netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels (Linux Linux)

CVE-2026-23274
HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.18 % · percentile 8 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type.

Weaknesses (CWE)

  • CWE-758 — Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

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 68983a354a655c35d3fb204489d383a2a051fda7 < 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 ; affected 68983a354a655c35d3fb204489d383a2a051fda7 < 144f88054ba0180467356f40895bd660b5dceeec ; affected 68983a354a655c35d3fb204489d383a2a051fda7 < 28c7cfaf0c0ab17cbd7754092116fd1af45271f9 ; affected 68983a354a655c35d3fb204489d383a2a051fda7 < 54080355999381fed4a26129579a5765bab87491 ; affected 68983a354a655c35d3fb204489d383a2a051fda7 < 5e7ece24c5cb75a60402aad4d803c7898ea40aa9 ; affected 68983a354a655c35d3fb204489d383a2a051fda7 < f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1
Linux · Linuxaffected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.253 ≤ 5.10.* ; unaffected 5.15.203 ≤ 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