CVE-2025-40357— net/smc: fix general protection fault in __smc_diag_dump
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于__smc_diag_dump中存在内存访问问题，可能导致内核崩溃。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | d25a92ccae6bed02327b63d138e12e7806830f78< 5b6fc95c4a161326567bdf12a333768565b638f2 |
affected |
d25a92ccae6bed02327b63d138e12e7806830f78< 99b5b3faf3220ba1cdab8e6e42be4f3f993937c3 |
affected | ||
d25a92ccae6bed02327b63d138e12e7806830f78< f584239a9ed25057496bf397c370cc5163dde419 |
affected | ||
6.11 |
affected | ||
< 6.11 |
unaffected | ||
6.12.56≤ 6.12.* |
unaffected | ||
6.17.6≤ 6.17.* |
unaffected | ||
6.18≤ * |
unaffected |
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I. Basic Information for CVE-2025-40357
Vulnerability Information
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Vulnerability Title
net/smc: fix general protection fault in __smc_diag_dump
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix general protection fault in __smc_diag_dump
The syzbot report a crash:
Oops: general protection fault, probably for non-canonical address 0xfbd5a5d5a0000003: 0000 [#1] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0xdead4ead00000018-0xdead4ead0000001f]
CPU: 1 UID: 0 PID: 6949 Comm: syz.0.335 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
RIP: 0010:__smc_diag_dump.constprop.0+0x3ca/0x2550 net/smc/smc_diag.c:89
Call Trace:
<TASK>
smc_diag_dump_proto+0x26d/0x420 net/smc/smc_diag.c:217
smc_diag_dump+0x27/0x90 net/smc/smc_diag.c:234
netlink_dump+0x539/0xd30 net/netlink/af_netlink.c:2327
__netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2442
netlink_dump_start include/linux/netlink.h:341 [inline]
smc_diag_handler_dump+0x1f9/0x240 net/smc/smc_diag.c:251
__sock_diag_cmd net/core/sock_diag.c:249 [inline]
sock_diag_rcv_msg+0x438/0x790 net/core/sock_diag.c:285
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
____sys_sendmsg+0xa95/0xc70 net/socket.c:2614
___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
__sys_sendmsg+0x16d/0x220 net/socket.c:2700
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
The process like this:
(CPU1) | (CPU2)
---------------------------------|-------------------------------
inet_create() |
// init clcsock to NULL |
sk = sk_alloc() |
|
// unexpectedly change clcsock |
inet_init_csk_locks() |
|
// add sk to hash table |
smc_inet_init_sock() |
smc_sk_init() |
smc_hash_sk() |
| // traverse the hash table
| smc_diag_dump_proto
| __smc_diag_dump()
| // visit wrong clcsock
| smc_diag_msg_common_fill()
// alloc clcsock |
smc_create_clcsk |
sock_create_kern |
With CONFIG_DEBUG_LOCK_ALLOC=y, the smc->clcsock is unexpectedly changed
in inet_init_csk_locks(). The INET_PROTOSW_ICSK flag is no need by smc,
just remove it.
After removing the INET_PROTOSW_ICSK flag, this patch alse revert
commit 6fd27ea183c2 ("net/smc: fix lacks of icsk_syn_mss with IPPROTO_SMC")
to avoid casting smc_sock to inet_connection_sock.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于__smc_diag_dump中存在内存访问问题，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40357
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Other References for CVE-2025-40357 (3)
Same Patch Batch · Linux · 2025-12-16 · 156 CVEs total
| CVE-2025-68263 | 9.8 CRITICAL | ksmbd: ipc: fix use-after-free in ipc_msg_send_request |
| CVE-2025-68284 | 9.8 CRITICAL | libceph: prevent potential out-of-bounds writes in handle_auth_session_key() |
| CVE-2025-68315 | 9.8 CRITICAL | f2fs: fix to detect potential corrupted nid in free_nid_list |
| CVE-2025-68192 | 9.8 CRITICAL | net: usb: qmi_wwan: initialize MAC header offset in qmimux_rx_fixup |
| CVE-2025-68301 | 9.8 CRITICAL | net: atlantic: fix fragment overflow handling in RX path |
| CVE-2025-68285 | 9.8 CRITICAL | libceph: fix potential use-after-free in have_mon_and_osd_map() |
| CVE-2025-40350 | 9.8 CRITICAL | net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ |
| CVE-2025-68256 | 8.8 HIGH | staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser |
| CVE-2025-68314 | 8.8 HIGH | drm/msm: make sure last_fence is always updated |
| CVE-2025-68304 | 8.8 HIGH | Bluetooth: hci_core: lookup hci_conn on RX path on protocol side |
| CVE-2025-68255 | 8.8 HIGH | staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing |
| CVE-2025-68226 | 8.8 HIGH | smb: client: fix incomplete backport in cfids_invalidation_worker() |
| CVE-2025-40362 | 8.8 HIGH | ceph: fix multifs mds auth caps issue |
| CVE-2025-68250 | 8.2 HIGH | hung_task: fix warnings caused by unaligned lock pointers |
| CVE-2025-68207 | 7.8 HIGH | drm/xe/guc: Synchronize Dead CT worker with unbind |
| CVE-2025-68265 | 7.8 HIGH | nvme: fix admin request_queue lifetime |
| CVE-2025-68179 | 7.8 HIGH | s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP |
| CVE-2025-68189 | 7.8 HIGH | drm/msm: Fix GEM free for imported dma-bufs |
| CVE-2025-68181 | 7.8 HIGH | drm/radeon: Remove calls to drm_put_dev() |
| CVE-2025-68183 | 7.8 HIGH | ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr |
Showing top 20 of 156 CVEs. View all on vendor page → →
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Same vendor: Linux
-
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bpf: Infer zext_dst based on static register liveness analys -
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V. Comments for CVE-2025-40357
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