{"id":"CVE-2022-49948","state":"PUBLISHED","title":"vt: Clear selection before changing the font","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvt: Clear selection before changing the font\n\nWhen changing the console font with ioctl(KDFONTOP) the new font size\ncan be bigger than the previous font. A previous selection may thus now\nbe outside of the new screen size and thus trigger out-of-bounds\naccesses to graphics memory if the selection is removed in\nvc_do_resize().\n\nPrevent such out-of-memory accesses by dropping the selection before the\nvarious con_font_set() console handlers are called.","publishedAt":"2025-06-18T11:00:12.364Z","updatedAt":"2026-10-15T21:31:17.598Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"c555cf04684fde39b5b0dd9fd80730030ee10c4a","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"e9ba4611ddf676194385506222cce7b0844e708e","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"f74b4a41c5d7c9522469917e3072e55d435efd9e","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"1cf1930369c9dc428d827b60260c53271bff3285","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"989201bb8c00b222235aff04e6200230d29dc7bb","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"2535431ae967ad17585513649625fea7db28d4db","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"c904fe03c4bd1f356a58797d39e2a5d0ca15cefc","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"566f9c9f89337792070b5a6062dff448b3e7977f","versionType":"git"},{"version":"e60f8fcce05042e8f8cea25ee81fecc1222114cf","status":"affected","versionType":"git"},{"version":"5812a9bc9d68a82c2cc839f88e6f7a05093ab39d","status":"affected","versionType":"git"},{"version":"863ad19fd654c485e3beec3575c4d74a1e74369e","status":"affected","versionType":"git"},{"version":"dbc3fd44f957a39407e889287bf61fa0ef3ecc14","status":"affected","versionType":"git"},{"version":"0b2a0a58ad22f9d6dfc641bc5ec46057493f22a5","status":"affected","versionType":"git"},{"version":"9f2d48f0745f921040df91bfe8fa7f0339cd7497","status":"affected","versionType":"git"},{"version":"3425e397fb23cc2e8e6fb8f5b8226dcb447e84dd","status":"affected","versionType":"git"},{"version":"eeae0a12a16650ff494d5faefa371cd9e7079575","status":"affected","versionType":"git"},{"version":"3.2.85","status":"affected","lessThan":"3.3","versionType":"semver"},{"version":"3.10.105","status":"affected","lessThan":"3.11","versionType":"semver"},{"version":"3.12.68","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.16.40","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"3.18.45","status":"affected","lessThan":"3.19","versionType":"semver"},{"version":"4.1.36","status":"affected","lessThan":"4.2","versionType":"semver"},{"version":"4.4.31","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.8.7","status":"affected","lessThan":"4.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.9.328","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.293","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.258","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.213","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.142","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.66","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.8","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]}],"references":["https://git.kernel.org/stable/c/c555cf04684fde39b5b0dd9fd80730030ee10c4a","https://git.kernel.org/stable/c/e9ba4611ddf676194385506222cce7b0844e708e","https://git.kernel.org/stable/c/f74b4a41c5d7c9522469917e3072e55d435efd9e","https://git.kernel.org/stable/c/1cf1930369c9dc428d827b60260c53271bff3285","https://git.kernel.org/stable/c/989201bb8c00b222235aff04e6200230d29dc7bb","https://git.kernel.org/stable/c/2535431ae967ad17585513649625fea7db28d4db","https://git.kernel.org/stable/c/c904fe03c4bd1f356a58797d39e2a5d0ca15cefc","https://git.kernel.org/stable/c/566f9c9f89337792070b5a6062dff448b3e7977f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49948.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49948","state":"PUBLISHED","datePublished":"2025-06-18T11:00:12.364Z","dateUpdated":"2026-10-15T21:31:17.598Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-06-18T10:57:27.382Z"},"containers":{"cna":{"title":"vt: Clear selection before changing the font","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvt: Clear selection before changing the font\n\nWhen changing the console font with ioctl(KDFONTOP) the new font size\ncan be bigger than the previous font. A previous selection may thus now\nbe outside of the new screen size and thus trigger out-of-bounds\naccesses to graphics memory if the selection is removed in\nvc_do_resize().\n\nPrevent such out-of-memory accesses by dropping the selection before the\nvarious con_font_set() console handlers are called."