{"id":"CVE-2025-21675","state":"PUBLISHED","title":"net/mlx5: Clear port select structure when fail to create","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Clear port select structure when fail to create\n\nClear the port select structure on error so no stale values left after\ndefiners are destroyed. That's because the mlx5_lag_destroy_definers()\nalways try to destroy all lag definers in the tt_map, so in the flow\nbelow lag definers get double-destroyed and cause kernel crash:\n\n  mlx5_lag_port_sel_create()\n    mlx5_lag_create_definers()\n      mlx5_lag_create_definer()     <- Failed on tt 1\n        mlx5_lag_destroy_definers() <- definers[tt=0] gets destroyed\n  mlx5_lag_port_sel_create()\n    mlx5_lag_create_definers()\n      mlx5_lag_create_definer()     <- Failed on tt 0\n        mlx5_lag_destroy_definers() <- definers[tt=0] gets double-destroyed\n\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008\n Mem abort info:\n   ESR = 0x0000000096000005\n   EC = 0x25: DABT (current EL), IL = 32 bits\n   SET = 0, FnV = 0\n   EA = 0, S1PTW = 0\n   FSC = 0x05: level 1 translation fault\n Data abort info:\n   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000\n   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n user pgtable: 64k pages, 48-bit VAs, pgdp=0000000112ce2e00\n [0000000000000008] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000\n Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP\n Modules linked in: iptable_raw bonding ip_gre ip6_gre gre ip6_tunnel tunnel6 geneve ip6_udp_tunnel udp_tunnel ipip tunnel4 ip_tunnel rdma_ucm(OE) rdma_cm(OE) iw_cm(OE) ib_ipoib(OE) ib_cm(OE) ib_umad(OE) mlx5_ib(OE) ib_uverbs(OE) mlx5_fwctl(OE) fwctl(OE) mlx5_core(OE) mlxdevm(OE) ib_core(OE) mlxfw(OE) memtrack(OE) mlx_compat(OE) openvswitch nsh nf_conncount psample xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter bridge stp llc netconsole overlay efi_pstore sch_fq_codel zram ip_tables crct10dif_ce qemu_fw_cfg fuse ipv6 crc_ccitt [last unloaded: mlx_compat(OE)]\n  CPU: 3 UID: 0 PID: 217 Comm: kworker/u53:2 Tainted: G           OE      6.11.0+ #2\n  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n  Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : mlx5_del_flow_rules+0x24/0x2c0 [mlx5_core]\n  lr : mlx5_lag_destroy_definer+0x54/0x100 [mlx5_core]\n  sp : ffff800085fafb00\n  x29: ffff800085fafb00 x28: ffff0000da0c8000 x27: 0000000000000000\n  x26: ffff0000da0c8000 x25: ffff0000da0c8000 x24: ffff0000da0c8000\n  x23: ffff0000c31f81a0 x22: 0400000000000000 x21: ffff0000da0c8000\n  x20: 0000000000000000 x19: 0000000000000001 x18: 0000000000000000\n  x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffff8b0c9350\n  x14: 0000000000000000 x13: ffff800081390d18 x12: ffff800081dc3cc0\n  x11: 0000000000000001 x10: 0000000000000b10 x9 : ffff80007ab7304c\n  x8 : ffff0000d00711f0 x7 : 0000000000000004 x6 : 0000000000000190\n  x5 : ffff00027edb3010 x4 : 0000000000000000 x3 : 0000000000000000\n  x2 : ffff0000d39b8000 x1 : ffff0000d39b8000 x0 : 0400000000000000\n  Call trace:\n   mlx5_del_flow_rules+0x24/0x2c0 [mlx5_core]\n   mlx5_lag_destroy_definer+0x54/0x100 [mlx5_core]\n   mlx5_lag_destroy_definers+0xa0/0x108 [mlx5_core]\n   mlx5_lag_port_sel_create+0x2d4/0x6f8 [mlx5_core]\n   mlx5_activate_lag+0x60c/0x6f8 [mlx5_core]\n   mlx5_do_bond_work+0x284/0x5c8 [mlx5_core]\n   process_one_work+0x170/0x3e0\n   worker_thread+0x2d8/0x3e0\n   kthread+0x11c/0x128\n   ret_from_fork+0x10/0x20\n  Code: a9025bf5 aa0003f6 a90363f7 f90023f9 (f9400400)\n  ---[ end trace 0000000000000000 ]---","publishedAt":"2025-01-31T11:25:37.457Z","updatedAt":"2026-05-11T21:04:16.290Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"efc92a260e23cf9fafb0b6f6c9beb6f8df93fab4","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"473bc285378f49aa27e5b3e95a6d5ed12995d654","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"1f6e619ef2a4def555b14ac2aeb4304bfccad59b","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"5641e82cb55b4ecbc6366a499300917d2f3e6790","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.127","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.74","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.11","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","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/port_sel.c"]}],"references":["https://git.kernel.org/stable/c/efc92a260e23cf9fafb0b6f6c9beb6f8df93fab4","https://git.kernel.org/stable/c/473bc285378f49aa27e5b3e95a6d5ed12995d654","https://git.kernel.org/stable/c/1f6e619ef2a4def555b14ac2aeb4304bfccad59b","https://git.kernel.org/stable/c/5641e82cb55b4ecbc6366a499300917d2f3e6790","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21675.