CVE-2023-3865

ksmbd: fix out-of-bound read in smb2_write

HIGH

7.1

CVSS Score

Published: August 16, 2025 at 01:27 PM UTC

Updated: August 15, 2026 at 01:17 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.1

Exploit prediction

EPSS 0.6%

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bound read in smb2_write ksmbd_smb2_check_message doesn't validate hdr->NextCommand. If ->NextCommand is bigger than Offset + Length of smb2 write, It will allow oversized smb2 write length. It will cause OOB read in smb2_write.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

5.15 ≤ v < 5.15.1215.15 ≤ v < 6.1.365.15 ≤ v < 6.3.105.15 ≤ v < 6.45.16 ≤ v < 6.1.366.2 ≤ v < 6.3.106.4 rc1 6.4 rc2 6.4 rc3 6.4 rc4 6.4 rc5 6.4 rc6 6.4 rc7e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9

Vendor states this is fixed in 3813eee5154d6a4c5875cb4444cb2b63bac8947f (fixed)

Vendor states this is fixed in 58a9c41064df27632e780c5a3ae3e0e4284957d1 (fixed)

Vendor states this is fixed in 5fe7f7b78290638806211046a99f031ff26164e1 (fixed)

Vendor states this is fixed in c86211159bc3178b891e0d60e586a32c7b6a231b (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 5.15.121 (unaffected)

Vendor states this is fixed in 6.1.36 (unaffected)

Vendor states this is fixed in 6.3.10 (unaffected)

Vendor states this is fixed in 6.4 (unaffected)