netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

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Summary

CVECVE-2026-23274
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 09:16:13 UTC
Updated2026-04-02 15:16:29 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 28c7cfaf0c0ab17cbd7754092116fd1af45271f9 git Not specified
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 54080355999381fed4a26129579a5765bab87491 git Not specified
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 5e7ece24c5cb75a60402aad4d803c7898ea40aa9 git Not specified
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 git Not specified
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 f228b9ae2a7e84d1153616d8e71c4236cb1f1309 git Not specified
CNA Linux Linux affected 68983a354a655c35d3fb204489d383a2a051fda7 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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