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netfilter: flowtable: publish HW_DEAD after worker is done

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: publish HW_DEAD after worker is done flow_offload_work_del() sets NF_FLOW_HW_DEAD before the work handler clears NF_FLOW_HW_PENDING. Once a flow is both HW_DYING and HW_DEAD, a concurrent garbage collection pass can remove it and schedule it for RCU freeing. The offload worker holds neither an RCU read lock nor a reference to the flow. If it is preempted after publishing HW_DEAD, the RCU callback can free the flow before the worker resumes and clears HW_PENDING, resulting in a use-after-free. Move HW_DEAD publication to the common worker epilogue after the pending bit is cleared, making it the final flow access by destroy work. Order all preceding flow accesses before publishing the bit that allows garbage collection to free the object.

Announced Source revision 1
Original source ↗

CVE-2026-98625

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-2026-98625

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": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "f92e8f39726ba68a7c42c6b7566be687c8161579",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "00e452a7ca9fda135ea3d04a11128d5088e354a8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "56f39c7d139bb76072efe2fb3dcafc13ba915ad8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "e20701843032c438f879066a77ea85e361c6b999",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "b4f0f05dfbe836a171bff261f17d098a4d5461ea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "b0ef9450e93f2adeb77593db14c2ac7c6c8f5060",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "f26652e99f519e6bd34f8a9b48fbb33c603585f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c8897953f3b2ff5498f3f275708a742bfcdbc24",
        "lessThan": "d644b23afe1ef509c9961a6d84a093c2587edf02",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_flow_table_offload.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": "5.10.271",
        "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": [
      "net/netfilter/nf_flow_table_offload.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98625

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38645 · Revision 1
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Publisher date
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