Out-of-bounds read in Linux kernel - CVE-2026-68343

Vulnerability identifier: #VU141714

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68343

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause an out-of-bounds read.

The vulnerability exists due to an out-of-bounds read in parse_dfs_referrals() in the SMB client DFS referral parser when processing a malformed DFS referral response with an oversized PathConsumed value. A remote attacker can send a specially crafted DFS referral response to cause an out-of-bounds read.

The issue occurs when PathConsumed is larger than the search name length used for later DFS path parsing.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel (Red Hat package)
kernel-rt (Red Hat package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - update to 4.18.0-553.160.1.el8_10
kernel-rt (Red Hat package) - update to 4.18.0-553.160.1.rt7.501.el8_10

• https://git.kernel.org/stable/c/285bd4a5f3f156aa5869843b47a1b1380b774241
• https://git.kernel.org/stable/c/2fdd6d196c656b376cc251e1e9ff110b3ed522e1
• https://git.kernel.org/stable/c/5b439f39f33ec15d319ced3b025e122346fba987
• https://git.kernel.org/stable/c/9f88a99ed511651b2dc2177d6854b2d1b8322e75
• https://git.kernel.org/stable/c/f6f5ee2aa33b350c671721b965251c42cebb962e

• Out-of-bounds read in Linux kernel smb client
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel