CVE-2025-21993
High
Description
In the Linux kernel, the following vulnerability has been resolved: iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message.
SeverityHigh
CVSS7.1
Exploit probability—
Product
Linux Kernel
PublishedApr 2, 2025
First seenApr 2, 2025
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- linux linux_kernel6.1.132, 6.6.84, 6.12.20, 6.13.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 6.1.132, 6.2 ≤ v < 6.6.84, 6.7 ≤ v < 6.12.20, 6.13 ≤ v < 6.13.8, 6.14 | 6.1.132, 6.6.84, 6.12.20, 6.13.8 |
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