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Vulnerability record · CVE-2026-46149 · published 28 May 2026

CVE-2026-46149: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.14% · top 97.3% CWE-674 · CWE-674
7.1CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/00d91bfdce5033f5d9b4915638ae9b0553848b5d Patch
https://git.kernel.org/stable/c/12f2201a56957ba020392223a7393a5eba080c1b Patch
https://git.kernel.org/stable/c/1f678d13e939f91840cb1ebe9b88544923539d3c Patch
https://git.kernel.org/stable/c/72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e Patch
https://git.kernel.org/stable/c/772a896a56e0e3ef9424a025cec9176f9d8f4552 Patch
https://git.kernel.org/stable/c/d3cc9d490c207d57a289054397349f6f8c90354e Patch
https://git.kernel.org/stable/c/db0a4759d62cad4ff891e2d81ae4be73bb57f4a4 Patch
https://git.kernel.org/stable/c/e501154f9d82c95d2719bcbbaf679d8fd3226ef7 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46149), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.