netfilter: nf_tables: release flowtable after rcu grace period on error (Linux Linux)

CVE-2026-23392
HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.17 % · percentile 6 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.

Weaknesses (CWE)

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < 29538fb3f412f3ce5ad9f97fe7fd84952dacd3af ; affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < ec0f801e5ce0162fc4fea95607c716b264d283fb ; affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < d2632de96ccb066e0131ad1494241b9c281c60b8 ; affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < adee3436ccd29f1e514c028899e400cbc6d84065 ; affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < 7e3955b282eae20d61c75e499c75eade51c20060 ; affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 < c8092edb9a11f20f95ccceeb9422b7dd0df337bd
Linux · Linuxaffected 4.16 ; unaffected 0 < 4.16 ; unaffected 5.10.273 ≤ 5.10.* ; unaffected 5.15.224 ≤ 5.15.* ; unaffected 6.1.167 ≤ 6.1.* ; unaffected 6.6.130 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD