CVE-2023-53338 (GCVE-0-2023-53338)
Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2026-08-05 09:13
VLAI
EPSS
VEX
Title
lwt: Fix return values of BPF xmit ops
Summary
In the Linux kernel, the following vulnerability has been resolved:
lwt: Fix return values of BPF xmit ops
BPF encap ops can return different types of positive values, such like
NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function
skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return
values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in
ip(6)_finish_output2. When this happens, skbs that have been freed would
continue to the neighbor subsystem, causing use-after-free bug and
kernel crashes.
To fix the incorrect behavior, skb_do_redirect return values can be
simply discarded, the same as tc-egress behavior. On the other hand,
bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU
information. Thus convert its return values to avoid the conflict with
LWTUNNEL_XMIT_CONTINUE.
Severity
9.8 (Critical)
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:38 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 67f8f2bae8e7ac72e09def2b667e44704c4d1ee1
(git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < a97f221651fcdc891166e9bc270e3d9bfa5a0080 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < e3f647e4b642f9f6d32795a16f92c116c138d2af (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 065d5f17096ec9161180e2c890afdff4dc6125f2 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < d68c17402442f5f494a2c3ebde5cb82f6aa9160a (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 65583f9e070db7bece20710cfa2e3daeb0b831d9 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 29b22badb7a84b783e3a4fffca16f7768fb31205 (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 5.4.257 , ≤ 5.4.* (semver) Unaffected: 5.10.195 , ≤ 5.10.* (semver) Unaffected: 5.15.132 , ≤ 5.15.* (semver) Unaffected: 6.1.53 , ≤ 6.1.* (semver) Unaffected: 6.4.16 , ≤ 6.4.* (semver) Unaffected: 6.5.3 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix) |
guessed |
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"type": "Secondary"
}
],
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{
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},
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{
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],
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"product_status:fixed": "279",
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"status": "final",
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"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53338.json",
"version": "3"
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"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53338.json",
"version": "51"
},
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"metrics": [
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},
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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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