{"id":"CVE-2026-98854","title":"of/overlay: only treat a positive changeset id as registered","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nof/overlay: only treat a positive changeset id as registered\n\nof_overlay_fdt_apply() stores the idr_alloc() return value in\novcs->id before checking it. On failure the …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < c08a54df9d33dcd6ff089adc9434b2c008af3a39","Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < 0d1525fdcd3355672b7485d61e55df6824ab5ad1","Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < c875407c34dadaef0599834ad9c815f4c9f50d15","Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < 44081d708b5b885487bac792db78324b7b4c267d","Linux 4.15"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:51:06.167Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98854","references":[{"url":"https://git.kernel.org/stable/c/c08a54df9d33dcd6ff089adc9434b2c008af3a39"},{"url":"https://git.kernel.org/stable/c/0d1525fdcd3355672b7485d61e55df6824ab5ad1"},{"url":"https://git.kernel.org/stable/c/c875407c34dadaef0599834ad9c815f4c9f50d15"},{"url":"https://git.kernel.org/stable/c/44081d708b5b885487bac792db78324b7b4c267d"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.461Z","slug":"CVE-2026-98854","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nof/overlay: only treat a positive changeset id as registered\n\nof_overlay_fdt_apply() stores the idr_alloc() return value in\novcs->id before checking it. On failure the stored id is negative,\nfree_overlay_changeset()'s \"if (ovcs->id)\" check passes, idr_remove()\nis called with a negative id and list_del() runs on ovcs->ovcs_list,\nwhich is not initialized until after the id allocation. An allocation\nfailure at that point dereferences NULL.\n\nMake free_overlay_changeset() treat only a strict-positive id as\nregistered. The rest of the function already copes with a\npartially-initialized ovcs, so the error path stays a plain\ngoto err_free_ovcs.\n\n## Affected\n\n- `Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < c08a54df9d33dcd6ff089adc9434b2c008af3a39`\n- `Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < 0d1525fdcd3355672b7485d61e55df6824ab5ad1`\n- `Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < c875407c34dadaef0599834ad9c815f4c9f50d15`\n- `Linux >= 61b4de4e0b384f4a22c55c3bada604da49cec4e1 < 44081d708b5b885487bac792db78324b7b4c267d`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}