{"id":"CVE-2022-39842","details":"An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.","aliases":["A-245928838","ASB-A-245928838"],"modified":"2026-04-16T00:11:59.742321234Z","published":"2022-09-05T07:15:08.170Z","references":[{"type":"WEB","url":"https://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/"},{"type":"ADVISORY","url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5257"},{"type":"FIX","url":"https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-39842.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"5.19"}]},{"events":[{"introduced":"0"},{"last_affected":"5.19-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.19-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.19-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"11.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"}]}