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CVE-2025-40055— ocfs2: fix double free in user_cluster_connect()

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user_cluster_connect函数中存在双重释放问题。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 283333079d96c84baa91f0c62b5e0cbec246b7a2 affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< f992bc72f681c32a682d474a29c2135a64d4f4e5 affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 827c8efa0d1afe817b90f3618afff552e88348d2 affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< bfe011297ddd2d0cd64752978baaa0c04cd20573 affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2 affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 694d5b401036a614f8080085a9de6f86ff0742dc affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 892f41e12c8689130d552a9eb2b77bafd26484ab affected
c994c2ebdbbc391a42f177c8eb7882ebf3f142d8< 8f45f089337d924db24397f55697cda0e6960516 affected
… +10 more rows
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I. Basic Information for CVE-2025-40055

Vulnerability Information
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Vulnerability Title
ocfs2: fix double free in user_cluster_connect()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix double free in user_cluster_connect() user_cluster_disconnect() frees "conn->cc_private" which is "lc" but then the error handling frees "lc" a second time. Set "lc" to NULL on this path to avoid a double free.
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user_cluster_connect函数中存在双重释放问题。
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 c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 ~ 283333079d96c84baa91f0c62b5e0cbec246b7a2 -
Linux Linux 3.14 -

II. Public POCs for CVE-2025-40055

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III. Intelligence Information for CVE-2025-40055

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Patches & Fixes for CVE-2025-40055 (2)

Same Patch Batch · Linux · 2025-10-28 · 58 CVEs total

CVE-2025-40074 9.8 CRITICAL ipv4: start using dst_dev_rcu()
CVE-2025-40043 8.8 HIGH net: nfc: nci: Add parameter validation for packet data
CVE-2025-40039 8.8 HIGH ksmbd: Fix race condition in RPC handle list access
CVE-2025-40058 8.8 HIGH iommu/vt-d: Disallow dirty tracking if incoherent page walk
CVE-2025-40046 8.6 HIGH io_uring/zcrx: fix overshooting recv limit
CVE-2025-40068 8.4 HIGH fs: ntfs3: Fix integer overflow in run_unpack()
CVE-2025-40075 8.1 HIGH tcp_metrics: use dst_dev_net_rcu()
CVE-2025-40026 7.9 HIGH KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O
CVE-2025-40027 7.8 HIGH net/9p: fix double req put in p9_fd_cancelled
CVE-2025-40051 7.8 HIGH vhost: vringh: Modify the return value check
CVE-2025-40061 7.8 HIGH RDMA/rxe: Fix race in do_task() when draining
CVE-2025-40081 7.8 HIGH perf: arm_spe: Prevent overflow in PERF_IDX2OFF()
CVE-2025-40079 7.8 HIGH riscv, bpf: Sign extend struct ops return values properly
CVE-2025-40028 7.8 HIGH binder: fix double-free in dbitmap
CVE-2025-40041 7.8 HIGH LoongArch: BPF: Sign-extend struct ops return values properly
CVE-2025-40054 7.8 HIGH f2fs: fix UAF issue in f2fs_merge_page_bio()
CVE-2025-40044 7.8 HIGH fs: udf: fix OOB read in lengthAllocDescs handling
CVE-2025-40045 7.8 HIGH ASoC: codecs: wcd937x: set the comp soundwire port correctly
CVE-2025-40025 7.8 HIGH f2fs: fix to do sanity check on node footer for non inode dnode
CVE-2025-40047 7.8 HIGH io_uring/waitid: always prune wait queue entry in io_waitid_wait()

Showing top 20 of 58 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40055

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