CVE-2026-99043

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: ice: fix metadata_dst refcount handling on representor teardown ice_eswitch_release_repr() uses metadata_dst_free() to release the representor's metadata_dst. metadata_dst_free() directly frees the underlying memory without checking the dst_entry refcount. When ice_eswitch_port_start_xmit() processes a packet, it takes a reference via dst_hold() and attaches the metadata_dst to the skb. If the representor is torn down while packets are still queued on the lower device (e.g. in a qdisc), the metadata_dst is freed while references are still held. Use dst_release() instead, which correctly decrements the refcount and only frees the object when all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set. Other drivers sharing this pattern (nfp, airoha, bnxt) already use dst_release() for their metadata_dst lifecycle.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 13:17:27.723000

Last modified

2026-10-30 13:21:41.453000

View original CVE JSON

{
  "id": "CVE-2026-99043",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T13:17:27.723",
  "lastModified": "2026-10-30T13:21:41.453",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: fix metadata_dst refcount handling on representor teardown\n\nice_eswitch_release_repr() uses metadata_dst_free() to release the\nrepresentor's metadata_dst.  metadata_dst_free() directly frees the\nunderlying memory without checking the dst_entry refcount.\n\nWhen ice_eswitch_port_start_xmit() processes a packet, it takes a\nreference via dst_hold() and attaches the metadata_dst to the skb.\nIf the representor is torn down while packets are still queued on\nthe lower device (e.g. in a qdisc), the metadata_dst is freed while\nreferences are still held.\n\nUse dst_release() instead, which correctly decrements the refcount\nand only frees the object when all references are dropped.  The dst\nsubsystem already handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.\n\nOther drivers sharing this pattern (nfp, airoha, bnxt) already use\ndst_release() for their metadata_dst lifecycle."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/net/ethernet/intel/ice/ice_eswitch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "f5396b8a663f7a78ee5b75a47ee524b40795b265",
              "lessThan": "41f0d9ab158fb51f34bded5f8a40918e4f70b2b6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5396b8a663f7a78ee5b75a47ee524b40795b265",
              "lessThan": "1f263235651775f93c15d90c9f25c3f4a4ef6512",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5396b8a663f7a78ee5b75a47ee524b40795b265",
              "lessThan": "6f5544f53f1e58ea8a49fb9f9158d5793b9205b0",
              "versionType": "git",
              "status": "affected"
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            {
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              "versionType": "git",
              "status": "affected"
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              "lessThan": "5e4d20db5179e83a4948927bc39e489a9a83256d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f5396b8a663f7a78ee5b75a47ee524b40795b265",
              "lessThan": "58858b8f14803a7eeac297b3ce20f3b21bf2ff66",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/net/ethernet/intel/ice/ice_eswitch.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.16",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.16",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.113",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.11",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1f263235651775f93c15d90c9f25c3f4a4ef6512",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/58858b8f14803a7eeac297b3ce20f3b21bf2ff66",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5e4d20db5179e83a4948927bc39e489a9a83256d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6f5544f53f1e58ea8a49fb9f9158d5793b9205b0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/beb05f484a1e4a5a66e3678e4b7f3147f651c080",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}