CVE-2026-23231

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-04. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between.

This creates two use-after-free conditions:

1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be walking the chain when the error path frees it.

2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nft_do_chain() via the transient IPv4 hook can still be dereferencing chain->blob_gen_X when the error path frees the chain.

Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
52.1%
KEV
Not listed

Published

March 4, 2026

Last Modified

July 14, 2026

Advisory Details (7)

Auto-updated Jun 5, 2026
No patch confirmed yet.
generic

SSA-253495

https://cert-portal.siemens.com/productcert/html/ssa-253495.html
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f3fe58ce37926a10115ede527d59b91bcc05400a
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dbd0af8083dd201f07c49110b2ee93710abdff28
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/71e99ee20fc3f662555118cf1159443250647533
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7017745068a9068904e1e7a1b170a5785647cc81
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b
generic

netfilter: nf_tables: fix use-after-free in nf_tables_addchain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2a6586ecfa4ce1413daaafee250d2590e05f1a33

Vendor Advisories for CVE-2026-23231(20)

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

Patch Availability(26)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-111.111) @ noble2026-06-12ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1014.14) @ questing2026-06-12ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1054.60) @ noble2026-06-12ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1054.60+fips1) @ noble2026-06-12ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1052.55.1) @ noble2026-06-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1023.23) @ noble2026-06-12ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-23.23~24.04.1) @ noble2026-06-12ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1020.20) @ noble2026-06-12ubuntu
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-0:4.18.0-372.188.1.el8_62026-04-22redhat
redhatkernel-0:5.14.0-70.175.1.el9_02026-04-22redhat
redhatkernel-0:5.14.0-284.166.1.el9_22026-04-22redhat
redhatkernel-rt-0:5.14.0-284.166.1.rt14.451.el9_22026-04-22redhat
redhatkernel-0:3.10.0-1160.148.1.el72026-04-22redhat
redhatkernel-0:4.18.0-477.136.1.el8_82026-04-22redhat
redhatkernel-rt-0:5.14.0-70.175.1.rt21.247.el9_02026-04-22redhat
redhatkernel-0:4.18.0-193.195.1.el8_22026-04-22redhat
redhatkernel-0:4.18.0-305.189.1.el8_42026-04-22redhat
redhatkernel-0:6.12.0-55.69.1.el10_02026-04-20redhat
redhatkernel-0:5.14.0-570.106.1.el9_62026-04-08redhat
redhatkernel-rt-0:4.18.0-553.117.1.rt7.458.el8_102026-04-06redhat
redhatkernel-0:5.14.0-611.47.1.el9_72026-04-06redhat
redhatkernel-0:4.18.0-553.117.1.el8_102026-04-06redhat
redhatkernel-0:6.12.0-124.47.1.el10_12026-03-30redhat

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 11× in last 7d / 50× 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 123 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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  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 09:02 UTCOSV refresh
  3. 2026-06-28 14:07 UTCEPSS rescore
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  5. 2026-06-28 04:56 UTCEPSS rescore
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  31. 2026-06-12 01:10 UTCEG score recompute
  32. 2026-06-12 01:10 UTCVendor advisory
  33. 2026-06-12 01:10 UTCGHSA enrichment
  34. 2026-06-11 14:00 UTCEPSS rescore
  35. 2026-06-10 22:18 UTCEPSS rescore
  36. 2026-06-10 20:12 UTCEG score recompute
  37. 2026-06-10 20:12 UTCVendor advisory
  38. 2026-06-10 20:12 UTCGHSA enrichment
  39. 2026-06-10 13:22 UTCEPSS rescore
  40. 2026-06-10 08:38 UTCEG score recompute
  41. 2026-06-10 08:38 UTCVendor advisory
  42. 2026-06-10 08:38 UTCGHSA enrichment
  43. 2026-06-09 18:03 UTCEG score recompute
  44. 2026-06-09 18:03 UTCVendor advisory
  45. 2026-06-09 18:03 UTCGHSA enrichment
  46. 2026-06-08 14:17 UTCEPSS rescore
  47. 2026-06-08 14:17 UTCEPSS rescore
  48. 2026-06-08 03:47 UTCEG score recompute
  49. 2026-06-08 03:47 UTCVendor advisory
  50. 2026-06-08 03:47 UTCGHSA enrichment
  51. 2026-06-07 16:13 UTCEG score recompute
  52. 2026-06-07 16:13 UTCVendor advisory
  53. 2026-06-07 16:13 UTCGHSA enrichment
  54. 2026-06-07 15:25 UTCEPSS rescore
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  56. 2026-06-06 13:47 UTCEPSS rescore
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  70. 2026-06-01 11:43 UTCOSV refresh
  71. 2026-05-31 22:30 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52549
    First seen May 4, 2026

    Linux nf_tables 6.19.3 - Local Privilege Escalation

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-23231?
CVE-2026-23231 is a high vulnerability published on March 4, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: fix use-after-free in nftables_addchain() nftablesaddchain() publishes the chain to table->chains via listaddtailrcu() (in nftchain_add()) before registering hooks. If nftablesregister_hook() then fails, the…
When was CVE-2026-23231 disclosed?
CVE-2026-23231 was first published in the National Vulnerability Database on March 4, 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-2026-23231 actively exploited?
CVE-2026-23231 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23231?
CVE-2026-23231 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-23231?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23231, 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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