{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48919", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T06:06:23.295Z", "datePublished": "2024-08-22T01:32:43.390Z", "dateUpdated": "2026-08-05T08:52:54.791Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:54.791Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix double free race when mount fails in cifs_get_root()\n\nWhen cifs_get_root() fails during cifs_smb3_do_mount() we call\ndeactivate_locked_super() which eventually will call delayed_free() which\nwill free the context.\nIn this situation we should not proceed to enter the out: section in\ncifs_smb3_do_mount() and free the same resources a second time.\n\n[Thu Feb 10 12:59:06 2022] BUG: KASAN: use-after-free in rcu_cblist_dequeue+0x32/0x60\n[Thu Feb 10 12:59:06 2022] Read of size 8 at addr ffff888364f4d110 by task swapper/1/0\n\n[Thu Feb 10 12:59:06 2022] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G OE 5.17.0-rc3+ #4\n[Thu Feb 10 12:59:06 2022] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 12/17/2019\n[Thu Feb 10 12:59:06 2022] Call Trace:\n[Thu Feb 10 12:59:06 2022] \n[Thu Feb 10 12:59:06 2022] dump_stack_lvl+0x5d/0x78\n[Thu Feb 10 12:59:06 2022] print_address_description.constprop.0+0x24/0x150\n[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60\n[Thu Feb 10 12:59:06 2022] kasan_report.cold+0x7d/0x117\n[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60\n[Thu Feb 10 12:59:06 2022] __asan_load8+0x86/0xa0\n[Thu Feb 10 12:59:06 2022] rcu_cblist_dequeue+0x32/0x60\n[Thu Feb 10 12:59:06 2022] rcu_core+0x547/0xca0\n[Thu Feb 10 12:59:06 2022] ? call_rcu+0x3c0/0x3c0\n[Thu Feb 10 12:59:06 2022] ? __this_cpu_preempt_check+0x13/0x20\n[Thu Feb 10 12:59:06 2022] ? lock_is_held_type+0xea/0x140\n[Thu Feb 10 12:59:06 2022] rcu_core_si+0xe/0x10\n[Thu Feb 10 12:59:06 2022] __do_softirq+0x1d4/0x67b\n[Thu Feb 10 12:59:06 2022] __irq_exit_rcu+0x100/0x150\n[Thu Feb 10 12:59:06 2022] irq_exit_rcu+0xe/0x30\n[Thu Feb 10 12:59:06 2022] sysvec_hyperv_stimer0+0x9d/0xc0\n...\n[Thu Feb 10 12:59:07 2022] Freed by task 58179:\n[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50\n[Thu Feb 10 12:59:07 2022] kasan_set_track+0x25/0x30\n[Thu Feb 10 12:59:07 2022] kasan_set_free_info+0x24/0x40\n[Thu Feb 10 12:59:07 2022] ____kasan_slab_free+0x137/0x170\n[Thu Feb 10 12:59:07 2022] __kasan_slab_free+0x12/0x20\n[Thu Feb 10 12:59:07 2022] slab_free_freelist_hook+0xb3/0x1d0\n[Thu Feb 10 12:59:07 2022] kfree+0xcd/0x520\n[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0x149/0xbe0 [cifs]\n[Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs]\n[Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140\n[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0\n[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210\n[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0\n[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n[Thu Feb 10 12:59:07 2022] Last potentially related work creation:\n[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50\n[Thu Feb 10 12:59:07 2022] __kasan_record_aux_stack+0xb6/0xc0\n[Thu Feb 10 12:59:07 2022] kasan_record_aux_stack_noalloc+0xb/0x10\n[Thu Feb 10 12:59:07 2022] call_rcu+0x76/0x3c0\n[Thu Feb 10 12:59:07 2022] cifs_umount+0xce/0xe0 [cifs]\n[Thu Feb 10 12:59:07 2022] cifs_kill_sb+0xc8/0xe0 [cifs]\n[Thu Feb 10 12:59:07 2022] deactivate_locked_super+0x5d/0xd0\n[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0xab9/0xbe0 [cifs]\n[Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs]\n[Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140\n[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0\n[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210\n[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0\n[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable path is in the CIFS client during mount of a remote SMB share; a malicious SMB server can induce cifs_read_super()/cifs_get_root() failure after session/tree setup, triggering the buggy cleanup over the network.\nAC:L - A single failed mount through out_super deterministically double-frees prepath immediately and frees cifs_sb/ctx while an RCU delayed_free remains pending; the attacker fully controls the failing server responses and needs no uncontrolled race.\nPR:N - The attacker is the remote SMB server endpoint and needs no privileges on the victim client; client-side mount capability is part of the victim action, not attacker privilege.\nUI:R - A victim must mount or otherwise initiate a CIFS/SMB3 connection to the attacker-controlled share; the server cannot reach cifs_smb3_do_mount without that client action.\nS:U - The double-free/UAF impacts the local kernel CIFS client within the same security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free/double-free of cifs_sb and its smb3_fs_context, enabling heap reuse and arbitrary read primitives per UAF exploitation.\nI:H - The same double-free/UAF of heap objects (cifs_sb/ctx/prepath) enables heap spraying and arbitrary write or control-flow hijacking primitives.\nA:H - The bug produces a kernel use-after-free (KASAN report in rcu_cblist_dequeue) that can oops/panic the system even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/cifsfs.c" ], "versions": [ { "version": "d17abdf7566566fc402c31899b353044a7ff3cf4", "lessThan": "546d60859ecf13380fcabcbeace53a5971493a2b", "status": "affected", "versionType": "git" }, { "version": "d17abdf7566566fc402c31899b353044a7ff3cf4", "lessThan": "563431c1f3c8f2230e4a9c445fa23758742bc4f0", "status": "affected", "versionType": "git" }, { "version": "d17abdf7566566fc402c31899b353044a7ff3cf4", "lessThan": "3d6cc9898efdfb062efb74dc18cfc700e082f5d5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/cifsfs.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.27", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.13", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17", "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": "5.11", "versionEndExcluding": "5.15.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.16.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/546d60859ecf13380fcabcbeace53a5971493a2b" }, { "url": "https://git.kernel.org/stable/c/563431c1f3c8f2230e4a9c445fa23758742bc4f0" }, { "url": "https://git.kernel.org/stable/c/3d6cc9898efdfb062efb74dc18cfc700e082f5d5" } ], "title": "cifs: fix double free race when mount fails in cifs_get_root()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48919", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:33:34.933209Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:11.259Z" } } ] } }