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EUVD-2026-320431

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:40

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": "2026-10-02T07:40:31.790060+00:00",
  "id": "EUVD-2026-320431"
}

CVE-2023-52854 (GCVE-0-2023-52854)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:31 – Updated: 2026-05-23 15:27

Title

padata: Fix refcnt handling in padata_free_shell()

Summary

In the Linux kernel, the following vulnerability has been resolved: padata: Fix refcnt handling in padata_free_shell() In a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead to system UAF (Use-After-Free) issues. Due to the lengthy analysis of the pcrypt_aead01 function call, I'll describe the problem scenario using a simplified model: Suppose there's a user of padata named `user_function` that adheres to the padata requirement of calling `padata_free_shell` after `serial()` has been invoked, as demonstrated in the following code: ```c struct request { struct padata_priv padata; struct completion *done; }; void parallel(struct padata_priv *padata) { do_something(); } void serial(struct padata_priv *padata) { struct request *request = container_of(padata, struct request, padata); complete(request->done); } void user_function() { DECLARE_COMPLETION(done) padata->parallel = parallel; padata->serial = serial; padata_do_parallel(); wait_for_completion(&done); padata_free_shell(); } ``` In the corresponding padata.c file, there's the following code: ```c static void padata_serial_worker(struct work_struct *serial_work) { ... cnt = 0; while (!list_empty(&local_list)) { ... padata->serial(padata); cnt++; } local_bh_enable(); if (refcount_sub_and_test(cnt, &pd->refcnt)) padata_free_pd(pd); } ``` Because of the high system load and the accumulation of unexecuted softirq at this moment, `local_bh_enable()` in padata takes longer to execute than usual. Subsequently, when accessing `pd->refcnt`, `pd` has already been released by `padata_free_shell()`, resulting in a UAF issue with `pd->refcnt`. The fix is straightforward: add `refcount_dec_and_test` before calling `padata_free_pd` in `padata_free_shell`.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-22 18:22 UTC

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/41aad9d6953984d13…
https://git.kernel.org/stable/c/0dd34a7ad395dbcf6…
https://git.kernel.org/stable/c/c7c26d0ef5d20f00d…
https://git.kernel.org/stable/c/1e901bcb8af19416b…
https://git.kernel.org/stable/c/1734a79e951914f1d…
https://git.kernel.org/stable/c/7ddc21e317b360c34…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 41aad9d6953984d134fc50f631f24ef476875d4d (git) Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5 (git) Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275 (git) Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 1e901bcb8af19416b65f5063a4af7996e5a51d7f (git) Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 1734a79e951914f1db2c65e635012a35db1c674b (git) Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 7ddc21e317b360c3444de3023bcc83b85fabae2f (git) Affected: 13721e447acc2b82c19cf72e9e6c4291c77693ed (git) Affected: 7a2ccb65f90168edc2348495bb56093c466ffa39 (git) Affected: 928cf3d733c4efc221e1a78b14cb2ee066627260 (git) Affected: c9da8ee1491719001a444f4af688b75e72b58418 (git) Affected: dc34710a7aba5207e7cb99d11588c04535b3c53d (git) Affected: 5fefc9b3e3584a1ce98da27c38e1b8dda1939d74 (git) Affected: 26daf8e6515c2dcd25d235468420b9f46e0acdac (git) Affected: 3.16.84 , < 3.17 (semver) Affected: 4.4.215 , < 4.5 (semver) Affected: 4.9.215 , < 4.10 (semver) Affected: 4.14.172 , < 4.15 (semver) Affected: 4.19.103 , < 4.20 (semver) Affected: 5.4.19 , < 5.5 (semver) Affected: 5.5.3 , < 5.6 (semver)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.201 , ≤ 5.10.* (semver) Unaffected: 5.15.139 , ≤ 5.15.* (semver) Unaffected: 6.1.63 , ≤ 6.1.* (semver) Unaffected: 6.5.12 , ≤ 6.5.* (semver) Unaffected: 6.6.2 , ≤ 6.6.* (semver) Unaffected: 6.7 , ≤ * (original_commit_for_fix)

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.
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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.
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EUVD-2026-320431

CVE-2023-52854 (GCVE-0-2023-52854)

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