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CVE-2025-37947— ksmbd: prevent out-of-bounds stream writes by validating *pos

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
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ksmbd_vfs_stream_write未验证pos导致越界写入。

CVSS 8.8 · High EPSS 0.65% · P50

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf< 7f61da79df86fd140c7768e668ad846bfa7ec8e1 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 04c8a38c60346bb5a7c49b276de7233f703ce9cb affected
0626e6641f6b467447c81dd7678a69c66f7746cf< d62ba16563a86aae052f96d270b3b6f78fca154c affected
0626e6641f6b467447c81dd7678a69c66f7746cf< e6356499fd216ed6343ae0363f4c9303f02c5034 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 0ca6df4f40cf4c32487944aaf48319cb6c25accc affected
5.15 affected
< 5.15 unaffected
6.1.139≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-37947

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ksmbd: prevent out-of-bounds stream writes by validating *pos
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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ksmbd_vfs_stream_write未验证pos导致越界写入。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf ~ 7f61da79df86fd140c7768e668ad846bfa7ec8e1 -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-37947

# POC Description Source Link Shenlong Link
1 Blog Post: https://blog.doyensec.com/2025/10/08/ksmbd-3.html https://github.com/doyensec/KSMBD-CVE-2025-37947 POC Details
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III. Intelligence Information for CVE-2025-37947

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Same Patch Batch · Linux · 2025-05-20 · 95 CVEs total

CVE-2025-37894 9.8 CRITICAL net: use sock_gen_put() when sk_state is TCP_TIME_WAIT
CVE-2025-37924 9.8 CRITICAL ksmbd: fix use-after-free in kerberos authentication
CVE-2025-37935 9.8 CRITICAL net: ethernet: mtk_eth_soc: fix SER panic with 4GB+ RAM
CVE-2025-37959 9.4 CRITICAL bpf: Scrub packet on bpf_redirect_peer
CVE-2025-37918 8.8 HIGH Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
CVE-2025-37899 8.8 HIGH ksmbd: fix use-after-free in session logoff
CVE-2025-37943 8.8 HIGH wifi: ath12k: Fix invalid data access in ath12k_dp_rx_h_undecap_nwifi
CVE-2025-37926 8.8 HIGH ksmbd: fix use-after-free in ksmbd_session_rpc_open
CVE-2025-37944 8.8 HIGH wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process
CVE-2025-37952 8.8 HIGH ksmbd: Fix UAF in __close_file_table_ids
CVE-2025-37956 8.8 HIGH ksmbd: prevent rename with empty string
CVE-2025-37957 8.8 HIGH KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception
CVE-2025-37936 8.7 HIGH perf/x86/intel: KVM: Mask PEBS_ENABLE loaded for guest with vCPU's value.
CVE-2025-37973 8.1 HIGH wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation
CVE-2025-37923 7.8 HIGH tracing: Fix oob write in trace_seq_to_buffer()
CVE-2025-37979 7.8 HIGH ASoC: qcom: Fix sc7280 lpass potential buffer overflow
CVE-2025-37920 7.8 HIGH xsk: Fix race condition in AF_XDP generic RX path
CVE-2025-37921 7.8 HIGH vxlan: vnifilter: Fix unlocked deletion of default FDB entry
CVE-2025-37964 7.8 HIGH x86/mm: Eliminate window where TLB flushes may be inadvertently skipped
CVE-2025-37901 7.8 HIGH irqchip/qcom-mpm: Prevent crash when trying to handle non-wake GPIOs

Showing top 20 of 95 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37947

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