CVE-2026-23204

HIGHNVD 7.17.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.1Exploit: None knownExposed services: Not assessed

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
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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 (value × EchelonGraph’s weight)
Severity71% × 45%
The EG Score, 7.1 of 10.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 14, 2026

Last Modified

October 15, 2026

Advisory Details (7)

Auto-updated Jul 4, 2026
Patch available.
Web page

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
Web page

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
Web page

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
Web page

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
Web page

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
Web page

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
Web page

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

Patch Availability(31)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1054.57~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1056.62) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1059.65+fips1) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1059.65~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-08ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-08ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-08ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-08ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-08ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-08ubuntu
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-rt-0:4.18.0-553.115.1.rt7.456.el8_102026-03-30redhat
redhatkernel-0:5.14.0-611.45.1.el9_72026-03-30redhat
redhatkernel-0:4.18.0-553.115.1.el8_102026-03-30redhat
linuxKernel @ 5.10.260 (fixes >=2.6.35)—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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)
  • every version up to 5.10.262-1: fixed in 5.10.262-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)
  • every version up to 6.1.170-1~deb11u1: fixed in 6.1.170-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)
  • every version up to 6.1.170-1: fixed in 6.1.170-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.73-1~bpo12+1 (12 versions)
  • every version up to 6.12.73-1: fixed in 6.12.73-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (100 versions)
  • every version up to 6.18.10-1: fixed in 6.18.10-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(7)

Data Freshness Timeline

(refreshed 15× in last 7d / 32× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 237 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 138 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 02:38 UTCVendor advisory
  2. 2026-10-15 02:37 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  3. 2026-10-15 01:41 UTCEG score recompute
  4. 2026-10-15 01:41 UTCVendor advisory
  5. 2026-10-15 01:40 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  6. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-12 16:21 UTCEG score recompute
  10. 2026-10-11 20:03 UTCEG score recompute
  11. 2026-10-11 17:16 UTCEG score recompute
  12. 2026-10-11 14:48 UTCEG score recompute
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-09-28 01:19 UTCOSV refresh
  25. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
Show 74 more
  1. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-08 09:19 UTCEG score recompute
  14. 2026-09-08 09:19 UTCVendor advisory
  15. 2026-09-08 09:18 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-08-31 18:34 UTCOSV refresh
  22. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  27. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  28. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  29. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  31. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  34. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  35. 2026-08-14 22:31 UTCVendor advisory
  36. 2026-08-14 22:31 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  37. 2026-08-14 10:01 UTCEG score recompute
  38. 2026-08-14 10:01 UTCVendor advisory
  39. 2026-08-14 10:01 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  40. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  41. 2026-08-13 02:20 UTCEG score recompute
  42. 2026-08-13 02:20 UTCVendor advisory
  43. 2026-08-13 02:20 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  44. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-08-11 07:52 UTCEG score recompute
  47. 2026-08-11 07:52 UTCVendor advisory
  48. 2026-08-11 07:52 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  49. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  50. 2026-08-10 02:55 UTCVendor advisory
  51. 2026-08-10 02:55 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  52. 2026-08-09 14:35 UTCEG score recompute
  53. 2026-08-09 14:35 UTCVendor advisory
  54. 2026-08-09 14:35 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  55. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  56. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-08-08 10:00 UTCVendor advisory
  58. 2026-08-08 10:00 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  59. 2026-08-07 21:54 UTCEG score recompute
  60. 2026-08-07 21:54 UTCVendor advisory
  61. 2026-08-07 21:54 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  62. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  63. 2026-08-06 03:46 UTCEG score recompute
  64. 2026-08-06 03:46 UTCVendor advisory
  65. 2026-08-06 03:46 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  66. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  67. 2026-08-05 12:45 UTCEG score recompute
  68. 2026-08-05 12:45 UTCVendor advisory
  69. 2026-08-05 12:45 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1
  70. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  71. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  72. 2026-08-02 20:32 UTCEG score recompute
  73. 2026-08-02 20:32 UTCVendor advisory
  74. 2026-08-02 20:32 UTCGHSA enrichmentGHSA-rf63-9f5h-hhg6 · GitHub severity HIGH · GitHub CVSS 7.1

Frequently asked(5)

What is CVE-2026-23204?
CVE-2026-23204 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-23204 published?
The CVE record for CVE-2026-23204 was published on February 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 15, 2026; the record at its source may have been updated since.
Is CVE-2026-23204 actively exploited?
CVE-2026-23204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-23204 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-23204 are linked in the Vendor Advisories panel on this page.

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