CVE-2025-21993

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Source
https://cve.org/CVERecord?id=CVE-2025-21993
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21993.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21993
Downstream
Related
Published
2025-04-02T12:53:15.513Z
Modified
2026-03-11T07:44:37.695415Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
Details

In the Linux kernel, the following vulnerability has been resolved:

iscsiibft: Fix UBSAN shift-out-of-bounds warning in ibftattrshownic()

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21993.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
138fe4e069798d9aa948a5402ff15e58f483ee4e
Fixed
a858cd58dea06cf85b142673deea8c5d87f11e70
Fixed
f763c82db8166e28f45b7cc4a5398a7859665940
Fixed
b388e185bfad32bfed6a97a6817f74ca00a4318f
Fixed
9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c
Fixed
2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d
Fixed
b253660fac5e0e9080d2c95e3a029e1898d49afb
Fixed
c1c6e527470e5eab0b2d57bd073530fbace39eab
Fixed
07e0d99a2f701123ad3104c0f1a1e66bce74d6e5

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21993.json"