CVE-2026-99043 (GCVE-0-2026-99043)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:22 – Updated: 2026-10-23 12:22
VLAI
Title
ice: fix metadata_dst refcount handling on representor teardown
Summary
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
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f5396b8a663f7a78ee5b75a47ee524b40795b265 , < 1f263235651775f93c15d90c9f25c3f4a4ef6512 (git)
Affected: f5396b8a663f7a78ee5b75a47ee524b40795b265 , < 6f5544f53f1e58ea8a49fb9f9158d5793b9205b0 (git)
Affected: f5396b8a663f7a78ee5b75a47ee524b40795b265 , < beb05f484a1e4a5a66e3678e4b7f3147f651c080 (git)
Affected: f5396b8a663f7a78ee5b75a47ee524b40795b265 , < 5e4d20db5179e83a4948927bc39e489a9a83256d (git)
Affected: f5396b8a663f7a78ee5b75a47ee524b40795b265 , < 58858b8f14803a7eeac297b3ce20f3b21bf2ff66 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/ice/ice_eswitch.c"
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          "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\u0027s 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."
        }
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          "url": "https://git.kernel.org/stable/c/58858b8f14803a7eeac297b3ce20f3b21bf2ff66"
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    "dateReserved": "2026-09-25T10:25:14.387Z",
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      "initial_release_date": "2026-10-25T01:04:30.000Z",
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            "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\u0027s 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."
          }
        ],
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        "vulnStatus": "Received"
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}



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