{"id":"DEBIAN-CVE-2024-26874","details":"In the Linux kernel, the following vulnerability has been resolved:  drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip  It's possible that mtk_crtc-\u003eevent is NULL in mtk_drm_crtc_finish_page_flip().  pending_needs_vblank value is set by mtk_crtc-\u003eevent, but in mtk_drm_crtc_atomic_flush(), it's is not guarded by the same lock in mtk_drm_finish_page_flip(), thus a race condition happens.  Consider the following case:  CPU1                              CPU2 step 1: mtk_drm_crtc_atomic_begin() mtk_crtc-\u003eevent is not null,                                   step 1:                                   mtk_drm_crtc_atomic_flush:                                   mtk_drm_crtc_update_config(                                       !!mtk_crtc-\u003eevent) step 2: mtk_crtc_ddp_irq -\u003e mtk_drm_finish_page_flip: lock mtk_crtc-\u003eevent set to null, pending_needs_vblank set to false unlock                                   pending_needs_vblank set to true,                                    step 2:                                   mtk_crtc_ddp_irq -\u003e                                   mtk_drm_finish_page_flip called again,                                   pending_needs_vblank is still true                                   //null pointer  Instead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more efficient to just check if mtk_crtc-\u003eevent is null before use.","modified":"2026-09-01T20:05:23.237740004Z","published":"2024-04-17T11:15:09.670Z","upstream":["CVE-2024-26874"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-26874"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.85-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26874.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26874.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26874.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}