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"c555cf04684fde39b5b0dd9fd80730030ee10c4a","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"e9ba4611ddf676194385506222cce7b0844e708e","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"f74b4a41c5d7c9522469917e3072e55d435efd9e","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"1cf1930369c9dc428d827b60260c53271bff3285","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"989201bb8c00b222235aff04e6200230d29dc7bb","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"2535431ae967ad17585513649625fea7db28d4db","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"c904fe03c4bd1f356a58797d39e2a5d0ca15cefc","versionType":"git"},{"version":"009e39ae44f4191188aeb6dfbf661b771dbbe515","status":"affected","lessThan":"566f9c9f89337792070b5a6062dff448b3e7977f","versionType":"git"},{"version":"e60f8fcce05042e8f8cea25ee81fecc1222114cf","status":"affected","versionType":"git"},{"version":"5812a9bc9d68a82c2cc839f88e6f7a05093ab39d","status":"affected","versionType":"git"},{"version":"863ad19fd654c485e3beec3575c4d74a1e74369e","status":"affected","versionType":"git"},{"version":"dbc3fd44f957a39407e889287bf61fa0ef3ecc14","status":"affected","versionType":"git"},{"version":"0b2a0a58ad22f9d6dfc641bc5ec46057493f22a5","status":"affected","versionType":"git"},{"version":"9f2d48f0745f921040df91bfe8fa7f0339cd7497","status":"affected","versionType":"git"},{"version":"3425e397fb23cc2e8e6fb8f5b8226dcb447e84dd","status":"affected","versionType":"git"},{"version":"eeae0a12a16650ff494d5faefa371cd9e7079575","status":"affected","versionType":"git"},{"version":"3.2.85","status":"affected","lessThan":"3.3","versionType":"semver"},{"version":"3.10.105","status":"affected","lessThan":"3.11","versionType":"semver"},{"version":"3.12.68","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.16.40","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"3.18.45","status":"affected","lessThan":"3.19","versionType":"semver"},{"version":"4.1.36","status":"affected","lessThan":"4.2","versionType":"semver"},{"version":"4.4.31","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.8.7","status":"affected","lessThan":"4.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.9.328","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.293","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.258","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.213","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.142","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.66","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.8","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c555cf04684fde39b5b0dd9fd80730030ee10c4a"},{"url":"https://git.kernel.org/stable/c/e9ba4611ddf676194385506222cce7b0844e708e"},{"url":"https://git.kernel.org/stable/c/f74b4a41c5d7c9522469917e3072e55d435efd9e"},{"url":"https://git.kernel.org/stable/c/1cf1930369c9dc428d827b60260c53271bff3285"},{"url":"https://git.kernel.org/stable/c/989201bb8c00b222235aff04e6200230d29dc7bb"},{"url":"https://git.kernel.org/stable/c/2535431ae967ad17585513649625fea7db28d4db"},{"url":"https://git.kernel.org/stable/c/c904fe03c4bd1f356a58797d39e2a5d0ca15cefc"},{"url":"https://git.kernel.org/stable/c/566f9c9f89337792070b5a6062dff448b3e7977f"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires local ioctl access to a virtual terminal device (KDFONTOP and TIOCLINUX), not network or adjacent-network reachability.\nAC:L - The attacker fully controls both prerequisites—setting a console selection and changing the font to a larger size—so the out-of-bounds write in imageblit can be triggered reliably without depending on external conditions.\nPR:L - KDFONTOP SET and TIOCL_SETSEL are permitted to the unprivileged owner of the controlling VT (current->signal->tty == tty); CAP_SYS_TTY_CONFIG/CAP_SYS_ADMIN are not required, matching other VT/fbcon scores.\nUI:N - The attacker performs the ioctls directly on their own VT session; no separate victim action is required.\nS:U - Impact is confined to the host kernel authority (memory corruption / DoS); there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The bug is a confirmed out-of-bounds write (stack and vmalloc) via imageblit; per kernel CVSS guidance, such memory corruption can be leveraged for arbitrary disclosure primitives.\nI:H - Out-of-bounds writes past the framebuffer and into stack/adjacent memory enable corruption exploitable for control-flow hijacking, consistent with similar fast_imageblit/fbcon OOB-write CVEs.\nA:H - Triggering the path causes kernel KASAN reports and oopses (vmalloc/stack out-of-bounds in imageblit), which is a High availability 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