CVE-2026-46149
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel within the tg_pt_gp_members_show() function, which may lead to reading data beyond the allocated stack buffer. The issue arises from an improper length check on the data returned by snprintf(), potentially resulting in copying adjacent stack data.
Risk Assessment
This vulnerability may lead to the disclosure of sensitive information within the system, posing a risk to data integrity and confidentiality. If CONFIG_FORTIFY_SOURCE is enabled, it may also trigger a system panic.
Recommendation
It is recommended to update the Linux kernel to a version that includes the fix to eliminate this vulnerability. Additionally, monitor systems for potential exploits related to this flaw.
Original NVD description (English source)
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.