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EUVD-2026-364458

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:32

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:32:30.163980+00:00",
  "id": "EUVD-2026-364458"
}

CVE-2024-50164 (GCVE-0-2024-50164)

Vulnerability from cvelistv5 – Published: 2024-11-07 09:31 – Updated: 2026-09-08 08:39

Title

bpf: Fix overloading of MEM_UNINIT's meaning

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix overloading of MEM_UNINIT's meaning Lonial reported an issue in the BPF verifier where check_mem_size_reg() has the following code: if (!tnum_is_const(reg->var_off)) /* For unprivileged variable accesses, disable raw * mode so that the program is required to * initialize all the memory that the helper could * just partially fill up. */ meta = NULL; This means that writes are not checked when the register containing the size of the passed buffer has not a fixed size. Through this bug, a BPF program can write to a map which is marked as read-only, for example, .rodata global maps. The problem is that MEM_UNINIT's initial meaning that "the passed buffer to the BPF helper does not need to be initialized" which was added back in commit 435faee1aae9 ("bpf, verifier: add ARG_PTR_TO_RAW_STACK type") got overloaded over time with "the passed buffer is being written to". The problem however is that checks such as the above which were added later via 06c1c049721a ("bpf: allow helpers access to variable memory") set meta to NULL in order force the user to always initialize the passed buffer to the helper. Due to the current double meaning of MEM_UNINIT, this bypasses verifier write checks to the memory (not boundary checks though) and only assumes the latter memory is read instead. Fix this by reverting MEM_UNINIT back to its original meaning, and having MEM_WRITE as an annotation to BPF helpers in order to then trigger the BPF verifier checks for writing to memory. Some notes: check_arg_pair_ok() ensures that for ARG_CONST_SIZE{,_OR_ZERO} we can access fn->arg_type[arg - 1] since it must contain a preceding ARG_PTR_TO_MEM. For check_mem_reg() the meta argument can be removed altogether since we do check both BPF_READ and BPF_WRITE. Same for the equivalent check_kfunc_mem_size_reg().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/43f4df339a4d375be…
https://git.kernel.org/stable/c/48068ccaea957469f…
https://git.kernel.org/stable/c/54bc31682660810af…
https://git.kernel.org/stable/c/8ea607330a39184f5…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version
Linux	Linux	Affected: 97e6d7dab1ca4648821c790a2b7913d6d5d549db , < 43f4df339a4d375bedcad29a61ae6f0ee7a048f8 (git) Affected: 97e6d7dab1ca4648821c790a2b7913d6d5d549db , < 48068ccaea957469f1adf78dfd2c1c9a7e18f0fe (git) Affected: 97e6d7dab1ca4648821c790a2b7913d6d5d549db , < 54bc31682660810af1bed7ca7a19f182df8d3df8 (git) Affected: 97e6d7dab1ca4648821c790a2b7913d6d5d549db , < 8ea607330a39184f51737c6ae706db7fdca7628e (git) Affected: 6099a6c8a749a5c8d5f8b4c4342022a92072a02b (git) Affected: bfe25df63048edd4ceaf78a2fc755d5e2befc978 (git) Affected: 717c39718dbc4f7ebcbb7b625fb11851cd9007fe (git) Affected: 5d0bba8232bf22ce13747cbfc8f696318ff01a50 (git) Affected: 70674d11d14eeecad90be4b409a22b902112ba32 (git) Affected: a08d942ecbf46e23a192093f6983cb1d779f4fa8 (git) Affected: 5.15.45 , < 5.16 (semver) Affected: 5.17.13 , < 5.18 (semver) Affected: 5.18.2 , < 5.19 (semver)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.125 , ≤ 6.1.* (semver) Unaffected: 6.6.59 , ≤ 6.6.* (semver) Unaffected: 6.11.6 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)

Show details on NVD website

JSON

To clipboard

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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.

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.

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EUVD-2026-364458

CVE-2024-50164 (GCVE-0-2024-50164)

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