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: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 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

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (8)

Auto-updated Sep 30, 2026
Patch available.
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(11)

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

Patch Availability(17)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-05ubuntu
redhatkernel-0:6.12.0-259.26.el10nv2026-09-29redhat
redhatkernel-0:6.12.0-231.19.el10nv2026-09-14redhat
redhatkernel-0:6.12.0-211.54.1.el10_22026-09-10redhat
redhatkernel-0:5.14.0-687.46.1.el9_82026-09-10redhat
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-rt-0:3.10.0-1160.160.1.rt56.1312.el72026-09-04redhat
redhatkernel-0:3.10.0-1160.160.1.el72026-09-04redhat
redhatkernel-0:5.14.0-570.138.1.el9_62026-09-02redhat
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-rt-0:5.14.0-284.190.1.rt14.475.el9_22026-09-02redhat
redhatkernel-0:5.14.0-284.190.1.el9_22026-09-02redhat
redhatkernel-0:6.12.0-55.102.1.el10_02026-09-02redhat
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

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1
  • every version up to 6.12.107-1~deb12u1: fixed in 6.12.107-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (33 versions)
  • every version up to 6.12.105-1: fixed in 6.12.105-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (165 versions)
  • every version up to 7.1.8-1: fixed in 7.1.8-1
—

Additional Vendor Advisories

(8)

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 55× in last 7d / 301× 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 474 total refreshes for this CVE.

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

Related CVEs(same vendor)

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 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 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74480?
CVE-2026-74480 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74480?
A fix for CVE-2026-74480 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74480 are linked in the Vendor Advisories panel on this page.

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