CVE-2024-56720 (GCVE-0-2024-56720)
Vulnerability from cvelistv5 – Published: 2024-12-29 11:29 – Updated: 2026-08-05 11:46
VLAI
EPSS
VEX
Title
bpf, sockmap: Several fixes to bpf_msg_pop_data
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Several fixes to bpf_msg_pop_data
Several fixes to bpf_msg_pop_data,
1. In sk_msg_shift_left, we should put_page
2. if (len == 0), return early is better
3. pop the entire sk_msg (last == msg->sg.size) should be supported
4. Fix for the value of variable "a"
5. In sk_msg_shift_left, after shifting, i has already pointed to the next
element. Addtional sk_msg_iter_var_next may result in BUG.
Severity
7.8 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:58 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < d3f5763b3062514a234114e97bbde74d8d702449
(git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < d26d977633d1d0b8bf9407278189bd0a8d973323 (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < e1f54c61c4c9a5244eb8159dce60d248f7d97b32 (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < f58d3aa457e77a3d9b3df2ab081dcf9950f6029f (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 98c7ea7d11f2588e8197db042e0291e4ac8f8346 (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 785180bed9879680d8e5c5e1b54c8ae8d948f4c8 (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 275a9f3ef8fabb0cb282a62b9e164dedba7284c5 (git) Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 5d609ba262475db450ba69b8e8a557bd768ac07a (git) |
guessed | |
| Linux | Linux |
Affected:
5.0
Unaffected: 0 , < 5.0 (semver) Unaffected: 5.4.287 , ≤ 5.4.* (semver) Unaffected: 5.10.231 , ≤ 5.10.* (semver) Unaffected: 5.15.174 , ≤ 5.15.* (semver) Unaffected: 6.1.120 , ≤ 6.1.* (semver) Unaffected: 6.6.64 , ≤ 6.6.* (semver) Unaffected: 6.11.11 , ≤ 6.11.* (semver) Unaffected: 6.12.2 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Several fixes to bpf_msg_pop_data\n\nSeveral fixes to bpf_msg_pop_data,\n1. In sk_msg_shift_left, we should put_page\n2. if (len == 0), return early is better\n3. pop the entire sk_msg (last == msg-\u003esg.size) should be supported\n4. Fix for the value of variable \"a\"\n5. In sk_msg_shift_left, after shifting, i has already pointed to the next\nelement. Addtional sk_msg_iter_var_next may result in BUG."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Varias correcciones para bpf_msg_pop_data Varias correcciones para bpf_msg_pop_data, 1. En sk_msg_shift_left, deber\u00edamos put_page 2. si (len == 0), es mejor regresar antes 3. Deber\u00eda ser compatible con la extracci\u00f3n de todo el sk_msg (last == msg-\u0026gt;sg.size) 4. Correcci\u00f3n para el valor de la variable \"a\" 5. En sk_msg_shift_left, despu\u00e9s de cambiar, i ya ha apuntado al siguiente elemento. La adici\u00f3n de sk_msg_iter_var_next puede provocar un ERROR."
}
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf, sockmap: Several fixes to bpf_msg_pop_data",
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}
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"value": "AV:L - The vulnerable helper runs from `sk_psock_msg_verdict()` on the local egress path, requiring a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap plus a local `sendmsg()` on a sockmap\u0027d socket; there is no remote packet path into `bpf_msg_pop_data()` since SK_MSG programs only process data the local host is sending.\nAC:L - The bug is fully deterministic and entirely attacker-controlled \u2014 the sender chooses the write size that splits the message across scatterlist elements (making `offset != 0`), and the BPF program chooses a `start` that lands in a later element, so `a = start` is guaranteed to exceed `sge-\u003elength` with no race, timing, or memory-layout dependency.\nPR:L - Setting up the sockmap and SK_MSG program requires CAP_BPF and CAP_NET_ADMIN, but `bpf_token_capable()` grants these at `ns_capable()` level inside a user namespace via delegated BPF tokens, and both capabilities are routinely handed to container workloads, so an ordinary unprivileged-in-init-ns user can reach this path.\nUI:N - No victim action is required \u2014 the attacker loads the SK_MSG program and issues the triggering `sendmsg()` entirely on their own, with no file to open, filesystem to mount, or third party to interact with.\nS:U - The out-of-bounds reads, heap overflow, and scatterlist-ring corruption are all confined to the kernel\u0027s own memory and the socket\u0027s psock state; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The corrupted scatterlist entry carries an inflated `length` (up to ~4 GB after the signed-to-unsigned wrap of `b`) and an `offset` past the page, and `tcp_bpf_push()` hands those verbatim to `tcp_sendmsg_locked()` with MSG_SPLICE_PAGES, transmitting arbitrary adjacent kernel heap memory to the socket peer; the `!space` path additionally performs `memcpy(to, from, a)` reading far past the source element.\nI:H - In the no-space branch `memcpy(to, from, a)` and `memcpy(to + a, from + a + pop, b)` write attacker-sized data past an undersized `alloc_pages()` allocation \u2014 a controlled heap buffer overflow \u2014 and the missing `put_page()` plus the stray `sk_msg_iter_var_next()` rotate the entire sg ring, installing stale `struct page *` values that produce refcount imbalance and use-after-free of pages.\nA:H - A negative `b` passed to `memcpy()` as `size_t`, a scatterlist entry pointing far outside its page, and `sk_msg_shift_left()` corrupting the whole fragment ring all lead directly to kernel oops/panic, while the missing `put_page()` permanently leaks a page per popped element."
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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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