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CVE-2025-40063— crypto: comp - Use same definition of context alloc and free ops

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alloc_ctx和free_ctx操作定义不一致，可能导致结构布局随机化问题。

CVSS 7.0 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 42d9f6c774790d290c175e8775ce9f1366438098< 779d3b6f2d32c5f1da6163e959abe1e1ffe2945b affected
42d9f6c774790d290c175e8775ce9f1366438098< f75f66683ded09f7135aef2e763c245a07c8271a affected
6.16 affected
< 6.16 unaffected
6.17.3≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-40063

Vulnerability Information
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Vulnerability Title
crypto: comp - Use same definition of context alloc and free ops
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: comp - Use same definition of context alloc and free ops In commit 42d9f6c77479 ("crypto: acomp - Move scomp stream allocation code into acomp"), the crypto_acomp_streams struct was made to rely on having the alloc_ctx and free_ctx operations defined in the same order as the scomp_alg struct. But in that same commit, the alloc_ctx and free_ctx members of scomp_alg may be randomized by structure layout randomization, since they are contained in a pure ops structure (containing only function pointers). If the pointers within scomp_alg are randomized, but those in crypto_acomp_streams are not, then the order may no longer match. This fixes the problem by removing the union from scomp_alg so that both crypto_acomp_streams and scomp_alg will share the same definition of alloc_ctx and free_ctx, ensuring they will always have the same layout.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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alloc_ctx和free_ctx操作定义不一致，可能导致结构布局随机化问题。
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 42d9f6c774790d290c175e8775ce9f1366438098 ~ 779d3b6f2d32c5f1da6163e959abe1e1ffe2945b -
Linux Linux 6.16 -

II. Public POCs for CVE-2025-40063

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III. Intelligence Information for CVE-2025-40063

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Patches & Fixes for CVE-2025-40063 (1)

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-2025-40063

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