{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72344", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.920Z", "datePublished": "2026-08-15T05:55:49.751Z", "dateUpdated": "2026-08-17T05:43:03.143Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:03.143Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: TC, skip peer flow cleanup when LAG seq is unavailable\n\nmlx5_lag_get_dev_seq() will return error when the peer isn't in the LAG\nor when no device is marked as master. Result bad memory access and kernel\ncrash[1].\n\nHence, skip the peer when lookup fails.\n\nNote: In case there are peer flows, they are cleaned before LAG cleared\nthe master mark.\n\n[1]\nRIP: 0010:mlx5e_tc_del_fdb_peers_flow+0x3d/0x350 [mlx5_core]\nCall Trace:\n \n mlx5e_tc_clean_fdb_peer_flows+0xc1/0x130 [mlx5_core]\n mlx5_esw_offloads_unpair+0x3a/0x400 [mlx5_core]\n mlx5_esw_offloads_devcom_event+0xee/0x360 [mlx5_core]\n mlx5_devcom_send_event+0x7a/0x140 [mlx5_core]\n mlx5_esw_offloads_devcom_cleanup+0x2f/0x90 [mlx5_core]\n mlx5e_tc_esw_cleanup+0x28/0xf0 [mlx5_core]\n mlx5e_rep_tc_cleanup+0x19/0x30 [mlx5_core]\n mlx5e_cleanup_uplink_rep_tx+0x36/0x40 [mlx5_core]\n mlx5e_cleanup_rep_tx+0x55/0x60 [mlx5_core]\n mlx5e_detach_netdev+0x96/0xf0 [mlx5_core]\n mlx5e_netdev_change_profile+0x5b/0x120 [mlx5_core]\n mlx5e_netdev_attach_nic_profile+0x1b/0x30 [mlx5_core]\n mlx5e_vport_rep_unload+0xdd/0x110 [mlx5_core]\n __esw_offloads_unload_rep+0x81/0xb0 [mlx5_core]\n mlx5_eswitch_unregister_vport_reps+0x1d7/0x220 [mlx5_core]\n mlx5e_rep_remove+0x22/0x30 [mlx5_core]\n device_release_driver_internal+0x194/0x1f0\n bus_remove_device+0xe8/0x1b0\n device_del+0x159/0x3c0\n mlx5_rescan_drivers_locked+0xbc/0x2d0 [mlx5_core]\n mlx5_unregister_device+0x54/0x80 [mlx5_core]\n mlx5_uninit_one+0x73/0x130 [mlx5_core]\n remove_one+0x78/0xe0 [mlx5_core]\n pci_device_remove+0x39/0xa0" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in mlx5e TC eswitch peer-flow teardown (mlx5e_tc_clean_fdb_peer_flows/mlx5e_tc_del_fdb_peers_flow), reached via local TC netlink, netdev/LAG reconfiguration, or driver unload—not from processing remote network packets.\nAC:L - On mlx5 LAG/merged-eswitch systems, a caller with CAP_NET_ADMIN can install TC flower rules that create peer flows, then trigger LAG unpair/teardown so mlx5_lag_get_dev_seq() fails and the unchecked negative index is used reliably.\nPR:L - Exploitation requires CAP_NET_ADMIN to install/delete mlx5e TC cls_flower offload rules and manipulate LAG/bond state; CAP_NET_ADMIN is obtainable in user/network namespaces and is not init-namespace root.\nUI:N - No victim interaction is required; the crash occurs during kernel-initiated peer-flow cleanup when LAG sequence lookup fails during eswitch unpair or mlx5e netdev/driver teardown.\nS:U - Impact is kernel memory corruption and crash on the host running mlx5; it does not cross a VM/hypervisor, IOMMU, or other security boundary into a separate authority.\nC:H - mlx5_lag_get_dev_seq() errors (e.g., -ENOENT) are used unchecked as peer_flows[]/flow->peer[] indices, causing out-of-bounds list operations that read and corrupt adjacent kernel memory beyond the flow structures.\nI:H - The faulting list_del(&flow->peer[peer_index]) and peer_flows[i] walks with a negative index perform out-of-bounds linked-list writes, corrupting kernel heap/metadata and enabling further memory control primitives.\nA:H - The fix commit documents a reproducible kernel crash (oops at mlx5e_tc_del_fdb_peers_flow) from this bad memory access during mlx5 eswitch/TC cleanup, causing complete loss of system availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c" ], "versions": [ { "version": "971b28accc09436fe6a6d5afd667dcbfb3ed7e03", "lessThan": "5a95aa0198af75047d98fb72950642c89dab770f", "status": "affected", "versionType": "git" }, { "version": "971b28accc09436fe6a6d5afd667dcbfb3ed7e03", "lessThan": "7bed4af0ced82948d660205efecd551ef8bc3912", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c" ], "versions": [ { "version": "7.1", "status": "affected" }, { "version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5a95aa0198af75047d98fb72950642c89dab770f" }, { "url": "https://git.kernel.org/stable/c/7bed4af0ced82948d660205efecd551ef8bc3912" } ], "title": "net/mlx5e: TC, skip peer flow cleanup when LAG seq is unavailable", "x_generator": { "engine": "bippy-1.2.0" } } } }