CVE-2025-37947
In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.55% probability · 44th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cbPatch
- https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25acccPatch
- https://git.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1Patch
- https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154cPatch
- https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034Patch
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.htmlMailing List, Third Party Advisory
- https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.cMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.