CVE-2026-23274

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-20. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer.

If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1.

Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

March 20, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9
generic

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec

Vendor Advisories for CVE-2026-23274(3)

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

Patch Availability(20)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-117.117) @ noble2026-06-11ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-29.29) @ questing2026-06-11ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.179.163) @ jammy2026-06-11ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1054.57.1) @ noble2026-06-11ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1099.103) @ jammy2026-06-11ubuntu
ubuntulinux-tools-oracle-edge (6.17.0-1014.14~24.04.1) @ noble2026-06-11ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.178.188~20.04.1) @ focal2026-06-11ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-116.116+fips1) @ noble2026-06-11ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1108.117~20.04.1) @ focal2026-06-11ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.178.150) @ jammy2026-06-11ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1024.24) @ noble2026-06-11ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1049.51) @ jammy2026-06-11ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1054.57~22.04.1) @ jammy2026-06-11ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1056.62) @ noble2026-06-11ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1015.15) @ questing2026-06-11ubuntu
ubuntulinux-tools-gcp-edge (6.17.0-1018.19~24.04.1) @ noble2026-06-11ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-06-11ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1114.99) @ jammy2026-06-11ubuntu
linuxKernel @ 5.10.253—osv
linuxKernel @ 6.1.167—osv

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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (119 versions)6.19.10-1—

Additional Vendor Advisories

(24)

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 7× in last 7d / 56× 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 212 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-23274?
CVE-2026-23274 is a high vulnerability published on March 20, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with…
When was CVE-2026-23274 disclosed?
CVE-2026-23274 was first published in the National Vulnerability Database on March 20, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23274 actively exploited?
CVE-2026-23274 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 93.8% of all scored CVEs.
What is the CVSS score of CVE-2026-23274?
CVE-2026-23274 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-23274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23274, 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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