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CVE-2025-37899— ksmbd: fix use-after-free in session logoff

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在会话注销时未正确处理sess->user引用，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf< 931dc8a3670f71c45c0b1379ea4e92dafbda1aca affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 70ad6455139e26e85f48f95d0e21f351c1909342 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< d5ec1d79509b3ee01de02c236f096bc050221b7f affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 02d16046cd11a5c037b28c12ffb818c56dd3ef43 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 2fc9feff45d92a92cd5f96487655d5be23fb7e2b affected
5.15 affected
< 5.15 unaffected
6.1.159≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-37899

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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: fix use-after-free in session logoff
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.
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在会话注销时未正确处理sess->user引用，可能导致释放后重用。
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 ~ 931dc8a3670f71c45c0b1379ea4e92dafbda1aca -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-37899

# POC Description Source Link Shenlong Link
1 Artefacts for blog post on finding CVE-2025-37899 with o3 https://github.com/SeanHeelan/o3_finds_cve-2025-37899 POC Details
2 None https://github.com/vett3x/SMB-LINUX-CVE-2025-37899 POC Details
3 Artefacts for blog post on finding CVE-2025-37899 with o3 https://github.com/ccss17/o3_finds_cve-2025-37899 POC Details
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III. Intelligence Information for CVE-2025-37899

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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-2025-37926 8.8 HIGH ksmbd: fix use-after-free in ksmbd_session_rpc_open
CVE-2025-37918 8.8 HIGH Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
CVE-2025-37944 8.8 HIGH wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process
CVE-2025-37943 8.8 HIGH wifi: ath12k: Fix invalid data access in ath12k_dp_rx_h_undecap_nwifi
CVE-2025-37947 8.8 HIGH ksmbd: prevent out-of-bounds stream writes by validating *pos
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-2025-37903 7.8 HIGH drm/amd/display: Fix slab-use-after-free in hdcp
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-2025-37923 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-2025-37901 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-2025-37899

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