{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-53177", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:25.007Z", "datePublished": "2024-12-27T13:49:21.362Z", "dateUpdated": "2026-08-05T11:44:24.120Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:44:24.120Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: prevent use-after-free due to open_cached_dir error paths\n\nIf open_cached_dir() encounters an error parsing the lease from the\nserver, the error handling may race with receiving a lease break,\nresulting in open_cached_dir() freeing the cfid while the queued work is\npending.\n\nUpdate open_cached_dir() to drop refs rather than directly freeing the\ncfid.\n\nHave cached_dir_lease_break(), cfids_laundromat_worker(), and\ninvalidate_all_cached_dirs() clear has_lease immediately while still\nholding cfids->cfid_list_lock, and then use this to also simplify the\nreference counting in cfids_laundromat_worker() and\ninvalidate_all_cached_dirs().\n\nFixes this KASAN splat (which manually injects an error and lease break\nin open_cached_dir()):\n\n==================================================================\nBUG: KASAN: slab-use-after-free in smb2_cached_lease_break+0x27/0xb0\nRead of size 8 at addr ffff88811cc24c10 by task kworker/3:1/65\n\nCPU: 3 UID: 0 PID: 65 Comm: kworker/3:1 Not tainted 6.12.0-rc6-g255cf264e6e5-dirty #87\nHardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020\nWorkqueue: cifsiod smb2_cached_lease_break\nCall Trace:\n \n dump_stack_lvl+0x77/0xb0\n print_report+0xce/0x660\n kasan_report+0xd3/0x110\n smb2_cached_lease_break+0x27/0xb0\n process_one_work+0x50a/0xc50\n worker_thread+0x2ba/0x530\n kthread+0x17c/0x1c0\n ret_from_fork+0x34/0x60\n ret_from_fork_asm+0x1a/0x30\n \n\nAllocated by task 2464:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n open_cached_dir+0xa7d/0x1fb0\n smb2_query_path_info+0x43c/0x6e0\n cifs_get_fattr+0x346/0xf10\n cifs_get_inode_info+0x157/0x210\n cifs_revalidate_dentry_attr+0x2d1/0x460\n cifs_getattr+0x173/0x470\n vfs_statx_path+0x10f/0x160\n vfs_statx+0xe9/0x150\n vfs_fstatat+0x5e/0xc0\n __do_sys_newfstatat+0x91/0xf0\n do_syscall_64+0x95/0x1a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFreed by task 2464:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x51/0x70\n kfree+0x174/0x520\n open_cached_dir+0x97f/0x1fb0\n smb2_query_path_info+0x43c/0x6e0\n cifs_get_fattr+0x346/0xf10\n cifs_get_inode_info+0x157/0x210\n cifs_revalidate_dentry_attr+0x2d1/0x460\n cifs_getattr+0x173/0x470\n vfs_statx_path+0x10f/0x160\n vfs_statx+0xe9/0x150\n vfs_fstatat+0x5e/0xc0\n __do_sys_newfstatat+0x91/0xf0\n do_syscall_64+0x95/0x1a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nLast potentially related work creation:\n kasan_save_stack+0x33/0x60\n __kasan_record_aux_stack+0xad/0xc0\n insert_work+0x32/0x100\n __queue_work+0x5c9/0x870\n queue_work_on+0x82/0x90\n open_cached_dir+0x1369/0x1fb0\n smb2_query_path_info+0x43c/0x6e0\n cifs_get_fattr+0x346/0xf10\n cifs_get_inode_info+0x157/0x210\n cifs_revalidate_dentry_attr+0x2d1/0x460\n cifs_getattr+0x173/0x470\n vfs_statx_path+0x10f/0x160\n vfs_statx+0xe9/0x150\n vfs_fstatat+0x5e/0xc0\n __do_sys_newfstatat+0x91/0xf0\n do_syscall_64+0x95/0x1a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe buggy address belongs to the object at ffff88811cc24c00\n which belongs to the cache kmalloc-1k of size 1024\nThe buggy address is located 16 bytes inside of\n freed 1024-byte region [ffff88811cc24c00, ffff88811cc25000)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The UAF is driven entirely by data received from a remote SMB server over TCP/445 — a crafted SMB2 CREATE/QUERY_INFO response that forces the error path, plus an unsolicited SMB2 lease-break packet processed by the cifsd demultiplex thread. No local access to the victim is needed.