CVE-2025-21764 (GCVE-0-2025-21764)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-07-14 12:40
VLAI
Title
ndisc: use RCU protection in ndisc_alloc_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: ndisc: use RCU protection in ndisc_alloc_skb() ndisc_alloc_skb() can be called without RTNL or RCU being held. Add RCU protection to avoid possible UAF.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < 96fc896d0e5b37c12808df797397fb16f3080879 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < c30893ef3d9cde8e7e8e4fd06b53d2c935bbccb1 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < b870256dd2a5648d5ed2f22316b3ac29a7e5ed63 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < 3c2d705f5adf5d860aaef90cb4211c0fde2ba66d (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < 9e0ec817eb41a55327a46cd3ce331a9868d60304 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < bbec88e4108e8d6fb468d3817fa652140a44ff28 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < cd1065f92eb7ff21b9ba5308a86f33d1670bf926 (git)
Affected: de09334b9326632bbf1a74bfd8b01866cbbf2f61 , < 628e6d18930bbd21f2d4562228afe27694f66da9 (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.79 , ≤ 6.6.* (semver)
Unaffected: 6.12.16 , ≤ 6.12.* (semver)
Unaffected: 6.13.4 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "redhat_vex": {
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      "current_release_date": "2026-06-29T23:59:12+00:00",
      "cve": "CVE-2025-21764",
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      "product_status:fixed": "1674",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21764.json",
      "version": "3"
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      "dataType": "CVE_RECORD",
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  }
}



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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.