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CVE-2025-22074— ksmbd: fix r_count dec/increment mismatch

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ksmbd中r_count增减不匹配，可能导致负数计数和线程终止问题。

CVSS 8.8 · High EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 09aeab68033161cb54f194da93e51a11aee6144b< 4790bcb269e5d6d88200a67c54ae6d627332a3be affected
a4261bbc33fbf99b99c80aa3a2c5097611802980< 457db486203c90e10c3efc87fd45cc7000b1cd36 affected
f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa< 20378cf48359f39dee0ef9b61470ebe77bd49c0d affected
3aa660c059240e0c795217182cf7df32909dd917< c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9 affected
3aa660c059240e0c795217182cf7df32909dd917< ddb7ea36ba7129c2ed107e2186591128618864e1 affected
6.6.84< 6.6.87 affected
6.12.20< 6.12.23 affected
6.13.8< 6.13.11 affected
… +7 more rows
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I. Basic Information for CVE-2025-22074

Vulnerability Information
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Vulnerability Title
ksmbd: fix r_count dec/increment mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix r_count dec/increment mismatch r_count is only increased when there is an oplock break wait, so r_count inc/decrement are not paired. This can cause r_count to become negative, which can lead to a problem where the ksmbd thread does not terminate.
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中r_count增减不匹配，可能导致负数计数和线程终止问题。
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 09aeab68033161cb54f194da93e51a11aee6144b ~ 4790bcb269e5d6d88200a67c54ae6d627332a3be -
Linux Linux 6.14 -

II. Public POCs for CVE-2025-22074

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III. Intelligence Information for CVE-2025-22074

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Other References for CVE-2025-22074 (4)

Same Patch Batch · Linux · 2025-04-16 · 127 CVEs total

CVE-2025-22021 10.0 CRITICAL netfilter: socket: Lookup orig tuple for IPv6 SNAT
CVE-2025-22077 9.8 CRITICAL Revert "smb: client: fix TCP timers deadlock after rmmod"
CVE-2025-22110 9.8 CRITICAL netfilter: nfnetlink_queue: Initialize ctx to avoid memory allocation error
CVE-2025-22088 9.8 CRITICAL RDMA/erdma: Prevent use-after-free in erdma_accept_newconn()
CVE-2025-22118 8.8 HIGH ice: validate queue quanta parameters to prevent OOB access
CVE-2025-22040 8.8 HIGH ksmbd: fix session use-after-free in multichannel connection
CVE-2025-22041 8.8 HIGH ksmbd: fix use-after-free in ksmbd_sessions_deregister()
CVE-2025-22039 8.8 HIGH ksmbd: fix overflow in dacloffset bounds check
CVE-2025-22086 8.8 HIGH RDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow
CVE-2024-58096 8.8 HIGH wifi: ath11k: add srng->lock for ath11k_hal_srng_* in monitor mode
CVE-2025-23133 8.8 HIGH wifi: ath11k: update channel list in reg notifier instead reg worker
CVE-2025-22117 8.7 HIGH ice: fix using untrusted value of pkt_len in ice_vc_fdir_parse_raw()
CVE-2025-22108 8.6 HIGH bnxt_en: Mask the bd_cnt field in the TX BD properly
CVE-2025-22121 8.4 HIGH ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()
CVE-2025-22080 8.4 HIGH fs/ntfs3: Prevent integer overflow in hdr_first_de()
CVE-2025-22038 8.3 HIGH ksmbd: validate zero num_subauth before sub_auth is accessed
CVE-2025-22042 8.1 HIGH ksmbd: add bounds check for create lease context
CVE-2025-22043 8.1 HIGH ksmbd: add bounds check for durable handle context
CVE-2025-22124 7.8 HIGH md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb
CVE-2025-22115 7.8 HIGH btrfs: fix block group refcount race in btrfs_create_pending_block_groups()

Showing top 20 of 127 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-22074

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