Vulnerability-Lookup

GHSA-953J-P37P-R755

Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-02-26 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

libceph: make free_choose_arg_map() resilient to partial allocation

free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation.

For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer.

To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22991"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-23T16:15:55Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: make free_choose_arg_map() resilient to partial allocation\n\nfree_choose_arg_map() may dereference a NULL pointer if its caller fails\nafter a partial allocation.\n\nFor example, in decode_choose_args(), if allocation of arg_map-\u003eargs\nfails, execution jumps to the fail label and free_choose_arg_map() is\ncalled. Since arg_map-\u003esize is updated to a non-zero value before memory\nallocation, free_choose_arg_map() will iterate over arg_map-\u003eargs and\ndereference a NULL pointer.\n\nTo prevent this potential NULL pointer dereference and make\nfree_choose_arg_map() more resilient, add checks for pointers before\niterating.",
  "id": "GHSA-953j-p37p-r755",
  "modified": "2026-02-26T21:31:27Z",
  "published": "2026-01-23T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22991"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8081faaf089db5280c3be820948469f7c58ef8dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b3730dabcf3764bfe3ff07caf55e641a0b45234"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-22991 (GCVE-0-2026-22991)

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-08-05 12:19

Title

libceph: make free_choose_arg_map() resilient to partial allocation

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation. For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer. To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-16 20:35 UTC

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/9b3730dabcf3764bf…
https://git.kernel.org/stable/c/851241d3f78a55052…
https://git.kernel.org/stable/c/ec1850f663da64842…
https://git.kernel.org/stable/c/8081faaf089db5280…
https://git.kernel.org/stable/c/c4c2152a858c0ce4d…
https://git.kernel.org/stable/c/f21c3fdb96833aac2…
https://git.kernel.org/stable/c/e3fe30e57649c5517…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 9b3730dabcf3764bfe3ff07caf55e641a0b45234 (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 851241d3f78a5505224dc21c03d8692f530256b4 (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < ec1850f663da64842614c86b20fe734be070c2ba (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 8081faaf089db5280c3be820948469f7c58ef8dd (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < f21c3fdb96833aac2f533506899fe38c19cf49d5 (git) Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < e3fe30e57649c551757a02e1cad073c47e1e075e (git)
Linux	Linux	Affected: 4.13 Unaffected: 0 , < 4.13 (semver) Unaffected: 5.10.248 , ≤ 5.10.* (semver) Unaffected: 5.15.198 , ≤ 5.15.* (semver) Unaffected: 6.1.161 , ≤ 6.1.* (semver) Unaffected: 6.6.121 , ≤ 6.6.* (semver) Unaffected: 6.12.66 , ≤ 6.12.* (semver) Unaffected: 6.18.6 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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                "id": "CVE-2026-22991",
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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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