CVE-2026-46149 scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()
A local attacker can read adjacent stack memory or trigger a kernel panic via a long iSCSI IQN in the Linux kernel SCSI target subsystem.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46149?
CVE-2026-46149 is a high-severity vulnerability in Linux kernel, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()
target_tg_pt_gp_members_show() formats LUN paths with snprintf() into a 256-byte stack buffer, then will memcpy() cur_len bytes from that buffer. snprintf() returns the length the output would have had, which can exceed the buffer size when the fabric WWN is long because iSCSI IQN names can be up to 223 bytes. The check at the memcpy() site only guards the destination page write, not the source read, so memcpy() will read past the stack buffer and copy adjacent stack contents to the sysfs reader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic() will be triggered.
Commit 27e06650a5ea ("scsi: target: target_core_configfs: Add length check to avoid buffer overflow") added the same bound to the target_lu_gp_members_show() but the tg_pt_gp variant was missed so resolve that here.
Which versions are affected by CVE-2026-46149?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46149?
Apply the vendor's patch.
Is CVE-2026-46149 being exploited?
There is no known exploitation of CVE-2026-46149 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-89064, BELL-CVE-2026-46149, DEBIAN-CVE-2026-46149, GHSA-vvx9-xfcg-g62v, ROOT-OS-DEBIAN-11-CVE-2026-46149, ROOT-OS-DEBIAN-12-CVE-2026-46149 and 3 more.