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Title
Linux kernel存在未明漏洞（CNVD-2024-28363）
Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。
Linux kernel存在安全漏洞，该漏洞源于net中的dst_negative_advice() 存在竞争问题。目前没有详细的漏洞细节提供。
Severity
中
Patch Name
Linux kernel存在未明漏洞（CNVD-2024-28363）的补丁
Patch Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。
Linux kernel存在安全漏洞，该漏洞源于net中的dst_negative_advice() 存在竞争问题。目前没有详细的漏洞细节提供。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description
厂商已发布了漏洞修复程序，请及时关注更新： https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e
Reference
https://cxsecurity.com/cveshow/CVE-2024-36971/
Impacted products
| Name | Linux Linux kernel |
|---|
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"isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
"number": "CNVD-2024-28363",
"openTime": "2024-06-20",
"patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8enet\u4e2d\u7684dst_negative_advice() \u5b58\u5728\u7ade\u4e89\u95ee\u9898\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
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"products": {
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},
"referenceLink": "https://cxsecurity.com/cveshow/CVE-2024-36971/",
"serverity": "\u4e2d",
"submitTime": "2024-06-12",
"title": "Linux kernel\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2024-28363\uff09"
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CVE-2024-36971 (GCVE-0-2024-36971)
Vulnerability from cvelistv5 – Published: 2024-06-10 09:03 – Updated: 2026-08-05 11:32
VLAI
EPSS
VEX
Title
net: fix __dst_negative_advice() race
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: fix __dst_negative_advice() race
__dst_negative_advice() does not enforce proper RCU rules when
sk->dst_cache must be cleared, leading to possible UAF.
RCU rules are that we must first clear sk->sk_dst_cache,
then call dst_release(old_dst).
Note that sk_dst_reset(sk) is implementing this protocol correctly,
while __dst_negative_advice() uses the wrong order.
Given that ip6_negative_advice() has special logic
against RTF_CACHE, this means each of the three ->negative_advice()
existing methods must perform the sk_dst_reset() themselves.
Note the check against NULL dst is centralized in
__dst_negative_advice(), there is no need to duplicate
it in various callbacks.
Many thanks to Clement Lecigne for tracking this issue.
This old bug became visible after the blamed commit, using UDP sockets.
Severity
7.8 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-08 03:55 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
10 references
Impacted products
13 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13
(git)
Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < db0082825037794c5dba9959c9de13ca34cc5e72 (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < 2295a7ef5c8c49241bff769e7826ef2582e532a6 (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < eacb8b195579c174a6d3e12a9690b206eb7f28cf (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < 81dd3c82a456b0015461754be7cb2693991421b4 (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < 5af198c387128a9d2ddd620b0f0803564a4d4508 (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < b8af8e6118a6605f0e495a58d591ca94a85a50fc (git) Affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 , < 92f1655aa2b2294d0b49925f3b875a634bd3b59e (git) |
|
| Linux | Linux |
Affected:
4.6
Unaffected: 0 , < 4.6 (semver) Unaffected: 4.19.316 , ≤ 4.19.* (semver) Unaffected: 5.4.278 , ≤ 5.4.* (semver) Unaffected: 5.10.219 , ≤ 5.10.* (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.94 , ≤ 6.1.* (semver) Unaffected: 6.6.34 , ≤ 6.6.* (semver) Unaffected: 6.9.4 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
|
| linux | linux_kernel |
Affected:
4.6
cpe:2.3:o:linux:linux_kernel:4.6:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Affected:
a87cb3e48ee8 , < 051c0bde9f04
(git)
Affected: a87cb3e48ee8 , < db0082825037 (git) Affected: a87cb3e48ee8 , < 2295a7ef5c8c (git) Affected: a87cb3e48ee8 , < eacb8b195579 (git) Affected: a87cb3e48ee8 , < 81dd3c82a456 (git) Affected: a87cb3e48ee8 , < 5af198c38712 (git) Affected: a87cb3e48ee8 , < b8af8e6118a6 (git) Affected: a87cb3e48ee8 , < 92f1655aa2b2 (git) cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
0 , < 4.6
(custom)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
4.19.316 , < 4.20
(custom)
cpe:2.3:o:linux:linux_kernel:4.19.316:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
5.4.278 , < 5.5
(custom)
cpe:2.3:o:linux:linux_kernel:5.4.278:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
5.10.219 , < 5.11
(custom)
cpe:2.3:o:linux:linux_kernel:5.10.219:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
5.15.161 , < 5.16
(custom)
cpe:2.3:o:linux:linux_kernel:5.15.161:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
