CVE-2025-21993 (GCVE-0-2025-21993)

Vulnerability from cvelistv5 – Published: 2025-04-02 12:53 – Updated: 2026-05-11 21:10
VLAI
Title
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 17:13 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < a858cd58dea06cf85b142673deea8c5d87f11e70 (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < f763c82db8166e28f45b7cc4a5398a7859665940 (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < b388e185bfad32bfed6a97a6817f74ca00a4318f (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < 9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < b253660fac5e0e9080d2c95e3a029e1898d49afb (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < c1c6e527470e5eab0b2d57bd073530fbace39eab (git)
Affected: 138fe4e069798d9aa948a5402ff15e58f483ee4e , < 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.4.292 , ≤ 5.4.* (semver)
Unaffected: 5.10.236 , ≤ 5.10.* (semver)
Unaffected: 5.15.180 , ≤ 5.15.* (semver)
Unaffected: 6.1.132 , ≤ 6.1.* (semver)
Unaffected: 6.6.84 , ≤ 6.6.* (semver)
Unaffected: 6.12.20 , ≤ 6.12.* (semver)
Unaffected: 6.13.8 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21993.json",
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      "status": "interim",
      "title": "SUSE CVE CVE-2025-21993",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21993.json",
      "version": "53"
    },
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        "dateReserved": "2024-12-29T08:45:45.801Z",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.