{"id":"CVE-2026-99151","aliases":[],"title":"drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions","titleSource":"Linux","descriptionSource":"Linux","products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"0b1eebd359685dd681f6e0df5540a5bb985a27bf","status":"affected","lessThan":"4c8b5e5b9776ad08138d79b14238c5742b32911b","versionType":"git"},{"version":"8fa813b7fd1eccbed13e126166cf764f1f11a7d3","status":"affected","lessThan":"55a67aa89342545b89f469dea6f29bfb6fac6f3d","versionType":"git"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99151"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"7.2.9","status":"affected","lessThan":"7.2.13","versionType":"semver"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99151"}],"remediation":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions\n\nallocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() both\nuse ASSERT(stream->sink) before dereferencing stream->sink->link. ASSERT\nis compiled out in production builds, so a NULL stream->sink causes a\nNULL pointer dereference.\n\nlink_set_dpms_off() already guards two earlier accesses to stream->sink\nwith explicit NULL checks, confirming that stream->sink can legitimately\nbe NULL. The subsequent call to deallocate_usb4_bandwidth() had no\nequivalent guard.\n\nReplace the ASSERT() calls with proper NULL checks that return false\nearly, and add a matching stream->sink guard at the call site in\nlink_set_dpms_off() consistent with the surrounding pattern.\n\nv2: Keep the existing ASSERT() calls for diagnostics (to report\n    unexpected NULL sink), and add explicit NULL checks that return false\n    before dereferencing stream->sink. Also add a matching stream->sink\n    guard at the deallocation call site in link_set_dpms_off(). (Alex)\n\n(cherry picked from commit 98029a0ce61feb52c563f65349dd9b25f672e355)","severity":"unknown","score":null,"published":"2026-10-28T10:35:06.866Z","modified":"2026-10-28T10:35:06.866Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://git.kernel.org/stable/c/4c8b5e5b9776ad08138d79b14238c5742b32911b","https://git.kernel.org/stable/c/55a67aa89342545b89f469dea6f29bfb6fac6f3d"],"sources":[{"name":"CVE","id":"CVE-2026-99151","modified":"2026-10-28T10:35:06.866Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99151"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T22:20:33.483Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}