6.1.94 , < 6.2
(custom)
cpe:2.3:o:linux:linux_kernel:6.1.94:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
6.6.34 , < 6.7
(custom)
cpe:2.3:o:linux:linux_kernel:6.6.34:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
6.9.4 , < 6.10
(custom)
cpe:2.3:o:linux:linux_kernel:6.9.4:*:*:*:*:*:*:* |
|
| linux | linux_kernel |
Unaffected:
6.10 , ≤ *
(custom)
cpe:2.3:o:linux:linux_kernel:6.10:*:*:*:*:*:*:* |
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"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
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"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-08-08T03:55:25.565547Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2024-08-07",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T22:56:22.761Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971"
}
],
"timeline": [
{
"lang": "en",
"time": "2024-08-07T00:00:00.000Z",
"value": "CVE-2024-36971 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
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},
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix __dst_negative_advice() race\n\n__dst_negative_advice() does not enforce proper RCU rules when\nsk-\u003edst_cache must be cleared, leading to possible UAF.\n\nRCU rules are that we must first clear sk-\u003esk_dst_cache,\nthen call dst_release(old_dst).\n\nNote that sk_dst_reset(sk) is implementing this protocol correctly,\nwhile __dst_negative_advice() uses the wrong order.\n\nGiven that ip6_negative_advice() has special logic\nagainst RTF_CACHE, this means each of the three -\u003enegative_advice()\nexisting methods must perform the sk_dst_reset() themselves.\n\nNote the check against NULL dst is centralized in\n__dst_negative_advice(), there is no need to duplicate\nit in various callbacks.\n\nMany thanks to Clement Lecigne for tracking this issue.\n\nThis old bug became visible after the blamed commit, using UDP sockets."
}
],
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},
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"value": "AV:L - The race must be driven by two concurrent local socket operations on the same fd \u2014 `setsockopt(SO_CNX_ADVICE)` and a lockless `udp_sendmsg()` \u2014 so the attacker needs local syscall access. A remote peer can drive only the free side (TCP retransmit timeouts, ICMP-induced PMTU/redirect exceptions), not the racing `sk_dst_cache` writer.\nAC:L - The attacker controls both sides of the race (one thread calling `SO_CNX_ADVICE`, another calling `sendmsg()` on the same connected socket) and can create the required route-exception/obsolete-dst precondition at will, retrying indefinitely across many sockets; in-the-wild exploitation confirms it is reliably winnable.\nPR:L - `SO_CNX_ADVICE` in `sock_setsockopt()` carries no capability check and a connected UDP socket needs no privileges, so any unprivileged local user \u2014 including a sandboxed Android app, as in the observed real-world exploit \u2014 can reach the code.\nUI:N - Exploitation is entirely self-driven through the attacker\u0027s own socket, timers and threads; no victim action is needed.\nS:U - The corrupted `dst_entry` and the resulting code execution are both within the kernel\u0027s own security authority \u2014 standard local privilege escalation, no VM/IOMMU boundary crossed.\nC:H - The refcount underflow yields a use-after-free on a `dst_entry` whose contents (ops table, metrics, neighbour and function pointers) can be replaced by attacker-sprayed data, giving a kernel read primitive and full disclosure once escalated to root.\nI:H - `dst_entry` holds `ops`, `input()` and `output()` function pointers invoked on every transmit, so reclaiming the freed object gives direct control-flow hijack and arbitrary kernel write \u2014 this was weaponized as an in-the-wild Android privilege escalation.\nA:H - Even unweaponized, the premature free and dangling `sk_dst_cache` dereference cause refcount WARNs, memory corruption and kernel oops/panic, and the trigger can be repeated freely by an unprivileged process."
}
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"shortName": "Linux"
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{
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},
{
"url": "https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e"
}
],
"title": "net: fix __dst_negative_advice() race",
"x_generator": {
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}
}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-36971",
"datePublished": "2024-06-10T09:03:23.878Z",
"dateReserved": "2024-05-30T15:25:07.082Z",
"dateUpdated": "2026-08-05T11:32:22.196Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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.
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