eaaffected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before b0ef9450e93f2adeb77593db14c2ac7c6c8f5060affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before f26652e99f519e6bd34f8a9b48fbb33c603585f2affected · git
    • 2c8897953f3b2ff5498f3f275708a742bfcdbc24 and later · before d644b23afe1ef509c9961a6d84a093c2587edf02affected · git
    • before 5.7not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

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-2026-98623Oct 18, 2026 · drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update
    0Monitor
  • ← EarlierCVE-2026-98624Oct 18, 2026 · netfilter: nfnetlink_queue: hold nfnl mutex in event notifier
    0Monitor
  • Later →CVE-2026-98626Oct 18, 2026 · bpf: Restrict CO-RE poisoning to relocatable instructions
    0Monitor

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 Linux00e452a7ca9fda135ea3d04a11128d5088e354a8Vendor (CNA)
Linux Linux56f39c7d139bb76072efe2fb3dcafc13ba915ad8Vendor (CNA)
Linux Linuxb0ef9450e93f2adeb77593db14c2ac7c6c8f5060Vendor (CNA)
Linux Linuxb4f0f05dfbe836a171bff261f17d098a4d5461eaVendor (CNA)
Linux Linuxd644b23afe1ef509c9961a6d84a093c2587edf02Vendor (CNA)
Linux Linuxe20701843032c438f879066a77ea85e361c6b999Vendor (CNA)
Linux Linuxf26652e99f519e6bd34f8a9b48fbb33c603585f2Vendor (CNA)
Linux Linuxf92e8f39726ba68a7c42c6b7566be687c8161579Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 7, 2026+20 d
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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Exploit maturity— → 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