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CVE-2026-31693— cifs: some missing initializations on replay

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，该漏洞源于在重放请求时某些局部变量未正确初始化，可能导致未定义行为。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 433042a91f9373241307725b52de573933ffedbf< c854ab481ece4b3e5f4c2e8b22824f015ff874a5 affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 1d731e512134495e0ef490ade0e4d91dc0d515ec affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 7c9ce68192eef14c777cb6ce17155d2eb2431aea affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< c99e160938b627f6f28edee930e8abc157e84386 affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 14f66f44646333d2bfd7ece36585874fd72f8286 affected
6.6.32< 6.6.128 affected
6.8 affected
< 6.8 unaffected
… +5 more rows
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I. Basic Information for CVE-2026-31693

Vulnerability Information
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Vulnerability Title
cifs: some missing initializations on replay
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: some missing initializations on replay In several places in the code, we have a label to signify the start of the code where a request can be replayed if necessary. However, some of these places were missing the necessary reinitializations of certain local variables before replay. This change makes sure that these variables get initialized after the label.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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，该漏洞源于在重放请求时某些局部变量未正确初始化，可能导致未定义行为。
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 433042a91f9373241307725b52de573933ffedbf ~ c854ab481ece4b3e5f4c2e8b22824f015ff874a5 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-31693

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III. Intelligence Information for CVE-2026-31693

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Patches & Fixes for CVE-2026-31693 (5)

Same Patch Batch · Linux · 2026-04-30 · 4 CVEs total

CVE-2026-31786 7.8 HIGH Buffer overflow in drivers/xen/sys-hypervisor.c
CVE-2026-31692 rtnetlink: add missing netlink_ns_capable() check for peer netns
CVE-2026-31787 xen/privcmd: fix double free via VMA splitting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31693

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