8.8

CVE-2026-43112

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

In the Linux kernel, the following vulnerability has been resolved:

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

When cifs_sanitize_prepath is called with an empty string or a string
containing only delimiters (e.g., "/"), the current logic attempts to
check *(cursor2 - 1) before cursor2 has advanced. This results in an
out-of-bounds read.

This patch adds an early exit check after stripping prepended
delimiters. If no path content remains, the function returns NULL.

The bug was identified via manual audit and verified using a
standalone test case compiled with AddressSanitizer, which
triggered a SEGV on affected inputs.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.16.1 < 6.6.136
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.83
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.24
Linux ≫ Linux Kernel Version >= 6.19 < 6.19.14
Linux ≫ Linux Kernel Version5.16 Update-
Linux ≫ Linux Kernel Version5.16 Updaterc6
Linux ≫ Linux Kernel Version5.16 Updaterc7
Linux ≫ Linux Kernel Version5.16 Updaterc8
Linux ≫ Linux Kernel Version7.0 Updaterc1
Linux ≫ Linux Kernel Version7.0 Updaterc2
Linux ≫ Linux Kernel Version7.0 Updaterc3
Linux ≫ Linux Kernel Version7.0 Updaterc4
Linux ≫ Linux Kernel Version7.0 Updaterc5
Linux ≫ Linux Kernel Version7.0 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.35% 0.273
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 8.1 2.8 5.2
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

https://git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95
Patch
https://git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439
Patch
https://git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010
Patch
https://git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3
Patch
https://git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317
Patch
https://git.kernel.org/stable/c/a2ba20c17de8eb028f96b1d85f119d3d25655bd9
https://git.kernel.org/stable/c/fbced33599653471b4581dfe1abc7b467031f126
https://bugzilla.redhat.com/show_bug.cgi?id=2467015
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43112.json
https://access.redhat.com/errata/RHSA-2026:34911
https://access.redhat.com/errata/RHSA-2026:36018
https://access.redhat.com/security/cve/CVE-2026-43112
https://access.redhat.com/errata/RHSA-2026:36365
https://access.redhat.com/errata/RHSA-2026:36366