{"id":"CVE-2026-72072","revision":"eaa86ec20f2a4e9f99aae9e447e9037b","records":[{"revision":"eaa86ec20f2a4e9f99aae9e447e9037b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72072","aliases":[],"title":"net/mlx5e: macsec: fix use-after-free of metadata_dst on RX SC delete","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: macsec: fix use-after-free of metadata_dst on RX SC delete\n\nWhen an offloaded MACsec RX SC is deleted, macsec_del_rxsc_ctx() freed\nthe per-SC metadata_dst with metadata_dst_free(), which kfree()s the\nobject unconditionally and ignores the dst reference count. 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->md_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->sc_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).","state":0,"publishedAt":"2026-08-15T05:52:23.946+00:00","modifiedAt":"2026-10-19T21:19:26.618+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"b1a4d0c568bbb52c7c04f4fce3c097dae89ed6cb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"218cc15a4c907659ad4b0e68c535c61594311205\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"4a5073b7b30243658f58b2d2d35a823da7fd34d9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"ed3cc4218070d6b98bf5fb456dccae424fd38c4f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"088873af13590ebde10de2ade847f57a05ec61c6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b7c9400cbc48c3713190b3bce4e0c87e924e4104\",\n \"lessThan\": \"de74d8fd10291763d97b218f09adcc7513c975e4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b1a4d0c568bbb52c7c04f4fce3c097dae89ed6cb","https://git.kernel.org/stable/c/218cc15a4c907659ad4b0e68c535c61594311205","https://git.kernel.org/stable/c/4a5073b7b30243658f58b2d2d35a823da7fd34d9","https://git.kernel.org/stable/c/ed3cc4218070d6b98bf5fb456dccae424fd38c4f","https://git.kernel.org/stable/c/088873af13590ebde10de2ade847f57a05ec61c6","https://git.kernel.org/stable/c/de74d8fd10291763d97b218f09adcc7513c975e4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72072","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72072","identifiers":["CVE-2026-72072"]},"retained":false,"historicalAffected":[]}],"coverage":[]}