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vuln-cve/data/2025/38xxx/CVE-2025-38244.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38244",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.996Z",
"datePublished": "2025-07-09T10:42:26.622Z",
"dateUpdated": "2026-10-30T12:21:48.920Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:21:48.920Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential deadlock when reconnecting channels\n\nFix cifs_signal_cifsd_for_reconnect() to take the correct lock order\nand prevent the following deadlock from happening\n\n======================================================\nWARNING: possible circular locking dependency detected\n6.16.0-rc3-build2+ #1301 Tainted: G S W\n------------------------------------------------------\ncifsd/6055 is trying to acquire lock:\nffff88810ad56038 (&tcp_ses->srv_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x134/0x200\n\nbut task is already holding lock:\nffff888119c64330 (&ret_buf->chan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #2 (&ret_buf->chan_lock){+.+.}-{3:3}:\n validate_chain+0x1cf/0x270\n __lock_acquire+0x60e/0x780\n lock_acquire.part.0+0xb4/0x1f0\n _raw_spin_lock+0x2f/0x40\n cifs_setup_session+0x81/0x4b0\n cifs_get_smb_ses+0x771/0x900\n cifs_mount_get_session+0x7e/0x170\n cifs_mount+0x92/0x2d0\n cifs_smb3_do_mount+0x161/0x460\n smb3_get_tree+0x55/0x90\n vfs_get_tree+0x46/0x180\n do_new_mount+0x1b0/0x2e0\n path_mount+0x6ee/0x740\n do_mount+0x98/0xe0\n __do_sys_mount+0x148/0x180\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n-> #1 (&ret_buf->ses_lock){+.+.}-{3:3}:\n validate_chain+0x1cf/0x270\n __lock_acquire+0x60e/0x780\n lock_acquire.part.0+0xb4/0x1f0\n _raw_spin_lock+0x2f/0x40\n cifs_match_super+0x101/0x320\n sget+0xab/0x270\n cifs_smb3_do_mount+0x1e0/0x460\n smb3_get_tree+0x55/0x90\n vfs_get_tree+0x46/0x180\n do_new_mount+0x1b0/0x2e0\n path_mount+0x6ee/0x740\n do_mount+0x98/0xe0\n __do_sys_mount+0x148/0x180\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n-> #0 (&tcp_ses->srv_lock){+.+.}-{3:3}:\n check_noncircular+0x95/0xc0\n check_prev_add+0x115/0x2f0\n validate_chain+0x1cf/0x270\n __lock_acquire+0x60e/0x780\n lock_acquire.part.0+0xb4/0x1f0\n _raw_spin_lock+0x2f/0x40\n cifs_signal_cifsd_for_reconnect+0x134/0x200\n __cifs_reconnect+0x8f/0x500\n cifs_handle_standard+0x112/0x280\n cifs_demultiplex_thread+0x64d/0xbc0\n kthread+0x2f7/0x310\n ret_from_fork+0x2a/0x230\n ret_from_fork_asm+0x1a/0x30\n\nother info that might help us debug this:\n\nChain exists of:\n &tcp_ses->srv_lock --> &ret_buf->ses_lock --> &ret_buf->chan_lock\n\n Possible unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n lock(&ret_buf->chan_lock);\n lock(&ret_buf->ses_lock);\n lock(&ret_buf->chan_lock);\n lock(&tcp_ses->srv_lock);\n\n *** DEADLOCK ***\n\n3 locks held by cifsd/6055:\n #0: ffffffff857de398 (&cifs_tcp_ses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x7b/0x200\n #1: ffff888119c64060 (&ret_buf->ses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x9c/0x200\n #2: ffff888119c64330 (&ret_buf->chan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200"
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable function is reached from `cifs_demultiplex_thread` while parsing data received from a remote SMB server (short/oversized RFC1002 PDUs, malformed compound `next_header`, `STATUS_NETWORK_SESSION_EXPIRED`), so a malicious/compromised SMB server or an attacker injecting into an unsigned SMB connection triggers it over the network. The DFS-referral and SMB-witness callers are likewise driven by remote server responses.\nAC:L - The attacker can force `cifs_reconnect(server, true)` into the inverted `chan_lock → srv_lock` sequence deterministically and at unbounded rate with a single malformed response, and the reconnect storms he causes themselves drive the opposing `ses_lock → chan_lock` session-setup path on other channel threads. No rare kernel config is needed — the loop starts at index 0, so even a single-channel mount takes the inverted order.\nPR:N - The attacker needs no account or privilege on the victim client; the reconnect triggers are evaluated on the received header before signature verification in `handle_mid()`, and the demux thread runs from `cifs_get_tcp_session()` onward, making the path reachable pre-authentication.\nUI:N - On an already-mounted share — the normal enterprise/cloud case — a compromised server or on-path attacker triggers the path with no victim action at all; no new mount, file open, or any other local operation is required.\nS:U - The deadlock is confined to the kernel's own locking of the CIFS client and does not cross into another security authority such as a hypervisor or IOMMU boundary.\nC:N - This is purely a lock-acquisition-order defect; no memory is read out of bounds, no freed object is dereferenced, and no kernel data is exposed to the attacker.\nI:N - No memory is written out of bounds or after free and no control-flow structure is corrupted, so the bug yields no data-modification or write primitive.\nA:H - The circular dependency is between raw `spin_lock()`s, so closing the cycle spins CPUs with preemption disabled into an unrecoverable hard lockup that hangs the cifsd thread, the mount path, and the whole system; on `panic_on_warn` kernels the lockdep WARNING alone is an immediate panic."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/smb/client/cifsglob.h",
"fs/smb/client/connect.c"
],
"versions": [
{
"version": "d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8",
"lessThan": "35fe966449280bfdf4c1bc0c42e7f4672290515a",
"status": "affected",
"versionType": "git"
},
{
"version": "d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8",
"lessThan": "c82c7041258d96e3286f6790ab700e4edd3cc9e3",
"status": "affected",
"versionType": "git"
},
{
"version": "d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8",
"lessThan": "7f3ead8ebc0ef65b6c89a13912b4e80218425629",
"status": "affected",
"versionType": "git"
},
{
"version": "d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8",
"lessThan": "fe035dc78aa6ca8f862857d45beaf7a0e03206ca",
"status": "affected",
"versionType": "git"
},
{
"version": "d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8",
"lessThan": "711741f94ac3cf9f4e3aa73aa171e76d188c0819",
"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/smb/client/cifsglob.h",
"fs/smb/client/connect.c"
],
"versions": [
{
"version": "6.0",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.0",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.96",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.36",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.5",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16",
"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": "6.0",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.0",
"versionEndExcluding": "6.6.96"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.0",
"versionEndExcluding": "6.12.36"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.0",
"versionEndExcluding": "6.15.5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.0",
"versionEndExcluding": "6.16"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/35fe966449280bfdf4c1bc0c42e7f4672290515a"
},
{
"url": "https://git.kernel.org/stable/c/c82c7041258d96e3286f6790ab700e4edd3cc9e3"
},
{
"url": "https://git.kernel.org/stable/c/7f3ead8ebc0ef65b6c89a13912b4e80218425629"
},
{
"url": "https://git.kernel.org/stable/c/fe035dc78aa6ca8f862857d45beaf7a0e03206ca"
},
{
"url": "https://git.kernel.org/stable/c/711741f94ac3cf9f4e3aa73aa171e76d188c0819"
}
],
"title": "smb: client: fix potential deadlock when reconnecting channels",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2025-38244",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:48:51.630355Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T21:52:12.319Z"
}
}
]
}
}
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