{"id":"CVE-2026-43013","state":"PUBLISHED","title":"net/mlx5: lag: Check for LAG device before creating debugfs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: lag: Check for LAG device before creating debugfs\n\n__mlx5_lag_dev_add_mdev() may return 0 (success) even when an error\noccurs that is handled gracefully. Consequently, the initialization\nflow proceeds to call mlx5_ldev_add_debugfs() even when there is no\nvalid LAG context.\n\nmlx5_ldev_add_debugfs() blindly created the debugfs directory and\nattributes. This exposed interfaces (like the members file) that rely on\na valid ldev pointer, leading to potential NULL pointer dereferences if\naccessed when ldev is NULL.\n\nAdd a check to verify that mlx5_lag_dev(dev) returns a valid pointer\nbefore attempting to create the debugfs entries.","publishedAt":"2026-05-01T14:15:18.907Z","updatedAt":"2026-05-11T22:16:00.983Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"a3db46d5f4df92630a96f7bc77b60e75c2353e06","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"7129632cab3e4d23510b21930aa73b8d97a859f5","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"cfa774e6c920c81e700327bf10db8cb50d5db456","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"c53cf44588a93000f71817a6bb87a66353c48dee","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"89c65f2fcd8801365b410f40a427cbcd7f4c28e9","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"bf16bca6653679d8a514d6c1c5a2c67065033f14","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c"]}],"references":["https://git.kernel.org/stable/c/a3db46d5f4df92630a96f7bc77b60e75c2353e06","https://git.kernel.org/stable/c/7129632cab3e4d23510b21930aa73b8d97a859f5","https://git.kernel.org/stable/c/cfa774e6c920c81e700327bf10db8cb50d5db456","https://git.kernel.org/stable/c/c53cf44588a93000f71817a6bb87a66353c48dee","https://git.kernel.org/stable/c/89c65f2fcd8801365b410f40a427cbcd7f4c28e9","https://git.kernel.org/stable/c/bf16bca6653679d8a514d6c1c5a2c67065033f14"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43013.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43013","state":"PUBLISHED","datePublished":"2026-05-01T14:15:18.907Z","dateUpdated":"2026-05-11T22:16:00.983Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.974Z"},"containers":{"cna":{"title":"net/mlx5: lag: Check for LAG device before creating debugfs","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: lag: Check for LAG device before creating debugfs\n\n__mlx5_lag_dev_add_mdev() may return 0 (success) even when an error\noccurs that is handled gracefully. Consequently, the initialization\nflow proceeds to call mlx5_ldev_add_debugfs() even when there is no\nvalid LAG context.\n\nmlx5_ldev_add_debugfs() blindly created the debugfs directory and\nattributes. This exposed interfaces (like the members file) that rely on\na valid ldev pointer, leading to potential NULL pointer dereferences if\naccessed when ldev is NULL.\n\nAdd a check to verify that mlx5_lag_dev(dev) returns a valid pointer\nbefore attempting to create the debugfs entries."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"a3db46d5f4df92630a96f7bc77b60e75c2353e06","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"7129632cab3e4d23510b21930aa73b8d97a859f5","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"cfa774e6c920c81e700327bf10db8cb50d5db456","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"c53cf44588a93000f71817a6bb87a66353c48dee","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"89c65f2fcd8801365b410f40a427cbcd7f4c28e9","versionType":"git"},{"version":"7f46a0b7327ae261f9981888708dbca22c283900","status":"affected","lessThan":"bf16bca6653679d8a514d6c1c5a2c67065033f14","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a3db46d5f4df92630a96f7bc77b60e75c2353e06"},{"url":"https://git.kernel.org/stable/c/7129632cab3e4d23510b21930aa73b8d97a859f5"},{"url":"https://git.kernel.org/stable/c/cfa774e6c920c81e700327bf10db8cb50d5db456"},{"url":"https://git.kernel.org/stable/c/c53cf44588a93000f71817a6bb87a66353c48dee"},{"url":"https://git.kernel.org/stable/c/89c65f2fcd8801365b410f40a427cbcd7f4c28e9"},{"url":"https://git.kernel.org/stable/c/bf16bca6653679d8a514d6c1c5a2c67065033f14"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:16:00.983Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}