CVE-2026-99157 scsi: bsg: Pass reply_len to bsg_setup_queue() to fit UFS ARPMB replies
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99157?
CVE-2026-99157 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: bsg: Pass reply_len to bsg_setup_queue() to fit UFS ARPMB replies
bsg-lib allocates a 96-byte (SCSI_SENSE_BUFFERSIZE) reply buffer per job, but struct ufs_rpmb_reply is 104 bytes: a 40-byte struct ufs_bsg_reply followed by a 64-byte EHS. When an Advanced RPMB command returns an EHS, ufshcd_advanced_rpmb_req_handler() copies it right after the 40-byte header and writes 8 bytes past the end of the buffer.
Let each BSG transport pass its reply buffer size to bsg_setup_queue() and have ufs_bsg request sizeof(struct ufs_rpmb_reply), so the full reply reaches user space. Other transports keep SCSI_SENSE_BUFFERSIZE.
Which versions are affected by CVE-2026-99157?
How do I fix CVE-2026-99157?
Upgrade to a fixed version.
Is CVE-2026-99157 being exploited?
There is no known exploitation of CVE-2026-99157 in the wild and no public exploit code.
Sources
Also known as AZL-111299, BELL-CVE-2026-99157, DEBIAN-CVE-2026-99157, GHSA-m9gv-84j2-4jhf, UBUNTU-CVE-2026-99157.