CVE-2025-21993
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.26
References 8
git.kernel.org
- stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70
- stable/c/f763c82db8166e28f45b7cc4a5398a7859665940
- stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f
- stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c
- stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d
- stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb
- stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab
- stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5