{ "affected": [ { "ranges": [ { "events": [ { "introduced": "51976c6cd786151b6a1bdf8b8b3334beac0ba99c" }, { "fixed": "426f54f20b79c5b164a0472ad3f6ba36afcd08c6" }, { "fixed": "a44a3f175eaee7e5aeb6a8fed381c4a0d5f49236" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.11.11" }, { "fixed": "6.12" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "6.12.2" }, { "fixed": "6.13" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "0598914a950ddfa694f410e482453cdbb9265515" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" }, { "events": [ { "introduced": "86092a4e46d161d24f8106df082e24b8efe87382" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "6.13.0" }, { "fixed": "7.2.8" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98431.json" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency\n\nCommit 51976c6cd786 (\"RDMA/core: Provide rdma_user_mmap_disassociate()\nto disassociate mmap pages\") introduced disassociation_lock to protect\nnew mmap registrations against uverbs_user_mmap_disassociate(), but\ncreated an ABBA deadlock:\n\n Thread A (mmap / fork):\n mmap_lock -\u003e disassociation_lock\n\n Thread B (disassociate):\n disassociation_lock -\u003e mmap_lock\n\nFix by removing disassociation_lock entirely and using the pre-existing\nhw_destroy_rwsem instead. hw_destroy_rwsem already provides the same\nprotection: rdma_umap_open() and ib_uverbs_mmap() both use\ndown_read_trylock() before registering a new VMA, so holding hw_destroy_rwsem\nin uverbs_user_mmap_disassociate() is sufficient to block new registrations.\ntrylock is used in both mmap paths (not blocking down_read) because\nmmap_lock is already held on entry, and uverbs_user_mmap_disassociate()\nacquires mmap_lock internally — a blocking read would recreate the same\ndeadlock.\n\nThe only caller that was not taking hw_destroy_rwsem for write was\nrdma_user_mmap_disassociate(). Fix it to take the rwsem per-ufile while\niterating under lists_mutex. This is safe because ib_uverbs_close()\nreleases hw_destroy_rwsem entirely before acquiring lists_mutex, so the\ntwo locks are never held simultaneously.\n\nlockdep warning:\n\n [ 776.654252] ======================================================\n [ 776.655214] WARNING: possible circular locking dependency detected\n [ 776.656167] 6.18.0for-upstream_debug_94e244d9ccab #1 Not tainted\n [ 776.657114] ------------------------------------------------------\n [ 776.658087] devlink/14824 is trying to acquire lock:\n [ 776.658879] ffff88811170c800 (\u0026mm-\u003emmap_lock){++++}-{4:4}, at: uverbs_user_mmap_disassociate+0x168/0x780 [ib_uverbs]\n [ 776.660479]\n [ 776.660479] but task is already holding lock:\n [ 776.661460] ffff888142d92b08 (\u0026file-\u003edisassociation_lock){+.+.}-{4:4}, at: uverbs_user_mmap_disassociate+0x39/0x780 [ib_uverbs]\n [ 776.663177]\n [ 776.663177] which lock already depends on the new lock.\n [ 776.663177]\n [ 776.664525]\n [ 776.664525] the existing dependency chain (in reverse order) is:\n [ 776.665724]\n [ 776.665724] -\u003e #2 (\u0026file-\u003edisassociation_lock){+.+.}-{4:4}:\n [ 776.666887] __mutex_lock+0x16d/0x2330\n [ 776.667633] rdma_umap_open+0x129/0x280 [ib_uverbs]\n [ 776.668489] dup_mmap+0xa40/0x1790\n [ 776.669170] copy_process+0x5dd2/0x6170\n [ 776.669933] kernel_clone+0xb6/0x610\n [ 776.670636] __do_sys_clone+0xb5/0xf0\n [ 776.671354] do_syscall_64+0x70/0x12e0\n [ 776.672083] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n [ 776.672940]\n [ 776.672940] -\u003e #1 (\u0026mm-\u003emmap_lock/1){+.+.}-{4:4}:\n [ 776.673985] down_write_nested+0x90/0x1e0\n [ 776.674751] dup_mmap+0x201/0x1790\n [ 776.675448] copy_process+0x5dd2/0x6170\n [ 776.676180] kernel_clone+0xb6/0x610\n [ 776.676904] __do_sys_clone+0xb5/0xf0\n [ 776.677615] do_syscall_64+0x70/0x12e0\n [ 776.678351] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n [ 776.679239]\n [ 776.679239] -\u003e #0 (\u0026mm-\u003emmap_lock){++++}-{4:4}:\n [ 776.680253] __lock_acquire+0x18c6/0x2ec0\n [ 776.681018] lock_acquire+0x10e/0x2e0\n [ 776.681742] down_read+0x95/0x430\n [ 776.682395] uverbs_user_mmap_disassociate+0x168/0x780 [ib_uverbs]\n [ 776.683436] uverbs_destroy_ufile_hw+0x1ae/0x270 [ib_uverbs]\n [ 776.684416] ib_uverbs_remove_one+0x22b/0x420 [ib_uverbs]\n [ 776.685371] remove_client_context+0xa6/0xf0 [ib_core]\n [ 776.686342] disable_device+0x12b/0x240 [ib_core]\n [ 776.687249] __ib_unregister_device+0x269/0x460 [ib_core]\n [ 776.688233] ib_unregister_device+0x21/0x30 [ib_core]\n [ 776.689140] mlx5r_remove+0xd0/0x170 [mlx5_ib]\n [ 776.689999] device_release_driver_internal+0x3b2/0x5\n---truncated---", "id": "CVE-2026-98431", "modified": "2026-10-15T02:30:55.640623530Z", "published": "2026-10-14T13:27:56.162Z", "references": [ { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/426f54f20b79c5b164a0472ad3f6ba36afcd08c6" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/a44a3f175eaee7e5aeb6a8fed381c4a0d5f49236" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98431.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98431" } ], "schema_version": "1.9.0", "summary": "RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency" }