CVE-2026-74480

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: bridge: stop fast-leave after deleting a port group

br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, continuing the loop advances pp through the deleted entry.

If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, br_port_group_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group.

Fast leave only needs to remove one matching port group. Break after br_multicast_del_pg() so the loop stops before dereferencing the removed entry.

CVSS v3
9.8
EG Score
9.8(medium)
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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (8)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d6c32e2e25a9a06ba021030e26b6d602a277eb72
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a39789f211b8a4125f0c70e05b30cf715f4f187d
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/482bcb85139addb4e8ac8ed10baeda3e0aad4031
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4695430e8132420bf8de94da3eb36a6cf35fde6b
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1a109cc9890d017c41d77e6c82da739579c49f0b
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/159ad90cb929c033308bb39a2c5f8fbf393b77aa
generic

net: bridge: stop fast-leave after deleting a port group - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0309ebbc570000ea0df11c06b69798e5860c5f6f

Vendor Advisories for CVE-2026-74480(9)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-09-19ubuntu
redhatkernel-0:6.12.0-231.19.el10nv2026-09-14redhat
redhatkernel-0:5.14.0-687.46.1.el9_82026-09-10redhat
redhatkernel-0:6.12.0-211.54.1.el10_22026-09-10redhat
redhatkernel-0:4.18.0-553.160.1.el8_102026-09-09redhat
redhatkernel-rt-0:4.18.0-553.160.1.rt7.501.el8_102026-09-08redhat
redhatkernel-0:3.10.0-1160.160.1.el72026-09-04redhat
redhatkernel-rt-0:3.10.0-1160.160.1.rt56.1312.el72026-09-04redhat
redhatkernel-0:5.14.0-570.138.1.el9_62026-09-02redhat
redhatkernel-0:6.12.0-55.102.1.el10_02026-09-02redhat
redhatkernel-rt-0:5.14.0-284.190.1.rt14.475.el9_22026-09-02redhat
redhatkernel-0:4.18.0-477.164.1.el8_82026-09-02redhat
redhatkernel-0:5.14.0-427.148.1.el9_42026-09-02redhat
redhatkernel-0:4.18.0-305.204.1.el8_42026-09-02redhat
redhatkernel-0:5.14.0-284.190.1.el9_22026-09-02redhat
redhatkernel-0:4.18.0-372.211.1.el8_62026-09-01redhat

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

(9)

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 83× in last 7d / 289× 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 329 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-74480?
CVE-2026-74480 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group brmulticastleave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After brmulticastdel_pg() removes p, continuing the loop advances pp through the…
When was CVE-2026-74480 disclosed?
CVE-2026-74480 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74480 actively exploited?
CVE-2026-74480 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.6% of all scored CVEs.
What is the CVSS score of CVE-2026-74480?
CVE-2026-74480 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74480?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74480, 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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