What’s Vulnerable › Vulnerabilities

CVE-2024-56626: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-27 · updated 2026-08-04
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write An offset from client could be a negative value, It could allows to write data outside the bounds of the allocated buffer. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.

Affected products

• Linux kernel: from 5.15 before 5.15.176; from 5.16 before 6.1.120; from 6.2 before 6.6.66; from 6.7 before 6.12.5; 6.13-rc1 — fixed in 5.15.176, 6.1.120, 6.12.5, 6.6.66

How to fix

Upgrade to a fixed version: Linux kernel 5.15.176, 6.1.120, 6.12.5, 6.6.66. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a
• https://git.kernel.org/stable/c/1aea5c9470be2c7129704fb1b9562b1e3e0576f8
• https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81
• https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca
• https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

Get alerted when CVE-2024-56626 or the next vulnerability affects your stack