CVE-2024-36929 (GCVE-0-2024-36929)
Vulnerability from cvelistv5 – Published: 2024-05-30 15:29 – Updated: 2026-08-05 11:32
VLAI
EPSS
VEX
Title
net: core: reject skb_copy(_expand) for fraglist GSO skbs
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: core: reject skb_copy(_expand) for fraglist GSO skbs
SKB_GSO_FRAGLIST skbs must not be linearized, otherwise they become
invalid. Return NULL if such an skb is passed to skb_copy or
skb_copy_expand, in order to prevent a crash on a potential later
call to skb_gso_segment.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-04 15:42 UTC
Assigner
References
10 references
Impacted products
6 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < faa83a7797f06cefed86731ba4baa3b4dfdc06c1
(git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < c7af99cc21923a9650533c9d77265c8dd683a533 (git) Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < 989bf6fd1e1d058e73a364dce1a0c53d33373f62 (git) Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < cfe34d86ef9765c388f145039006bb79b6c81ac6 (git) Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < aea5e2669c2863fdd8679c40ee310b3bcaa85aec (git) Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < d091e579b864fa790dd6a0cd537a22c383126681 (git) |
guessed | |
| Linux | Linux |
Affected:
5.6
Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.217 , ≤ 5.10.* (semver) Unaffected: 5.15.159 , ≤ 5.15.* (semver) Unaffected: 6.1.91 , ≤ 6.1.* (semver) Unaffected: 6.6.31 , ≤ 6.6.* (semver) Unaffected: 6.8.10 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"value": "AV:N - The invalid skb is manufactured entirely from received UDP traffic \u2014 fraglist GRO aggregates remotely-sourced datagrams, and `udp_gro_receive` marks any UDP packet lacking a local socket as fraglist-eligible, so forwarded flows from arbitrary internet sources qualify. Bridge/overlay ports (VXLAN, GRE, L2TP) carrying such traffic mean the attacker need not sit on the victim\u0027s L2 segment.\nAC:L - The attacker fully controls both preconditions for GRO coalescing \u2014 sending back-to-back same-flow UDP datagrams is sufficient to build the fraglist skb, and the resulting `udp_hdr(seg-\u003enext)-\u003edest` dereference on a NULL `seg-\u003enext` is deterministic, not layout- or timing-dependent. No memory grooming or race win is needed.\nPR:N - The entire path \u2014 NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` \u2192 `skb_gso_segment` \u2014 runs in softirq on unauthenticated received packets. The attacker needs no account, credentials, or capability on the target.\nUI:N - Triggering requires only that the victim host receive and forward the attacker\u0027s UDP packets, which happens automatically in the receive/transmit softirq. No administrator or user action is involved.\nS:U - The fault occurs in the kernel\u0027s own network stack and its impact is confined to that kernel\u0027s security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The failure is a NULL pointer dereference at a small fixed offset (`udp_hdr(NULL)-\u003edest`), which faults immediately below `mmap_min_addr` rather than reading valid memory. No out-of-bounds read, uninitialized data, or kernel pointer is exposed to the attacker.\nI:N - Nothing is written outside the skb before the oops \u2014 only the packet\u0027s own UDP length field is updated in `__udp_gso_segment_list()`. There is no out-of-bounds write, use-after-free, or type confusion, so no control-flow-hijack or arbitrary-write primitive arises.\nA:H - The NULL dereference happens in softirq context on the transmit path, producing a kernel oops that on a forwarding device typically panics the machine (and is fatal with `panic_on_oops`). An unauthenticated attacker can repeat it at will with a UDP burst, causing complete loss of availability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:32:08.251Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/faa83a7797f06cefed86731ba4baa3b4dfdc06c1"
},
{
"url": "https://git.kernel.org/stable/c/c7af99cc21923a9650533c9d77265c8dd683a533"
},
{
"url": "https://git.kernel.org/stable/c/989bf6fd1e1d058e73a364dce1a0c53d33373f62"
},
{
"url": "https://git.kernel.org/stable/c/cfe34d86ef9765c388f145039006bb79b6c81ac6"
},
{
"url": "https://git.kernel.org/stable/c/aea5e2669c2863fdd8679c40ee310b3bcaa85aec"
},
{
"url": "https://git.kernel.org/stable/c/d091e579b864fa790dd6a0cd537a22c383126681"
}
],
"title": "net: core: reject skb_copy(_expand) for fraglist GSO skbs",
"x_generator": {
"engine": "bippy-1.2.0"
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-36929",
"datePublished": "2024-05-30T15:29:21.430Z",
"dateReserved": "2024-05-30T15:25:07.069Z",
"dateUpdated": "2026-08-05T11:32:08.251Z",
"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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