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Linux Kernel SCSI Driver Buffer Overflow Risk
published 1 year ago
Summary
A security issue has been fixed in the Linux kernel's SCSI driver, which could allow malicious input to overflow a buffer and potentially cause system instability. This issue affected systems using the SCSI target core configuration file system. The fix involves adding a check to prevent the buffer overflow, and users should update their Linux kernel to a fixed version to address this risk.
What to do
- Update linux kernel to version 6.17.1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Linux | linux | kernel |
>= 6.17.0, < 6.17.1 Fix: upgrade to 6.17.1
|
Original advisory text
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
A buffer overflow arises from the usage of snprintf to write into the
buffer "buf" in target_lu_gp_members_show function located in
/drivers/target/target_core_configfs.c. This buffer is allocated with
size LU_GROUP_NAME_BUF (256 bytes).
snprintf(...) formats multiple strings into buf with the HBA name
(hba->hba_group.cg_item), a slash character, a devicename (dev->
dev_group.cg_item) and a newline character, the total formatted string
length may exceed the buffer size of 256 bytes.
Since snprintf() returns the total number of bytes that would have been
written (the length of %s/%sn ), this value may exceed the buffer length
(256 bytes) passed to memcpy(), this will ultimately cause function
memcpy reporting a buffer overflow error.
An additional check of the return value of snprintf() can avoid this
buffer overflow.
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
A buffer overflow arises from the usage of snprintf to write into the
buffer "buf" in target_lu_gp_members_show function located in
/drivers/target/target_core_configfs.c. This buffer is allocated with
size LU_GROUP_NAME_BUF (256 bytes).
snprintf(...) formats multiple strings into buf with the HBA name
(hba->hba_group.cg_item), a slash character, a devicename (dev->
dev_group.cg_item) and a newline character, the total formatted string
length may exceed the buffer size of 256 bytes.
Since snprintf() returns the total number of bytes that would have been
written (the length of %s/%sn ), this value may exceed the buffer length
(256 bytes) passed to memcpy(), this will ultimately cause function
memcpy reporting a buffer overflow error.
An additional check of the return value of snprintf() can avoid this
buffer overflow.
References
- https://git.kernel.org/stable/c/27e06650a5eafe832a90fd2604f0c5e920857fae URL
- https://git.kernel.org/stable/c/4b292286949588bd2818e66ff102db278de8dd26 URL
- https://git.kernel.org/stable/c/53c6351597e6a17ec6619f6f060d54128cb9a187 URL
- https://git.kernel.org/stable/c/764a91e2fc9639e07aac93bc70e387e6b1e33084 URL
- https://git.kernel.org/stable/c/a150275831b765b0f1de8b8ff52ec5c6933ac15d URL
- https://git.kernel.org/stable/c/ddc79fba132b807ff775467acceaf48b456e008b URL
- https://git.kernel.org/stable/c/e6eeee5dc0d9221ff96d1b229b1d0222c8871b84 URL
- https://git.kernel.org/stable/c/e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4 URL
- https://git.kernel.org/stable/c/f03aa5e39da7d045615b3951d2a6ca1d7132f881 URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39998... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-39998 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Timeline
Published15 Oct 2025
Updated18 Apr 2026
First seen18 Apr 2026
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