{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-37786", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.940Z", "datePublished": "2025-05-01T13:07:20.980Z", "dateUpdated": "2026-05-11T21:15:09.021Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:15:09.021Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: free routing table on probe failure\n\nIf complete = true in dsa_tree_setup(), it means that we are the last\nswitch of the tree which is successfully probing, and we should be\nsetting up all switches from our probe path.\n\nAfter \"complete\" becomes true, dsa_tree_setup_cpu_ports() or any\nsubsequent function may fail. If that happens, the entire tree setup is\nin limbo: the first N-1 switches have successfully finished probing\n(doing nothing but having allocated persistent memory in the tree's\ndst->ports, and maybe dst->rtable), and switch N failed to probe, ending\nthe tree setup process before anything is tangible from the user's PoV.\n\nIf switch N fails to probe, its memory (ports) will be freed and removed\nfrom dst->ports. However, the dst->rtable elements pointing to its ports,\nas created by dsa_link_touch(), will remain there, and will lead to\nuse-after-free if dereferenced.\n\nIf dsa_tree_setup_switches() returns -EPROBE_DEFER, which is entirely\npossible because that is where ds->ops->setup() is, we get a kasan\nreport like this:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in mv88e6xxx_setup_upstream_port+0x240/0x568\nRead of size 8 at addr ffff000004f56020 by task kworker/u8:3/42\n\nCall trace:\n __asan_report_load8_noabort+0x20/0x30\n mv88e6xxx_setup_upstream_port+0x240/0x568\n mv88e6xxx_setup+0xebc/0x1eb0\n dsa_register_switch+0x1af4/0x2ae0\n mv88e6xxx_register_switch+0x1b8/0x2a8\n mv88e6xxx_probe+0xc4c/0xf60\n mdio_probe+0x78/0xb8\n really_probe+0x2b8/0x5a8\n __driver_probe_device+0x164/0x298\n driver_probe_device+0x78/0x258\n __device_attach_driver+0x274/0x350\n\nAllocated by task 42:\n __kasan_kmalloc+0x84/0xa0\n __kmalloc_cache_noprof+0x298/0x490\n dsa_switch_touch_ports+0x174/0x3d8\n dsa_register_switch+0x800/0x2ae0\n mv88e6xxx_register_switch+0x1b8/0x2a8\n mv88e6xxx_probe+0xc4c/0xf60\n mdio_probe+0x78/0xb8\n really_probe+0x2b8/0x5a8\n __driver_probe_device+0x164/0x298\n driver_probe_device+0x78/0x258\n __device_attach_driver+0x274/0x350\n\nFreed by task 42:\n __kasan_slab_free+0x48/0x68\n kfree+0x138/0x418\n dsa_register_switch+0x2694/0x2ae0\n mv88e6xxx_register_switch+0x1b8/0x2a8\n mv88e6xxx_probe+0xc4c/0xf60\n mdio_probe+0x78/0xb8\n really_probe+0x2b8/0x5a8\n __driver_probe_device+0x164/0x298\n driver_probe_device+0x78/0x258\n __device_attach_driver+0x274/0x350\n\nThe simplest way to fix the bug is to delete the routing table in its\nentirety. dsa_tree_setup_routing_table() has no problem in regenerating\nit even if we deleted links between ports other than those of switch N,\nbecause dsa_link_touch() first checks whether the port pair already\nexists in dst->rtable, allocating if not.\n\nThe deletion of the routing table in its entirety already exists in\ndsa_tree_teardown(), so refactor that into a function that can also be\ncalled from the tree setup error path.\n\nIn my analysis of the commit to blame, it is the one which added\ndsa_link elements to dst->rtable. Prior to that, each switch had its own\nds->rtable which is freed when the switch fails to probe. But the tree\nis potentially persistent memory." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/dsa/dsa.c" ], "versions": [ { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "51df5513cca6349d0bea01bab95cd96cf869976e", "status": "affected", "versionType": "git" }, { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "6c20894d21600ca1e8549086dfbb986e277bf8a6", "status": "affected", "versionType": "git" }, { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "fb12b460ec46c9efad98de6d9ba349691db51dc7", "status": "affected", "versionType": "git" }, { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "5c8066fbdb9653c6e9a224bdcd8f9c91a484f0de", "status": "affected", "versionType": "git" }, { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "a038f5f15af455dfe35bc68549e02b950978700a", "status": "affected", "versionType": "git" }, { "version": "c5f51765a1f60b701840544faf3ca63204b8dc3c", "lessThan": "8bf108d7161ffc6880ad13a0cc109de3cf631727", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/dsa/dsa.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.201", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.164", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.25", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.4", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "5.5", "versionEndExcluding": "5.15.201" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.164" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.25" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.14.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/51df5513cca6349d0bea01bab95cd96cf869976e" }, { "url": "https://git.kernel.org/stable/c/6c20894d21600ca1e8549086dfbb986e277bf8a6" }, { "url": "https://git.kernel.org/stable/c/fb12b460ec46c9efad98de6d9ba349691db51dc7" }, { "url": "https://git.kernel.org/stable/c/5c8066fbdb9653c6e9a224bdcd8f9c91a484f0de" }, { "url": "https://git.kernel.org/stable/c/a038f5f15af455dfe35bc68549e02b950978700a" }, { "url": "https://git.kernel.org/stable/c/8bf108d7161ffc6880ad13a0cc109de3cf631727" } ], "title": "net: dsa: free routing table on probe failure", "x_generator": { "engine": "bippy-1.2.0" } } } }