CVE-2026-23270

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-18. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

As Paolo said earlier [1]:

"Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet."

act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact).

[1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/[email protected]/

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
2.6%
KEV
Not listed

Published

March 18, 2026

Last Modified

July 14, 2026

Advisory Details (7)

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

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fb3c380a54e33d1fd272cc342faa906d787d7ef1
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc4e5bb529823a09f02dbe96169de679a9db26e0
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9deda0fcda5c1f388c5e279541850b71a2ccfcf4
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5a110ddcc99bda77a28598b3555fe009eaab3828
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/524ce8b4ea8f64900b6c52b6a28df74f6bc0801e
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6
generic

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/11cb63b0d1a0685e0831ae3c77223e002ef18189

Vendor Advisories for CVE-2026-23270(13)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:6.12.0-55.77.1.el10_02026-06-08redhat
redhatkernel-0:5.14.0-570.119.1.el9_62026-06-04redhat
redhatkernel-0:5.14.0-284.174.1.el9_22026-06-03redhat
redhatkernel-rt-0:5.14.0-284.174.1.rt14.459.el9_22026-06-03redhat
redhatkernel-0:4.18.0-553.126.1.el8_102026-05-28redhat
redhatkernel-rt-0:4.18.0-553.126.1.rt7.467.el8_102026-05-28redhat
redhatkernel-0:5.14.0-427.127.1.el9_42026-05-27redhat
redhatkernel-0:6.12.0-211.16.1.el10_22026-05-20redhat
redhatkernel-0:5.14.0-687.10.1.el9_82026-05-20redhat
redhatkernel-0:5.14.0-611.54.1.el9_72026-05-04redhat
redhatkernel-0:6.12.0-124.55.1.el10_12026-05-04redhat
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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 42× 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 117 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
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  11. 2026-07-06 16:27 UTCEPSS rescore
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  19. 2026-06-29 06:02 UTCOSV refresh
  20. 2026-06-28 14:07 UTCEPSS rescore
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  22. 2026-06-28 04:56 UTCEPSS rescore
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  24. 2026-06-27 03:08 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  22. 2026-06-12 23:12 UTCEPSS rescore
  23. 2026-06-11 23:47 UTCEG score recompute
  24. 2026-06-11 23:47 UTCVendor advisory
  25. 2026-06-11 23:47 UTCGHSA enrichment
  26. 2026-06-11 14:00 UTCEPSS rescore
  27. 2026-06-10 22:18 UTCEPSS rescore
  28. 2026-06-10 18:39 UTCEG score recompute
  29. 2026-06-10 18:39 UTCVendor advisory
  30. 2026-06-10 18:39 UTCGHSA enrichment
  31. 2026-06-10 13:22 UTCEPSS rescore
  32. 2026-06-10 05:47 UTCEG score recompute
  33. 2026-06-10 05:47 UTCVendor advisory
  34. 2026-06-10 05:47 UTCGHSA enrichment
  35. 2026-06-09 16:33 UTCEG score recompute
  36. 2026-06-09 16:33 UTCVendor advisory
  37. 2026-06-09 16:33 UTCGHSA enrichment
  38. 2026-06-08 14:17 UTCEPSS rescore
  39. 2026-06-08 14:17 UTCEPSS rescore
  40. 2026-06-08 03:16 UTCEG score recompute
  41. 2026-06-08 03:16 UTCVendor advisory
  42. 2026-06-08 03:16 UTCGHSA enrichment
  43. 2026-06-07 15:25 UTCEPSS rescore
  44. 2026-06-07 15:24 UTCEPSS rescore
  45. 2026-06-07 14:25 UTCEG score recompute
  46. 2026-06-07 14:25 UTCVendor advisory
  47. 2026-06-07 14:25 UTCGHSA enrichment
  48. 2026-06-06 13:47 UTCEPSS rescore
  49. 2026-06-06 13:47 UTCEPSS rescore
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  51. 2026-06-05 22:47 UTCEPSS rescore
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  62. 2026-06-01 08:43 UTCOSV refresh
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-23270?
CVE-2026-23270 is a high vulnerability published on March 18, 2026. In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TCACTCONSUMED while the current skb being held by the defragmentation…
When was CVE-2026-23270 disclosed?
CVE-2026-23270 was first published in the National Vulnerability Database on March 18, 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-2026-23270 actively exploited?
CVE-2026-23270 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23270?
CVE-2026-23270 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-23270?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23270, 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.

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