CVE-2026-74581

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: ipv6: clear suppressed fib6 rule result

fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info.

If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release().

Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 25, 2026

Advisory Details (8)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f
generic

net: ipv6: clear suppressed fib6 rule result - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc

Vendor Advisories for CVE-2026-74581(13)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:6.12.0-211.51.1.el10_22026-09-04redhat
redhatkernel-0:4.18.0-553.159.1.el8_102026-09-03redhat
redhatkernel-rt-0:4.18.0-553.159.1.rt7.500.el8_102026-09-03redhat
redhatkernel-0:6.12.0-55.102.1.el10_02026-09-02redhat
redhatkernel-0:4.18.0-477.163.1.el8_82026-09-01redhat
redhatkernel-0:5.14.0-284.189.1.el9_22026-08-27redhat
redhatkernel-0:5.14.0-570.136.1.el9_62026-08-27redhat
redhatkernel-0:5.14.0-427.147.1.el9_42026-08-27redhat
redhatkernel-0:4.18.0-372.209.1.el8_62026-08-27redhat
redhatkernel-rt-0:5.14.0-284.189.1.rt14.474.el9_22026-08-27redhat
redhatkernel-0:4.18.0-305.202.1.el8_42026-08-26redhat
redhatkernel-0:5.14.0-687.42.1.el9_82026-08-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)6.1.187-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.12.96-1 (33 versions)6.12.105-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (164 versions)7.1.8-1—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 94× in last 7d / 338× 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.

Showing the most recent 100 of 338 total refreshes for this CVE.