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21675","state":"PUBLISHED","datePublished":"2025-01-31T11:25:37.457Z","dateUpdated":"2026-05-11T21:04:16.290Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.737Z"},"containers":{"cna":{"title":"net/mlx5: Clear port select structure when fail to create","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Clear port select structure when fail to create\n\nClear the port select structure on error so no stale values left after\ndefiners are destroyed. That's because the mlx5_lag_destroy_definers()\nalways try to destroy all lag definers in the tt_map, so in the flow\nbelow lag definers get double-destroyed and cause kernel crash:\n\n  mlx5_lag_port_sel_create()\n    mlx5_lag_create_definers()\n      mlx5_lag_create_definer()     <- Failed on tt 1\n        mlx5_lag_destroy_definers() <- definers[tt=0] gets destroyed\n  mlx5_lag_port_sel_create()\n    mlx5_lag_create_definers()\n      mlx5_lag_create_definer()     <- Failed on tt 0\n        mlx5_lag_destroy_definers() <- definers[tt=0] gets double-destroyed\n\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008\n Mem abort info:\n   ESR = 0x0000000096000005\n   EC = 0x25: DABT (current EL), IL = 32 bits\n   SET = 0, FnV = 0\n   EA = 0, S1PTW = 0\n   FSC = 0x05: level 1 translation fault\n Data abort info:\n   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000\n   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n user pgtable: 64k pages, 48-bit VAs, pgdp=0000000112ce2e00\n [0000000000000008] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000\n Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP\n Modules linked in: iptable_raw bonding ip_gre ip6_gre gre ip6_tunnel tunnel6 geneve ip6_udp_tunnel udp_tunnel ipip tunnel4 ip_tunnel rdma_ucm(OE) rdma_cm(OE) iw_cm(OE) ib_ipoib(OE) ib_cm(OE) ib_umad(OE) mlx5_ib(OE) ib_uverbs(OE) mlx5_fwctl(OE) fwctl(OE) mlx5_core(OE) mlxdevm(OE) ib_core(OE) mlxfw(OE) memtrack(OE) mlx_compat(OE) openvswitch nsh nf_conncount psample xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter bridge stp llc netconsole overlay efi_pstore sch_fq_codel zram ip_tables crct10dif_ce qemu_fw_cfg fuse ipv6 crc_ccitt [last unloaded: mlx_compat(OE)]\n  CPU: 3 UID: 0 PID: 217 Comm: kworker/u53:2 Tainted: G           OE      6.11.0+ #2\n  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n  Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : mlx5_del_flow_rules+0x24/0x2c0 [mlx5_core]\n  lr : mlx5_lag_destroy_definer+0x54/0x100 [mlx5_core]\n  sp : ffff800085fafb00\n  x29: ffff800085fafb00 x28: ffff0000da0c8000 x27: 0000000000000000\n  x26: ffff0000da0c8000 x25: ffff0000da0c8000 x24: ffff0000da0c8000\n  x23: ffff0000c31f81a0 x22: 0400000000000000 x21: ffff0000da0c8000\n  x20: 0000000000000000 x19: 0000000000000001 x18: 0000000000000000\n  x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffff8b0c9350\n  x14: 0000000000000000 x13: ffff800081390d18 x12: ffff800081dc3cc0\n  x11: 0000000000000001 x10: 0000000000000b10 x9 : ffff80007ab7304c\n  x8 : ffff0000d00711f0 x7 : 0000000000000004 x6 : 0000000000000190\n  x5 : ffff00027edb3010 x4 : 0000000000000000 x3 : 0000000000000000\n  x2 : ffff0000d39b8000 x1 : ffff0000d39b8000 x0 : 0400000000000000\n  Call trace:\n   mlx5_del_flow_rules+0x24/0x2c0 [mlx5_core]\n   mlx5_lag_destroy_definer+0x54/0x100 [mlx5_core]\n   mlx5_lag_destroy_definers+0xa0/0x108 [mlx5_core]\n   mlx5_lag_port_sel_create+0x2d4/0x6f8 [mlx5_core]\n   mlx5_activate_lag+0x60c/0x6f8 [mlx5_core]\n   mlx5_do_bond_work+0x284/0x5c8 [mlx5_core]\n   process_one_work+0x170/0x3e0\n   worker_thread+0x2d8/0x3e0\n   kthread+0x11c/0x128\n   ret_from_fork+0x10/0x20\n  Code: a9025bf5 aa0003f6 a90363f7 f90023f9 (f9400400)\n  ---[ end trace 0000000000000000 ]---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"efc92a260e23cf9fafb0b6f6c9beb6f8df93fab4","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"473bc285378f49aa27e5b3e95a6d5ed12995d654","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"1f6e619ef2a4def555b14ac2aeb4304bfccad59b","versionType":"git"},{"version":"dc48516ec7d369c6b80bf9f14d774287b6c428aa","status":"affected","lessThan":"5641e82cb55b4ecbc6366a499300917d2f3e6790","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.127","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.74","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.11","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","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/port_sel.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/efc92a260e23cf9fafb0b6f6c9beb6f8df93fab4"},{"url":"https://git.kernel.org/stable/c/473bc285378f49aa27e5b3e95a6d5ed12995d654"},{"url":"https://git.kernel.org/stable/c/1f6e619ef2a4def555b14ac2aeb4304bfccad59b"},{"url":"https://git.kernel.org/stable/c/5641e82cb55b4ecbc6366a499300917d2f3e6790"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:04:16.290Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.127"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.74"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.12.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21675","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:52:01.288500Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:57:11.729Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:58:53.065Z"}}]}}}