CVE-2025-21758 (GCVE-0-2025-21758)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-08-05 11:54
VLAI
Title
ipv6: mcast: add RCU protection to mld_newpack()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: add RCU protection to mld_newpack() mld_newpack() can be called without RTNL or RCU being held. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < 29fa42197f26a97cde29fa8c40beddf44ea5c8f3 (git)
Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < e8af3632a7f2da83e27b083f787bced1faba00b1 (git)
Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < 1b91c597b0214b1b462eb627ec02658c944623f2 (git)
Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < 25195f9d5ffcc8079ad743a50c0409dbdc48d98a (git)
Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < d60d493b0e65647e0335e6a7c4547abcea7df8e9 (git)
Affected: b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 , < a527750d877fd334de87eef81f1cb5f0f0ca3373 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (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: V3.1.5 , < * (custom)
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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: V3.1.5 , < * (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 SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (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": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:41:29+00:00",
      "cve": "CVE-2025-21758",
      "id": "CVE-2025-21758",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "118",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: mcast: add RCU protection to mld_newpack()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21758.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T01:05:39Z",
      "cve": "CVE-2025-21758",
      "id": "CVE-2025-21758",
      "initial_release_date": "2025-02-28T02:21:18Z",
      "product_status:known_affected": "684",
      "product_status:recommended": "458",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21758",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21758.json",
      "version": "52"
    }
  }
}



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Tags
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.