{"id":"CVE-2026-97900","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/drm_exec: fix up contended obj when num_objects is 0\n\ndrm_exec_prepare_array() silently returns success without calling\ndrm_exec_lock_contended() when num_objects i…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/drm_exec: fix up contended obj when num_objects is 0\n\ndrm_exec_prepare_array() silently returns success without calling\ndrm_exec_lock_contended() when num_objects i…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"Linux","product":"Linux","affected":["Linux >= 09593216bff15866f95c8ad406cb7fdcec1ee40a < 506cfed91e50cc8055799480a2fde5a18f63a21c","Linux >= 09593216bff15866f95c8ad406cb7fdcec1ee40a < 831cd124ce99c3e61266bed30519d52f7c26abed","Linux >= 09593216bff15866f95c8ad406cb7fdcec1ee40a < f3e74866018dab793ebee1fdf0ef34f7271d1f8c","Linux >= 09593216bff15866f95c8ad406cb7fdcec1ee40a < a565022c02f218ec9789c2baf4690792e7a48cbb","Linux >= 09593216bff15866f95c8ad406cb7fdcec1ee40a < 159720704d9d652b64390c11fb971e15b0a78d23","Linux 6.6"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:08.493","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97900","references":[{"url":"https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97900.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97900"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541095"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97900"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97900"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97900.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00168,"epssPercentile":0.0603,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.896Z","slug":"CVE-2026-97900","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/drm_exec: fix up contended obj when num_objects is 0\n\ndrm_exec_prepare_array() silently returns success without calling\ndrm_exec_lock_contended() when num_objects is zero. This breaks the\ninvariant upheld by drm_exec_lock_obj(), where every entry point into\nthe locking sequence must first attempt to lock any previously\ncontended object before proceeding.\n\nDrivers that chain multiple drm_exec_prepare_array() calls per\ndrm_exec_until_all_locked() iteration (e.g. amdgpu's userq signal/wait\nioctls, which prepare separate read and write BO arrays) can pass an\nempty array for one of the two calls. If contention is hit while\npreparing the non-empty array, exec->contended is set and the loop\nretries; on retry, the empty-array call preceding it is a no-op that\nnever clears exec->contended, so drm_exec_retry_on_contention()\nimmediately jumps back to the top of the loop without ever reaching\nthe call that would resolve the contention. This spins forever.\n\nFix it by having drm_exec_prepare_array() call drm_exec_lock_contended()\ndirectly when num_objects is zero, so a pending contended object dont\nloop infinitely.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97900.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":213538,"id":"CVE-2026-97900","ts":1790754769746,"field":"cvss","old":null,"new":"5.5"},{"seq":213537,"id":"CVE-2026-97900","ts":1790754769746,"field":"severity","old":"none","new":"medium"}]}