{"id":"CVE-2026-97900","state":"PUBLISHED","title":"drm/drm_exec: fix up contended obj when num_objects is 0","description":"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 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.","publishedAt":"2026-09-25T10:22:28.057Z","updatedAt":"2026-10-19T09:10:26.649Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"506cfed91e50cc8055799480a2fde5a18f63a21c","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"831cd124ce99c3e61266bed30519d52f7c26abed","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"f3e74866018dab793ebee1fdf0ef34f7271d1f8c","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"a565022c02f218ec9789c2baf4690792e7a48cbb","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"159720704d9d652b64390c11fb971e15b0a78d23","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_exec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_exec.c"]}],"references":["https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c","https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed","https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c","https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb","https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97900.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97900","state":"PUBLISHED","datePublished":"2026-09-25T10:22:28.057Z","dateUpdated":"2026-10-19T09:10:26.649Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:18:58.200Z"},"containers":{"cna":{"title":"drm/drm_exec: fix up contended obj when num_objects is 0","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"506cfed91e50cc8055799480a2fde5a18f63a21c","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"831cd124ce99c3e61266bed30519d52f7c26abed","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"f3e74866018dab793ebee1fdf0ef34f7271d1f8c","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"a565022c02f218ec9789c2baf4690792e7a48cbb","versionType":"git"},{"version":"09593216bff15866f95c8ad406cb7fdcec1ee40a","status":"affected","lessThan":"159720704d9d652b64390c11fb971e15b0a78d23","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_exec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_exec.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c"},{"url":"https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed"},{"url":"https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c"},{"url":"https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb"},{"url":"https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:10:26.649Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}