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

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-08-05 12:19
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nlibceph: hacer free_choose_arg_map() resistente a la asignaci\u00f3n parcial\\n\\nfree_choose_arg_map() puede desreferenciar un puntero NULL si su llamador falla despu\u00e9s de una asignaci\u00f3n parcial.\\n\\nPor ejemplo, en decode_choose_args(), si la asignaci\u00f3n de arg_map-\u0026gt;args falla, la ejecuci\u00f3n salta a la etiqueta fail y se llama a free_choose_arg_map(). Dado que arg_map-\u0026gt;size se actualiza a un valor distinto de cero antes de la asignaci\u00f3n de memoria, free_choose_arg_map() iterar\u00e1 sobre arg_map-\u0026gt;args y desreferenciar\u00e1 un puntero NULL.\\n\\nPara evitar esta potencial desreferencia de puntero NULL y hacer free_choose_arg_map() m\u00e1s resistente, a\u00f1adir comprobaciones para los punteros antes de 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T13:41:20+00:00",
      "cve": "CVE-2026-22991",
      "id": "CVE-2026-22991",
      "initial_release_date": "2026-01-23T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: make free_choose_arg_map() resilient to partial allocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22991.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-24T02:41:29Z",
      "cve": "CVE-2026-22991",
      "id": "CVE-2026-22991",
      "initial_release_date": "2026-01-27T00:26:58Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "600",
      "product_status:known_not_affected": "18",
      "product_status:recommended": "344",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-22991",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-22991.json",
      "version": "30"
    },
    "vulnrichment": {
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.161\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.121\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.66\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.6\", \"versionStartIncluding\": \"4.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:57:53.477Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-22991\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T20:35:39.173Z\", \"dateReserved\": \"2026-01-13T15:37:45.937Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-23T15:24:12.191Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.