{"id":"CVE-2026-22991","title":"libceph: make free_choose_arg_map() resilient to partial allocation","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 9b3730dabcf3764bfe3ff07caf55e641a0b45234","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 851241d3f78a5505224dc21c03d8692f530256b4","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < ec1850f663da64842614c86b20fe734be070c2ba","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 8081faaf089db5280c3be820948469f7c58ef8dd","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < f21c3fdb96833aac2f533506899fe38c19cf49d5","Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < e3fe30e57649c551757a02e1cad073c47e1e075e","Linux 4.13"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-16T20:35:31.087945Z"},"published":"2026-01-23","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:25:26.442Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-22991","references":[{"url":"https://git.kernel.org/stable/c/9b3730dabcf3764bfe3ff07caf55e641a0b45234"},{"url":"https://git.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4"},{"url":"https://git.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2ba"},{"url":"https://git.kernel.org/stable/c/8081faaf089db5280c3be820948469f7c58ef8dd"},{"url":"https://git.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf"},{"url":"https://git.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5"},{"url":"https://git.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075e"}],"tags":["cve.org"],"epss":0.00433,"epssPercentile":0.36265,"ingestedAt":"2026-10-19T18:35:50.112Z","slug":"CVE-2026-22991","body":"## Overview\n\nIn 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->args\nfails, execution jumps to the fail label and free_choose_arg_map() is\ncalled. Since arg_map->size is updated to a non-zero value before memory\nallocation, free_choose_arg_map() will iterate over arg_map->args 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.\n\n## Affected\n\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 9b3730dabcf3764bfe3ff07caf55e641a0b45234`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 851241d3f78a5505224dc21c03d8692f530256b4`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < ec1850f663da64842614c86b20fe734be070c2ba`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < 8081faaf089db5280c3be820948469f7c58ef8dd`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < f21c3fdb96833aac2f533506899fe38c19cf49d5`\n- `Linux >= 5cf9c4a9959b6273675310d14a834ef14fbca37c < e3fe30e57649c551757a02e1cad073c47e1e075e`\n- `Linux 4.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}