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net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry In a case where skb with an unconfirmed ct entry gets cloned, we may end up committing both but with different sets of extensions. The series of events: 1. The first clone wants to commit and runs the helpers wiring up the extension pointer into the expectation list. 2. Then it looses the confirmation keeping the entry unconfirmed. 3. Second clone now wants to commit labels and adds the new extension for that breaking the pointer in the expectation list causing UAF on the destruction path later. While this is possible to trigger, there should be no practical network pipeline where committing both clones without modifications into the same zone is needed. So, let's just reset the entry in case for some reason we got an skb with a shared one during commit. This doesn't affect any known use cases, but avoids any potential problems with sharing and modification of the unconfirmed ct entry. The fixes tag points to the introduction of helpers, since that's the main UAF trigger for the sharing.

Announced Source revision 1
Original source ↗

CVE-2026-98491

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-2026-98491

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": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "37e3c878b183a115f9a114067f9ef3b408ad27fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "707c2dc77891a874f4e8c52c285a511079164ec8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "de41ee24f77b0fc45397db3e277cae2adbd43dfe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "55e5256adf3940e71802e2f749cacf81518726b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "e2829ae5459ddb5fce526b2e84697edf6c0c3cef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
        "lessThan": "26b2bd70d22457556e2fa01cbf1192cb1a94d619",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_conntrack.h",
      "net/openvswitch/conntrack.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_conntrack.h",
      "net/openvswitch/conntrack.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98491

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#55603 · Revision 1
Added to Heist Feed
Publisher date
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