{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72345","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.920Z","datePublished":"2026-08-15T05:55:50.427Z","dateUpdated":"2026-08-17T05:43:04.347Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:43:04.347Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: LAG, Fix off-by-one in single-FDB error rollback\n\nOn failure at index i, the reverse cleanup loop in\nmlx5_lag_create_single_fdb() starts from i, so the failed index\nitself is rolled back. That can operate on uninitialized state or\ndouble-tear-down a rule the add_one path already self-rolled-back.\n\nStart the rollback from i - 1 so only successfully-installed entries\nare undone."}],"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 only reachable when mlx5 shared-FDB LAG setup runs via local admin paths (bond netdev notifier or devlink esw_multiport), not from remote packet handling on the mlx5 data path.\nAC:L - An attacker with CAP_NET_ADMIN can trigger bonding/MPESW setup and retry until mlx5_eswitch_offloads_single_fdb_add_one fails, reliably exercising the faulty rollback loop without uncontrollable timing or layout dependencies.\nPR:L - Exploitation requires configuring bonding or devlink eswitch parameters, which needs CAP_NET_ADMIN; per kernel CNA guidance this is Low because that capability is obtainable inside unprivileged user namespaces.\nUI:N - No end-user interaction is required beyond the attacker (or their privileged account) performing the LAG/shared-FDB configuration that reaches mlx5_lag_create_single_fdb().\nS:U - Impact is confined to kernel mlx5 eswitch/LAG state on the host; it does not cross a VM, container, or IOMMU security boundary into another authority.\nC:H - The off-by-one rollback can tear down uninitialized or already-cleared eswitch flow/FDB state, causing memory corruption that can be leveraged for kernel information disclosure beyond a simple crash.\nI:H - Double teardown of master egress bounce rules and slave root FDB entries can corrupt mlx5 steering structures and heap metadata, enabling arbitrary kernel writes or control-flow hijacking.\nA:H - Incorrect rollback of failed single-FDB installs can panic the kernel or leave eswitch offload state inconsistent, causing oops, hang, or denial of service on affected Mellanox hosts."}]}],"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/lag/shared_fdb.c"],"versions":[{"version":"ddbb5ddc43ad000a984149db5af1133433938404","lessThan":"40cc06bf71476932e5d139fa326dcd0372766e16","status":"affected","versionType":"git"},{"version":"ddbb5ddc43ad000a984149db5af1133433938404","lessThan":"0f0e4ae6975c773f7854fc48932a267f6c79088f","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/lag/shared_fdb.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","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":"6.14","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/40cc06bf71476932e5d139fa326dcd0372766e16"},{"url":"https://git.kernel.org/stable/c/0f0e4ae6975c773f7854fc48932a267f6c79088f"}],"title":"net/mlx5: LAG, Fix off-by-one in single-FDB error rollback","x_generator":{"engine":"bippy-1.2.0"}}}}