CVE-2026-72072 (GCVE-0-2026-72072)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-19 21:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: macsec: fix use-after-free of metadata_dst on RX SC delete When an offloaded MACsec RX SC is deleted, macsec_del_rxsc_ctx() freed the per-SC metadata_dst with metadata_dst_free(), which kfree()s the object unconditionally and ignores the dst reference count. The RX datapath in mlx5e_macsec_offload_handle_rx_skb() looks up the SC under rcu_read_lock() via xa_load(), takes a reference with dst_hold() and attaches the dst to the skb with skb_dst_set(). A reader that already obtained the rx_sc pointer can race with the delete path and operate on freed memory. Fix the owner side by dropping the reference with dst_release() instead of freeing unconditionally, and convert the RX datapath to dst_hold_safe() so a reader racing the SC delete cannot attach a dst whose last reference was just dropped; only attach it when a reference was actually taken. mlx5e_macsec_add_rxsc() also published sc_xarray_element via xa_alloc() before rx_sc->md_dst was allocated and initialised, so a datapath reader that looked the SC up by fs_id could observe rx_sc with md_dst still NULL or, on weakly-ordered architectures, a non-NULL md_dst pointer whose contents were not yet visible. NULL-check the xa_load() result and md_dst on the datapath, and reorder add_rxsc() so the xa_alloc() publish happens only after md_dst is fully initialised; the xarray RCU publish then pairs with the rcu_read_lock()/xa_load() in the datapath. Note: macsec_del_rxsc_ctx() also kfree()s rx_sc->sc_xarray_element without an RCU grace period while the same datapath reads it under rcu_read_lock(); that is a separate pre-existing issue left to a follow-up patch. Found by 0sec automated security-research tooling (https://0sec.ai).
References
Impacted products
Vendor Product Version
Linux Linux Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
Version: b7c9400cbc48c3713190b3bce4e0c87e924e4104
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The RX\\ndatapath in mlx5e_macsec_offload_handle_rx_skb() looks up the SC under\\nrcu_read_lock() via xa_load(), takes a reference with dst_hold() and\\nattaches the dst to the skb with skb_dst_set(). A reader that already\\nobtained the rx_sc pointer can race with the delete path and operate on\\nfreed memory.\\n\\nFix the owner side by dropping the reference with dst_release() instead\\nof freeing unconditionally, and convert the RX datapath to\\ndst_hold_safe() so a reader racing the SC delete cannot attach a dst\\nwhose last reference was just dropped; only attach it when a reference\\nwas actually taken.\\n\\nmlx5e_macsec_add_rxsc() also published sc_xarray_element via xa_alloc()\\nbefore rx_sc-\u003emd_dst was allocated and initialised, so a datapath reader\\nthat looked the SC up by fs_id could observe rx_sc with md_dst still\\nNULL or, on weakly-ordered architectures, a non-NULL md_dst pointer\\nwhose contents were not yet visible. NULL-check the xa_load() result and\\nmd_dst on the datapath, and reorder add_rxsc() so the xa_alloc() publish\\nhappens only after md_dst is fully initialised; the xarray RCU publish\\nthen pairs with the rcu_read_lock()/xa_load() in the datapath.\\n\\nNote: macsec_del_rxsc_ctx() also kfree()s rx_sc-\u003esc_xarray_element\\nwithout an RCU grace period while the same datapath reads it under\\nrcu_read_lock(); that is a separate pre-existing issue left to a\\nfollow-up patch.\\n\\nFound by 0sec automated security-research tooling (https://0sec.ai).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"6.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:40:03.099Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72072\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:19:26.618Z\", \"dateReserved\": \"2026-08-09T03:40:39.904Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:52:23.946Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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