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netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
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