{"id":"CVE-2026-46215","summary":"drm: Set old handle to NULL before prime swap in change_handle","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Set old handle to NULL before prime swap in change_handle\n\nThere was a potential race condition in change_handle. The ioctl\nbriefly had a single object with two idr entries; a concurrent\ngem_close could delete the object and remove one of the handles\nwhile leaving the other one dangling, which could subsequently\nbe dereferenced for a use-after-free.\n\nTo fix this, do the same dance that gem_close itself does.\n(f6cd7daecff5 drm: Release driver references to handle before making it available again)\nFirst idr_replace the old handle to NULL. Later, if the prime\noperations are successful, actually close it.\n\ncreate_tail required a similar dance to avoid a similar problem.\n(bd46cece51a3 drm/gem: Fix race in drm_gem_handle_create_tail())\nIt idr_allocs the new handle with NULL, then swaps in the correct\nobject later to avoid races. We don't need to do that here, since\nthe only operations that could race are drm_prime, and\nchange_handle holds the prime lock for the entire duration.\n\nv2: cleanups of error paths","modified":"2026-07-11T03:54:19.850056269Z","published":"2026-05-28T09:40:32.050Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46215.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5e28b7b94408897e41c63477aabc9e1db439bc8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61bd96d3e5472c253f9c1ab77608f0c8aaa9d025"},{"type":"WEB","url":"https://git.kernel.org/stable/c/672464dd53231509c9c771110798c56d4660e19e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46215.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46215"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"EVIDENCE","url":"https://github.com/0xCyberstan/CVE-2026-46215-POC"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"53096728b8910c6916ecc6c46a5abc5c678b58d9"},{"fixed":"672464dd53231509c9c771110798c56d4660e19e"},{"fixed":"61bd96d3e5472c253f9c1ab77608f0c8aaa9d025"},{"fixed":"5e28b7b94408897e41c63477aabc9e1db439bc8c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46215.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.32"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46215.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}