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CVE-2025-68726 (GCVE-0-2025-68726)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:33 – Updated: 2026-08-05 12:11

Title

crypto: aead - Fix reqsize handling

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: aead - Fix reqsize handling Commit afddce13ce81d ("crypto: api - Add reqsize to crypto_alg") introduced cra_reqsize field in crypto_alg struct to replace type specific reqsize fields. It looks like this was introduced specifically for ahash and acomp from the commit description as subsequent commits add necessary changes in these alg frameworks. However, this is being recommended for use in all crypto algs instead of setting reqsize using crypto_*_set_reqsize(). Using cra_reqsize in aead algorithms, hence, causes memory corruptions and crashes as the underlying functions in the algorithm framework have not been updated to set the reqsize properly from cra_reqsize. [1] Add proper set_reqsize calls in the aead init function to properly initialize reqsize for these algorithms in the framework. [1]: https://gist.github.com/Pratham-T/24247446f1faf4b7843e4014d5089f6b

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/64377e66e187164bd…
https://git.kernel.org/stable/c/12b413f5460c393d1…
https://git.kernel.org/stable/c/9b04d8f0056957379…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: afddce13ce81d52a13898fa0700917835c71acd6 , < 64377e66e187164bd6737112d07257f5f0feb681 (git) Affected: afddce13ce81d52a13898fa0700917835c71acd6 , < 12b413f5460c393d1151a37f591140693eca0f84 (git) Affected: afddce13ce81d52a13898fa0700917835c71acd6 , < 9b04d8f00569573796dd05397f5779135593eb24 (git)	guessed
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.17.13 , ≤ 6.17.* (semver) Unaffected: 6.18.2 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)	guessed

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          "programFiles": [
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              "value": "AV:N - A remote peer can cause a kTLS-enabled server using an affected AEAD implementation to decrypt received TLS records, reaching the vulnerable crypto path through normal TCP processing.\nAC:L - Every request is underallocated and the implementation immediately overwrites caller-owned state; no race or condition outside the attacker\u0027s control is required.\nPR:N - A remote peer can establish an ordinary TLS session and submit records without kernel capabilities, local credentials, or an authenticated application session.\nUI:N - The server processes the attacker\u0027s TLS records without requiring any victim action.\nS:U - Exploitation compromises the host kernel but does not inherently cross a separate virtualization, IOMMU, or other security authority.\nC:H - The overwrite corrupts kernel pointers and scatterlist state, providing memory-corruption primitives capable of redirecting reads and exposing arbitrary kernel memory.\nI:H - The undersized context overwrites pointer-bearing adjacent structures, making arbitrary writes, control-flow hijacking, and kernel code execution defensible outcomes.\nA:H - Corruption of socket, completion, and scatterlist state can cause a kernel oops or panic, and an attacker can trigger it repeatedly."
            }
          ]
        }
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    "cveId": "CVE-2025-68726",
    "datePublished": "2025-12-24T10:33:10.364Z",
    "dateReserved": "2025-12-24T10:30:51.027Z",
    "dateUpdated": "2026-08-05T12:11:09.299Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Arbitrary code execution and denial of service in crypto:aead",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68726.json",
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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.

Detection rules are retrieved from Rulezet.

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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CVE-2025-68726 (GCVE-0-2025-68726)

WID-SEC-W-2025-2920

Tags

Sightings

Nomenclature

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