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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.

PUBLISHED Reserved 2026-01-13 | Published 2026-03-20 | Updated 2026-05-11 | Assigner Linux




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 144f88054ba0180467356f40895bd660b5dceeec
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 28c7cfaf0c0ab17cbd7754092116fd1af45271f9
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 54080355999381fed4a26129579a5765bab87491
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 5e7ece24c5cb75a60402aad4d803c7898ea40aa9
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before f228b9ae2a7e84d1153616d8e71c4236cb1f1309
affected

68983a354a655c35d3fb204489d383a2a051fda7 (git) before 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf
affected

Default status
affected

5.7
affected

Any version before 5.7
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.167 (semver)
unaffected

6.6.130 (semver)
unaffected

6.12.78 (semver)
unaffected

6.18.19 (semver)
unaffected

6.19.9 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44

git.kernel.org/...c/144f88054ba0180467356f40895bd660b5dceeec

git.kernel.org/...c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9

git.kernel.org/...c/54080355999381fed4a26129579a5765bab87491

git.kernel.org/...c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9

git.kernel.org/...c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1

git.kernel.org/...c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309

git.kernel.org/...c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf

cve.org (CVE-2026-23274)

nvd.nist.gov (CVE-2026-23274)

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