CVE-2025-21760 (GCVE-0-2025-21760)
Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-09-08 08:40
VLAI
EPSS
VEX
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)
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 17:57 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
12 references
Impacted products
6 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 | |
| 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 | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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{
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"x_adpType": "supplier"
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}
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}
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}
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"title": "ndisc: extend RCU protection in ndisc_send_skb()",
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"dateReserved": "2024-12-29T08:45:45.761Z",
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"title": "ndisc: extend RCU protection in ndisc_send_skb()",
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"value": "AV:N - `ndisc_send_skb()` sits on the IPv6 neighbour-discovery transmit path, which is driven by ordinary received network traffic \u2014 a remote packet that requires a next-hop resolve causes `neigh_probe()`\u2192`ndisc_solicit()`\u2192`ndisc_send_ns()`\u2192`ndisc_send_skb( )`, and inbound NS/RS/forwarded packets also reach it via `ndisc_send_na()`/`ndisc_send_redirect()`. 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:54:13.122Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1"
},
{
"url": "https://git.kernel.org/stable/c/4d576202b90b1b95a7c428a80b536f91b8201bcc"
},
{
"url": "https://git.kernel.org/stable/c/e24d225e4cb8cf108bde00b76594499b98f0a74d"
},
{
"url": "https://git.kernel.org/stable/c/a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d"
},
{
"url": "https://git.kernel.org/stable/c/ae38982f521621c216fc2f5182cd091f4734641d"
},
{
"url": "https://git.kernel.org/stable/c/789230e5a8c1097301afc802e242c79bc8835c67"
},
{
"url": "https://git.kernel.org/stable/c/04e05112f10354ffc3bb6cc796d553bab161594c"
},
{
"url": "https://git.kernel.org/stable/c/ed6ae1f325d3c43966ec1b62ac1459e2b8e45640"
}
],
"title": "ndisc: extend RCU protection in ndisc_send_skb()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-21760",
"datePublished": "2025-02-27T02:18:13.496Z",
"dateReserved": "2024-12-29T08:45:45.761Z",
"dateUpdated": "2026-09-08T08:40:31.196Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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