CVE-2026-23204

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-02-14. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

A fix is available — apply it.

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

net/sched: cls_u32: use skb_header_pointer_careful()

skb_header_pointer() does not fully validate negative @offset values.

Use skb_header_pointer_careful() instead.

GangMin Kim provided a report and a repro fooling u32_classify():

BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
2.4%
KEV
Not listed

Published

February 14, 2026

Last Modified

July 14, 2026

Advisory Details (7)

Auto-updated Jul 4, 2026
No patch confirmed yet.
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c
generic

net/sched: cls_u32: use skb_header_pointer_careful() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5

Vendor Advisories for CVE-2026-23204(19)

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

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-fips-6.8 (6.8.0-116.116+fips1) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1024.24) @ noble2026-06-12ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1056.62) @ noble2026-06-12ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-06-12ubuntu
ubuntulinux-virtual-6.8 (6.8.0-117.117) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1054.57~22.04.1) @ jammy2026-06-12ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1054.57.1) @ noble2026-06-12ubuntu
redhatkernel-0:5.14.0-687.10.1.el9_82026-05-20redhat
redhatkernel-rt-0:3.10.0-1160.148.1.rt56.1300.el72026-04-27redhat
redhatkernel-0:5.14.0-427.121.1.el9_42026-04-23redhat
redhatkernel-0:3.10.0-1160.148.1.el72026-04-22redhat
redhatkernel-0:4.18.0-193.195.1.el8_22026-04-22redhat
redhatkernel-rt-0:5.14.0-70.175.1.rt21.247.el9_02026-04-22redhat
redhatkernel-0:5.14.0-284.166.1.el9_22026-04-22redhat
redhatkernel-0:4.18.0-305.189.1.el8_42026-04-22redhat
redhatkernel-0:4.18.0-477.136.1.el8_82026-04-22redhat
redhatkernel-rt-0:5.14.0-284.166.1.rt14.451.el9_22026-04-22redhat
redhatkernel-0:4.18.0-372.188.1.el8_62026-04-22redhat
redhatkernel-0:5.14.0-70.175.1.el9_02026-04-22redhat
redhatkernel-0:5.14.0-570.108.1.el9_62026-04-20redhat
redhatkernel-0:6.12.0-55.68.1.el10_02026-04-15redhat
redhatkernel-0:6.12.0-124.49.1.el10_12026-04-06redhat
redhatkernel-0:5.14.0-611.45.1.el9_72026-03-30redhat
redhatkernel-0:4.18.0-553.115.1.el8_102026-03-30redhat
redhatkernel-rt-0:4.18.0-553.115.1.rt7.456.el8_102026-03-30redhat

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(7)

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 9× in last 7d / 44× 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 119 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
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  23. 2026-06-29 13:02 UTCOSV refresh
  24. 2026-06-28 14:07 UTCEPSS rescore
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  1. 2026-06-27 03:08 UTCEPSS rescore
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  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-12 03:31 UTCEG score recompute
  26. 2026-06-12 03:31 UTCVendor advisory
  27. 2026-06-12 03:31 UTCGHSA enrichment
  28. 2026-06-11 14:00 UTCEPSS rescore
  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 21:47 UTCEG score recompute
  31. 2026-06-10 21:47 UTCVendor advisory
  32. 2026-06-10 21:47 UTCGHSA enrichment
  33. 2026-06-10 13:22 UTCEPSS rescore
  34. 2026-06-10 09:35 UTCEG score recompute
  35. 2026-06-10 09:35 UTCVendor advisory
  36. 2026-06-10 09:35 UTCGHSA enrichment
  37. 2026-06-09 19:43 UTCEG score recompute
  38. 2026-06-09 19:43 UTCVendor advisory
  39. 2026-06-09 19:43 UTCGHSA enrichment
  40. 2026-06-08 14:17 UTCEPSS rescore
  41. 2026-06-08 14:17 UTCEPSS rescore
  42. 2026-06-08 06:00 UTCEG score recompute
  43. 2026-06-08 06:00 UTCVendor advisory
  44. 2026-06-08 06:00 UTCGHSA enrichment
  45. 2026-06-07 17:52 UTCEG score recompute
  46. 2026-06-07 17:52 UTCVendor advisory
  47. 2026-06-07 17:52 UTCGHSA enrichment
  48. 2026-06-07 15:25 UTCEPSS rescore
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  50. 2026-06-06 13:47 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-23204?
CVE-2026-23204 is a high vulnerability published on February 14, 2026. In the Linux kernel, the following vulnerability has been resolved: net/sched: clsu32: use skbheaderpointercareful() skbheaderpointer() does not fully validate negative @offset values. Use skbheaderpointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG:…
When was CVE-2026-23204 disclosed?
CVE-2026-23204 was first published in the National Vulnerability Database on February 14, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23204 actively exploited?
CVE-2026-23204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23204?
CVE-2026-23204 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-23204?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23204, 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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