CVE-2024-26809 (GCVE-0-2024-26809)
Vulnerability from cvelistv5 – Published: 2024-04-04 09:51 – Updated: 2026-08-05 11:27
VLAI
EPSS
VEX
Title
netfilter: nft_set_pipapo: release elements in clone only from destroy path
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_pipapo: release elements in clone only from destroy path
Clone already always provides a current view of the lookup table, use it
to destroy the set, otherwise it is possible to destroy elements twice.
This fix requires:
212ed75dc5fb ("netfilter: nf_tables: integrate pipapo into commit protocol")
which came after:
9827a0e6e23b ("netfilter: nft_set_pipapo: release elements in clone from abort path").
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:50 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4a6430b99f67842617c7208ca55a411e903ba03a , < b36b83297ff4910dfc8705402c8abffd4bbf8144
(git)
Affected: 5ccecafc728b0df48263d5ac198220bcd79830bc , < 362508506bf545e9ce18c72a2c48dcbfb891ab9c (git) Affected: 9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e , < 5ad233dc731ab64cdc47b84a5c1f78fff6c024af (git) Affected: 9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e , < ff90050771412b91e928093ccd8736ae680063c2 (git) Affected: 9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e , < 821e28d5b506e6a73ccc367ff792bd894050d48b (git) Affected: 9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e , < 9384b4d85c46ce839f51af01374062ce6318b2f2 (git) Affected: 9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e , < b0e256f3dd2ba6532f37c5c22e07cb07a36031ee (git) Affected: d2b18d110685ce46ca1633b8ec586c685e243a51 (git) Affected: 5.10.130 , < 5.10.214 (semver) Affected: 5.15.54 , < 5.15.153 (semver) Affected: 5.18.11 , < 5.19 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.19
Unaffected: 0 , < 5.19 (semver) Unaffected: 5.10.214 , ≤ 5.10.* (semver) Unaffected: 5.15.153 , ≤ 5.15.* (semver) Unaffected: 6.1.83 , ≤ 6.1.* (semver) Unaffected: 6.6.23 , ≤ 6.6.* (semver) Unaffected: 6.7.11 , ≤ 6.7.* (semver) Unaffected: 6.8.2 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:L - The vulnerability is reached exclusively through the nfnetlink/nftables netlink socket (NFNL_SUBSYS_NFTABLES batch transactions), which requires local system access. There is no network-facing path into the pipapo set destroy code.\nAC:L - The double free is fully deterministic \u2014 a single netlink batch that modifies elements of a pipapo set and deletes that set in the same transaction leaves priv-\u003edirty set (nft_set_commit_update skips dead sets), guaranteeing elements are destroyed from both priv-\u003ematch and priv-\u003eclone. No race, no memory-layout precondition beyond ordinary attacker-controlled heap grooming.\nPR:L - nfnetlink_rcv_batch() checks netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the socket\u0027s network-namespace user namespace, so an unprivileged local user obtains it via unshare -Urn and can create tables, pipapo sets and elements freely. pipapo is compiled unconditionally into nf_tables and is the default backend for concatenated-range sets.\nUI:N - The attacker triggers the entire sequence themselves with one nftables transaction batch from their own process. No victim action or interaction of any kind is needed.\nS:U - The corruption occurs in kernel slab memory and is exploited to gain kernel privileges within the same security authority. No hypervisor, IOMMU, or other security-boundary crossing is involved.\nC:H - The double free of the element allocation yields a dangling reference to a reallocated slab object, letting the attacker read back kernel data (including data reclaimed into the same kmalloc-cg cache) and ultimately obtain an arbitrary-read primitive.\nI:H - A controlled double free of an attacker-sized, attacker-content object is a strong exploitation primitive: reclaiming the freed chunk with a second live allocation gives type confusion and an arbitrary-write path, compounded by the duplicated nft_set_elem_expr_destroy() dropping set/object reference counts twice and causing refcount underflow.\nA:H - Even without full exploitation, freeing the same nft_pipapo_elem twice corrupts slab freelists and double-destroys element expressions, producing immediate kernel oops/panic (or KASAN double-free BUG). The attacker can trigger it repeatedly and at will."
}
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"providerMetadata": {
"dateUpdated": "2026-08-05T11:27:28.080Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/b36b83297ff4910dfc8705402c8abffd4bbf8144"
},
{
"url": "https://git.kernel.org/stable/c/362508506bf545e9ce18c72a2c48dcbfb891ab9c"
},
{
"url": "https://git.kernel.org/stable/c/5ad233dc731ab64cdc47b84a5c1f78fff6c024af"
},
{
"url": "https://git.kernel.org/stable/c/ff90050771412b91e928093ccd8736ae680063c2"
},
{
"url": "https://git.kernel.org/stable/c/821e28d5b506e6a73ccc367ff792bd894050d48b"
},
{
"url": "https://git.kernel.org/stable/c/9384b4d85c46ce839f51af01374062ce6318b2f2"
},
{
"url": "https://git.kernel.org/stable/c/b0e256f3dd2ba6532f37c5c22e07cb07a36031ee"
}
],
"title": "netfilter: nft_set_pipapo: release elements in clone only from destroy path",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-26809",
"datePublished": "2024-04-04T09:51:51.245Z",
"dateReserved": "2024-02-19T14:20:24.179Z",
"dateUpdated": "2026-08-05T11:27:28.080Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
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}
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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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