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 (v2.0.3)
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.
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[{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T17:13:21.283055Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:39:06.931Z\"}}], \"cna\": {\"title\": \"iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"a858cd58dea06cf85b142673deea8c5d87f11e70\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"f763c82db8166e28f45b7cc4a5398a7859665940\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"b388e185bfad32bfed6a97a6817f74ca00a4318f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"b253660fac5e0e9080d2c95e3a029e1898d49afb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"c1c6e527470e5eab0b2d57bd073530fbace39eab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"138fe4e069798d9aa948a5402ff15e58f483ee4e\", \"lessThan\": \"07e0d99a2f701123ad3104c0f1a1e66bce74d6e5\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/firmware/iscsi_ibft.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.26\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.26\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.132\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/firmware/iscsi_ibft.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a858cd58dea06cf85b142673deea8c5d87f11e70\"}, {\"url\": \"https://git.kernel.org/stable/c/f763c82db8166e28f45b7cc4a5398a7859665940\"}, {\"url\": \"https://git.kernel.org/stable/c/b388e185bfad32bfed6a97a6817f74ca00a4318f\"}, {\"url\": \"https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c\"}, {\"url\": \"https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d\"}, {\"url\": \"https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb\"}, {\"url\": \"https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab\"}, {\"url\": \"https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\niscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()\\n\\nWhen performing an iSCSI boot using IPv6, iscsistart still reads the\\n/sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix\\nlength is 64, this causes the shift exponent to become negative,\\ntriggering a UBSAN warning. As the concept of a subnet mask does not\\napply to IPv6, the value is set to ~0 to suppress the warning message.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.132\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.84\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.20\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.8\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"2.6.26\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-02T15:28:44.546Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21993\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-02T15:28:44.546Z\", \"dateReserved\": \"2024-12-29T08:45:45.801Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-02T12:53:15.513Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.