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

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-01-26 06:52
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 ?
No CVSS data available.
Assigner
References
Impacted 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)
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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-rc5 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "net/ceph/osdmap.c"
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-26T06:52:38.639Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-01-23T15:24:12.191Z",
    "dateReserved": "2026-01-13T15:37:45.937Z",
    "dateUpdated": "2026-01-26T06:52:38.639Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-22991\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-23T16:15:55.183\",\"lastModified\":\"2026-01-26T15:03:33.357\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8081faaf089db5280c3be820948469f7c58ef8dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b3730dabcf3764bfe3ff07caf55e641a0b45234\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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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