netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
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.
CVE-2026-23274
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23274
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "144f88054ba0180467356f40895bd660b5dceeec",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "28c7cfaf0c0ab17cbd7754092116fd1af45271f9",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "54080355999381fed4a26129579a5765bab87491",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "5e7ece24c5cb75a60402aad4d803c7898ea40aa9",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "f228b9ae2a7e84d1153616d8e71c4236cb1f1309",
"versionType": "git"
},
{
"status": "affected",
"version": "68983a354a655c35d3fb204489d383a2a051fda7",
"lessThan": "329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/xt_IDLETIMER.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/xt_IDLETIMER.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23274
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39833 · Revision 1
- Added to Heist Feed
- Publisher date