\nAC:L - The malicious server controls both sides of the race: it makes the response fail parsing deterministically (short FILE_ALL_INFORMATION or a lease lacking READ caching) and it chooses exactly when to send the lease break, using the lease key the client disclosed in its own CREATE request. It gets unlimited retries via every directory access and every server-forced reconnect.\nPR:N - The attacker is the SMB server (or a MITM on an unsigned connection) and holds no privileges on the victim host; it is the authenticating party and can accept any credentials the client offers. The vulnerable code is reached automatically at tree connect (smb3_qfs_tcon → open_cached_dir) with no client-side account required.\nUI:N - Against an existing CIFS mount — the realistic case of an enterprise/cloud host mounting a file server that is compromised or MITM'd, or an autofs/systemd mount — the server triggers the bug at will, including by forcing reconnects that re-enter open_cached_dir(). No victim action is required at exploitation time.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed kmalloc-1k cached_fid is subsequently read by smb2_cached_lease_break(), which dereferences cfid->cfids and later cfid->dentry/cfid->tcon; with heap spray this yields attacker-directed reads of kernel memory and leaks of kernel pointers.\nI:H - The stale reference produces a write into freed memory (atomic kref decrement) and, on reaching zero, list_del(&cfid->entry) — a classic write-what-where unlink — plus dput() on a sprayed dentry, giving heap-spray-based arbitrary write and control-flow hijack potential.\nA:H - Even unweaponized, the use-after-free causes a spinlock acquisition and refcount manipulation on freed memory, reliably producing kernel oops/panic, and the server can retrigger it repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/cached_dir.c" ], "versions": [ { "version": "93877b9afc2994c89362007aac480a7b150f386f", "lessThan": "791f833053578b9fd24252ebb7162a61bc3f805b", "status": "affected", "versionType": "git" }, { "version": "5c86919455c1edec99ebd3338ad213b59271a71b", "lessThan": "97e2afcac0bebfef6a5360f4267ce4c44507b845", "status": "affected", "versionType": "git" }, { "version": "5c86919455c1edec99ebd3338ad213b59271a71b", "lessThan": "47655a12c6b1bca8fa230085eab2e85a076932b7", "status": "affected", "versionType": "git" }, { "version": "5c86919455c1edec99ebd3338ad213b59271a71b", "lessThan": "a9685b409a03b73d2980bbfa53eb47555802d0a9", "status": "affected", "versionType": "git" }, { "version": "6db94d08359c43f2c8fe372811cdee04564a41b9", "status": "affected", "versionType": "git" }, { "version": "6.6.3", "lessThan": "6.6.64", "status": "affected", "versionType": "semver" }, { "version": "6.5.13", "lessThan": "6.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/cached_dir.c" ], "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "6.6.3", "versionEndExcluding": "6.6.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.11.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/791f833053578b9fd24252ebb7162a61bc3f805b" }, { "url": "https://git.kernel.org/stable/c/97e2afcac0bebfef6a5360f4267ce4c44507b845" }, { "url": "https://git.kernel.org/stable/c/47655a12c6b1bca8fa230085eab2e85a076932b7" }, { "url": "https://git.kernel.org/stable/c/a9685b409a03b73d2980bbfa53eb47555802d0a9" } ], "title": "smb: prevent use-after-free due to open_cached_dir error paths", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-53177", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-11T15:43:30.968681Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-11T15:45:26.716Z" } } ] } }