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CVE-2025-71150— ksmbd: Fix refcount leak when invalid session is found on session lookup

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，该漏洞源于查找会话时发现无效会话未释放引用计数，可能导致引用计数泄漏。

CVSS 7.5 · High EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2107ab40629aeabbec369cf34b8cf0f288c3eb1b< 11fe566b442e3bc2774191740fd377739a87a1c0 affected
37a0e2b362b3150317fb6e2139de67b1e29ae5ff< 0fb87b28cafae71e9c8248432cc3a6a1fd759efc affected
450a844c045ff0895d41b05a1cbe8febd1acfcfd< e54fb2a4772545701766cba08aab20de5eace8cd affected
a39e31e22a535d47b14656a7d6a893c7f6cf758c< 02e06785e85b4bd86ef3d23b7c8d87acc76773d5 affected
b95629435b84b9ecc0c765995204a4d8a913ed52< 8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7 affected
b95629435b84b9ecc0c765995204a4d8a913ed52< cafb57f7bdd57abba87725eb4e82bbdca4959644 affected
5.15.176< 5.15.203 affected
6.1.121< 6.1.160 affected
… +10 more rows
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I. Basic Information for CVE-2025-71150

Vulnerability Information
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Vulnerability Title
ksmbd: Fix refcount leak when invalid session is found on session lookup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix refcount leak when invalid session is found on session lookup When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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，该漏洞源于查找会话时发现无效会话未释放引用计数，可能导致引用计数泄漏。
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 2107ab40629aeabbec369cf34b8cf0f288c3eb1b ~ 11fe566b442e3bc2774191740fd377739a87a1c0 -
Linux Linux 6.13 -

II. Public POCs for CVE-2025-71150

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III. Intelligence Information for CVE-2025-71150

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Same Patch Batch · Linux · 2026-01-23 · 34 CVEs total

CVE-2026-22984 9.8 CRITICAL libceph: prevent potential out-of-bounds reads in handle_auth_done()
CVE-2025-71159 9.8 CRITICAL btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()
CVE-2025-71145 7.8 HIGH usb: phy: isp1301: fix non-OF device reference imbalance
CVE-2026-22980 7.8 HIGH nfsd: provide locking for v4_end_grace
CVE-2025-71158 7.8 HIGH gpio: mpsse: ensure worker is torn down
CVE-2026-22988 7.8 HIGH arp: do not assume dev_hard_header() does not change skb->head
CVE-2025-71155 7.8 HIGH KVM: s390: Fix gmap_helper_zap_one_page() again
CVE-2025-71146 7.5 HIGH netfilter: nf_conncount: fix leaked ct in error paths
CVE-2025-71161 7.5 HIGH dm-verity: disable recursive forward error correction
CVE-2026-22990 7.5 HIGH libceph: replace overzealous BUG_ON in osdmap_apply_incremental()
CVE-2026-22991 7.5 HIGH libceph: make free_choose_arg_map() resilient to partial allocation
CVE-2026-22992 7.5 HIGH libceph: return the handler error from mon_handle_auth_done()
CVE-2026-22989 nfsd: check that server is running in unlock_filesystem
CVE-2026-22987 net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy
CVE-2026-22993 idpf: Fix RSS LUT NULL ptr issue after soft reset
CVE-2026-22986 gpiolib: fix race condition for gdev->srcu
CVE-2026-22985 idpf: Fix RSS LUT NULL pointer crash on early ethtool operations
CVE-2026-22994 bpf: Fix reference count leak in bpf_prog_test_run_xdp()
CVE-2026-22995 ublk: fix use-after-free in ublk_partition_scan_work
CVE-2026-22983 net: do not write to msg_get_inq in callee

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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