CVE-2026-97609

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-25. A secondary CVSS source baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.0EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.0Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: cttimeout: prevent UAF during module unload

nf_ct_set_timeout() protects the timeout hook dereference and policy lookup with rcu_read_lock(). cttimeout_exit(), however, unregisters the per-net operations before it clears the hook.

This allows the following interleaving:

CPU 0 CPU 1 cttimeout_exit() nf_ct_set_timeout() unregister_pernet_subsys() rcu_read_lock() kfree(pernet) h = nf_ct_timeout_hook h->timeout_find_get() nfct_timeout_pernet()

The hook still points to ctnl_timeout_find_get() when CPU 1 looks up the already freed per-net timeout list. KASAN reported:

BUG: KASAN: slab-use-after-free in ctnl_timeout_find_get Read of size 8 by task poc/90 Call Trace: ctnl_timeout_find_get+0x271/0x2a0 [nfnetlink_cttimeout] nf_ct_set_timeout+0x7b/0x3c0 xt_ct_tg_check+0x724/0xb20 xt_check_target+0x234/0xa90 do_ipt_set_ctl+0x570/0x1270 Allocated by task 89: __kmalloc_noprof+0x16e/0x460 ops_init+0x6d/0x420 register_pernet_operations+0x2f6/0x670 Freed by task 91: kfree+0x131/0x390 ops_undo_list+0x3d4/0x730 unregister_pernet_operations+0x232/0x490 unregister_pernet_subsys+0x1c/0x30 cttimeout_exit+0x52/0x970 [nfnetlink_cttimeout]

Clear the hook and wait for existing readers before unregistering the per-net operations. This blocks new policy lookups and ensures readers that observed the hook finish before the per-net storage is freed.

CVSS v3
7.0
EG Score
7.0HIGHhigh confidence
EG Risk
36
EG Risk 36/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity70% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

October 3, 2026

Advisory Details (3)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

netfilter: cttimeout: prevent UAF during module unload - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643
generic

netfilter: cttimeout: prevent UAF during module unload - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1
generic

netfilter: cttimeout: prevent UAF during module unload - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221

Vendor Advisories for CVE-2026-97609(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (183 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (180 versions)
  • every version up to 7.2.7-1: fixed in 7.2.7-1
—

Data Freshness Timeline

(refreshed 46× in last 7d / 66× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 07:40 UTCEG score recompute
  2. 2026-10-05 07:40 UTCVendor advisory
  3. 2026-10-05 07:40 UTCGHSA enrichment
  4. 2026-10-04 23:23 UTCEPSS rescore
  5. 2026-10-04 20:36 UTCVendor advisory
  6. 2026-10-04 20:36 UTCGHSA enrichment
  7. 2026-10-04 09:33 UTCVendor advisory
  8. 2026-10-04 09:33 UTCGHSA enrichment
  9. 2026-10-03 22:29 UTCEG score recompute
  10. 2026-10-03 22:29 UTCVendor advisory
  11. 2026-10-03 22:28 UTCGHSA enrichment
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-03 11:22 UTCEG score recompute
  14. 2026-10-03 11:22 UTCVendor advisory
  15. 2026-10-03 11:22 UTCGHSA enrichment
  16. 2026-10-03 00:58 UTCEG score recompute
  17. 2026-10-03 00:58 UTCVendor advisory
  18. 2026-10-03 00:58 UTCGHSA enrichment
  19. 2026-10-02 17:57 UTCEPSS rescore
  20. 2026-10-02 13:55 UTCVendor advisory
  21. 2026-10-02 13:55 UTCGHSA enrichment
  22. 2026-10-02 02:52 UTCEG score recompute
  23. 2026-10-02 02:52 UTCVendor advisory
  24. 2026-10-02 02:51 UTCGHSA enrichment
  25. 2026-10-01 19:51 UTCEPSS rescore
Show 41 more
  1. 2026-10-01 15:46 UTCVendor advisory
  2. 2026-10-01 15:46 UTCGHSA enrichment
  3. 2026-10-01 04:42 UTCVendor advisory
  4. 2026-10-01 04:42 UTCGHSA enrichment
  5. 2026-09-30 17:34 UTCEG score recompute
  6. 2026-09-30 17:34 UTCVendor advisory
  7. 2026-09-30 17:34 UTCGHSA enrichment
  8. 2026-09-30 15:04 UTCEPSS rescore
  9. 2026-09-30 06:30 UTCVendor advisory
  10. 2026-09-30 06:30 UTCGHSA enrichment
  11. 2026-09-29 19:27 UTCEG score recompute
  12. 2026-09-29 19:27 UTCVendor advisory
  13. 2026-09-29 19:27 UTCGHSA enrichment
  14. 2026-09-29 08:17 UTCEG score recompute
  15. 2026-09-29 08:17 UTCVendor advisory
  16. 2026-09-29 08:17 UTCGHSA enrichment
  17. 2026-09-28 21:14 UTCEG score recompute
  18. 2026-09-28 21:14 UTCVendor advisory
  19. 2026-09-28 21:14 UTCGHSA enrichment
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 10:10 UTCVendor advisory
  23. 2026-09-28 10:10 UTCGHSA enrichment
  24. 2026-09-27 23:06 UTCEG score recompute
  25. 2026-09-27 23:06 UTCGHSA enrichment
  26. 2026-09-27 13:49 UTCEPSS rescore
  27. 2026-09-27 12:02 UTCGHSA enrichment
  28. 2026-09-27 00:58 UTCEG score recompute
  29. 2026-09-27 00:58 UTCGHSA enrichment
  30. 2026-09-26 15:59 UTCEPSS rescore
  31. 2026-09-26 13:54 UTCGHSA enrichment
  32. 2026-09-26 02:28 UTCEG score recompute
  33. 2026-09-26 02:28 UTCGHSA enrichment
  34. 2026-09-25 15:24 UTCEG score recompute
  35. 2026-09-25 15:24 UTCGHSA enrichment
  36. 2026-09-25 14:52 UTCEG score recompute▲ 7.00
  37. 2026-09-25 14:52 UTCGHSA enrichment
  38. 2026-09-25 14:49 UTCMITRE cvelistV5CVSS v3 → 7 · severity → HIGH
  39. 2026-09-25 11:29 UTCNVD update
  40. 2026-09-25 10:38 UTCEG score recompute
  41. 2026-09-25 10:27 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-97609?
CVE-2026-97609 is a high vulnerability published on September 25, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: cttimeout: prevent UAF during module unload nfctset_timeout() protects the timeout hook dereference and policy lookup with rcureadlock(). cttimeout_exit(), however, unregisters the per-net operations before it clears the…
When was CVE-2026-97609 disclosed?
CVE-2026-97609 was first published on September 25, 2026, with the most recent update on October 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-97609 actively exploited?
CVE-2026-97609 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97609?
CVE-2026-97609 has a CVSS base score of 7.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-97609?
No fix for CVE-2026-97609 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-97609 are linked in the Vendor Advisories panel on this page.

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