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CVE-2025-21760 (GCVE-0-2025-21760)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-09-08 08:40
VLAI
Title
ndisc: extend RCU protection in ndisc_send_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a potential UAF.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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 · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 17:57 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < 10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1 (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < 4d576202b90b1b95a7c428a80b536f91b8201bcc (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < e24d225e4cb8cf108bde00b76594499b98f0a74d (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < ae38982f521621c216fc2f5182cd091f4734641d (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < 789230e5a8c1097301afc802e242c79bc8835c67 (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < 04e05112f10354ffc3bb6cc796d553bab161594c (git)
Affected: 1762f7e88eb34f653b4a915be99a102e347dd45e , < ed6ae1f325d3c43966ec1b62ac1459e2b8e45640 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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Adquiera rcu_read_lock() antes, para que podamos usar dev_net_rcu() y evitar un posible 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T10:26:53+00:00",
      "cve": "CVE-2025-21760",
      "id": "CVE-2025-21760",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ndisc: extend RCU protection in ndisc_send_skb()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21760.json",
      "version": "3"
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T01:28:02Z",
      "cve": "CVE-2025-21760",
      "id": "CVE-2025-21760",
      "initial_release_date": "2025-02-28T02:21:16Z",
      "product_status:known_affected": "632",
      "product_status:known_not_affected": "2",
      "product_status:recommended": "570",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21760",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21760.json",
      "version": "61"
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This matches the AV:N assessment of its direct IPv4 counterpart `arp_xmit()` in the same series.\\nAC:H - The stale `struct net` only becomes a use-after-free if the device\u0027s netns is concurrently dismantled (`dev_change_net_namespace()` from `default_device_exit_batch()` followed by `net_free()`), and a remote attacker can neither trigger nor time netns teardown. Hitting the window therefore depends on host-side container/netns churn outside the attacker\u0027s control.\\nPR:N - The ND transmit path is entered from unauthenticated received packets and from routing-driven neighbour probing; no credentials, account, or capability on the target host are needed to drive it.\\nUI:N - Neighbour solicitation, router probing and NA replies are automatic kernel behaviours triggered by packet arrival and timer/workqueue expiry; no victim action is involved.\\nS:U - The freed `struct net`, its `ndisc_sk`, MIB counters and netfilter hook arrays all live in the kernel\u0027s own security authority, so impact stays within the kernel \\u2014 no VM, IOMMU or sandbox boundary is crossed.\\nC:H - `sk` is loaded from the freed `net`, and `READ_ONCE(inet6_sk(sk)-\u003ehop_limit)` is copied into a transmitted ICMPv6 header, so a reclaimed-slab spray yields a read of attacker-chosen kernel memory exfiltrated onto the wire; more generally a UAF of `struct net` gives an arbitrary-read primitive.\\nI:H - `IP6_INC_STATS`/`ICMP6_INC_STATS` increment through a per-cpu pointer read from freed memory, and `NF_HOOK()` dispatches indirect calls through `net-\u003enf.hooks_ipv6[]` loaded from the freed object, giving both a write primitive and a plausible control-flow-hijack path.\\nA:H - Dereferencing a freed `struct net` and the garbage `ndisc_sk` pointer derived from it reliably produces an oops or panic, and the corrupted netfilter hook walk can take the whole kernel down.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1762f7e88eb34f653b4a915be99a102e347dd45e\", \"lessThan\": \"10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1762f7e88eb34f653b4a915be99a102e347dd45e\", \"lessThan\": \"4d576202b90b1b95a7c428a80b536f91b8201bcc\", 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\"https://git.kernel.org/stable/c/789230e5a8c1097301afc802e242c79bc8835c67\"}, {\"url\": \"https://git.kernel.org/stable/c/04e05112f10354ffc3bb6cc796d553bab161594c\"}, {\"url\": \"https://git.kernel.org/stable/c/ed6ae1f325d3c43966ec1b62ac1459e2b8e45640\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nndisc: extend RCU protection in ndisc_send_skb()\\n\\nndisc_send_skb() can be called without RTNL or RCU held.\\n\\nAcquire rcu_read_lock() earlier, so that we can use dev_net_rcu()\\nand avoid a potential UAF.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.291\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.235\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.129\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.79\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.16\", \"versionStartIncluding\": \"2.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.4\", \"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\": \"2026-08-05T11:54:13.122Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21760\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:40:31.196Z\", \"dateReserved\": \"2024-12-29T08:45:45.761Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-27T02:18:13.496Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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.


Related by attack behaviour

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.