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netfilter: nft_tunnel: fix use-after-free on object destroy

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory. Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.

Announced Source revision 1
Original source ↗

CVE-2026-53212

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-2026-53212

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": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "349df61526d2e39decc685d246202e3e284cfe05",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "55b79b1ae42372012413ce0413181d26679b17ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "5e9ee18b27fde88cb6148202b33916c66693fe82",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "8767fe4079affa74314d7eb3220e700150289842",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "fda6573a46ad24f35348e024905ee5bdf729797e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "f9a0e4b61054cde89a2a77845293c726cc07cc43",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
        "lessThan": "c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_tunnel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_tunnel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53212

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40781 · Revision 1
Added to Heist Feed
Publisher date
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