  1. 2026-09-19 05:31 UTCVendor advisory
  2. 2026-09-19 05:31 UTCGHSA enrichment
  3. 2026-09-19 01:34 UTCVendor advisory
  4. 2026-09-19 01:34 UTCGHSA enrichment
  5. 2026-09-18 21:37 UTCEG score recompute
  6. 2026-09-18 21:37 UTCVendor advisory
  7. 2026-09-18 21:37 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 17:10 UTCVendor advisory
  10. 2026-09-18 17:10 UTCGHSA enrichment
  11. 2026-09-18 13:06 UTCVendor advisory
  12. 2026-09-18 13:06 UTCGHSA enrichment
  13. 2026-09-18 09:07 UTCVendor advisory
  14. 2026-09-18 09:07 UTCGHSA enrichment
  15. 2026-09-18 05:10 UTCVendor advisory
  16. 2026-09-18 05:10 UTCGHSA enrichment
  17. 2026-09-18 01:13 UTCVendor advisory
  18. 2026-09-18 01:13 UTCGHSA enrichment
  19. 2026-09-17 21:16 UTCEG score recompute
  20. 2026-09-17 21:16 UTCVendor advisory
  21. 2026-09-17 21:16 UTCGHSA enrichment
  22. 2026-09-17 15:37 UTCVendor advisory
  23. 2026-09-17 15:37 UTCGHSA enrichment
  24. 2026-09-17 11:39 UTCVendor advisory
  25. 2026-09-17 11:39 UTCGHSA enrichment
Show 75 more
  1. 2026-09-17 07:35 UTCVendor advisory
  2. 2026-09-17 07:35 UTCGHSA enrichment
  3. 2026-09-17 03:38 UTCVendor advisory
  4. 2026-09-17 03:38 UTCGHSA enrichment
  5. 2026-09-16 23:41 UTCVendor advisory
  6. 2026-09-16 23:41 UTCGHSA enrichment
  7. 2026-09-16 19:43 UTCVendor advisory
  8. 2026-09-16 19:43 UTCGHSA enrichment
  9. 2026-09-16 15:46 UTCEG score recompute
  10. 2026-09-16 15:46 UTCVendor advisory
  11. 2026-09-16 15:46 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 11:39 UTCVendor advisory
  14. 2026-09-16 11:39 UTCGHSA enrichment
  15. 2026-09-16 07:39 UTCEG score recompute
  16. 2026-09-16 07:39 UTCVendor advisory
  17. 2026-09-16 07:39 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-16 03:41 UTCVendor advisory
  20. 2026-09-16 03:41 UTCGHSA enrichment
  21. 2026-09-15 23:44 UTCVendor advisory
  22. 2026-09-15 23:44 UTCGHSA enrichment
  23. 2026-09-15 19:47 UTCVendor advisory
  24. 2026-09-15 19:47 UTCGHSA enrichment
  25. 2026-09-15 15:37 UTCVendor advisory
  26. 2026-09-15 15:37 UTCGHSA enrichment
  27. 2026-09-15 11:38 UTCVendor advisory
  28. 2026-09-15 11:38 UTCGHSA enrichment
  29. 2026-09-15 07:41 UTCVendor advisory
  30. 2026-09-15 07:41 UTCGHSA enrichment
  31. 2026-09-15 03:43 UTCEG score recompute
  32. 2026-09-15 03:43 UTCVendor advisory
  33. 2026-09-15 03:43 UTCGHSA enrichment
  34. 2026-09-15 03:12 UTCEPSS rescore
  35. 2026-09-14 23:46 UTCVendor advisory
  36. 2026-09-14 23:46 UTCGHSA enrichment
  37. 2026-09-14 19:27 UTCVendor advisory
  38. 2026-09-14 19:27 UTCGHSA enrichment
  39. 2026-09-14 15:30 UTCVendor advisory
  40. 2026-09-14 15:30 UTCGHSA enrichment
  41. 2026-09-14 11:33 UTCVendor advisory
  42. 2026-09-14 11:33 UTCGHSA enrichment
  43. 2026-09-14 07:36 UTCVendor advisory
  44. 2026-09-14 07:36 UTCGHSA enrichment
  45. 2026-09-14 03:39 UTCVendor advisory
  46. 2026-09-14 03:39 UTCGHSA enrichment
  47. 2026-09-13 23:42 UTCVendor advisory
  48. 2026-09-13 23:42 UTCGHSA enrichment
  49. 2026-09-13 19:45 UTCEG score recompute
  50. 2026-09-13 19:45 UTCVendor advisory
  51. 2026-09-13 19:45 UTCGHSA enrichment
  52. 2026-09-13 15:48 UTCVendor advisory
  53. 2026-09-13 15:48 UTCGHSA enrichment
  54. 2026-09-13 11:50 UTCVendor advisory
  55. 2026-09-13 11:50 UTCGHSA enrichment
  56. 2026-09-13 07:53 UTCVendor advisory
  57. 2026-09-13 07:53 UTCGHSA enrichment
  58. 2026-09-13 03:56 UTCVendor advisory
  59. 2026-09-13 03:56 UTCGHSA enrichment
  60. 2026-09-12 23:58 UTCVendor advisory
  61. 2026-09-12 23:58 UTCGHSA enrichment
  62. 2026-09-12 20:00 UTCVendor advisory
  63. 2026-09-12 20:00 UTCGHSA enrichment
  64. 2026-09-12 16:02 UTCEG score recompute
  65. 2026-09-12 16:02 UTCVendor advisory
  66. 2026-09-12 16:02 UTCGHSA enrichment
  67. 2026-09-12 15:02 UTCEPSS rescore
  68. 2026-09-12 12:05 UTCVendor advisory
  69. 2026-09-12 12:05 UTCGHSA enrichment
  70. 2026-09-12 08:07 UTCVendor advisory
  71. 2026-09-12 08:07 UTCGHSA enrichment
  72. 2026-09-12 04:10 UTCVendor advisory
  73. 2026-09-12 04:10 UTCGHSA enrichment
  74. 2026-09-12 00:12 UTCVendor advisory
  75. 2026-09-12 00:12 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-74581?
CVE-2026-74581 is a critical vulnerability published on August 21, 2026. In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6rulesuppress() drops a suppressed route with ip6rtput_flags(), but leaves res->rt6 pointing at the released rt6_info. If no later rule supplies a replacement, fib6rulelookup() still…
When was CVE-2026-74581 disclosed?
CVE-2026-74581 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74581 actively exploited?
CVE-2026-74581 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.1% of all scored CVEs.
What is the CVSS score of CVE-2026-74581?
CVE-2026-74581 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74581, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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