{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49948", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.382Z", "datePublished": "2025-06-18T11:00:12.364Z", "dateUpdated": "2026-08-05T08:56:50.380Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:50.380Z" }, "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." } ], "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 impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/vt.c" ], "versions": [ { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "c555cf04684fde39b5b0dd9fd80730030ee10c4a", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "e9ba4611ddf676194385506222cce7b0844e708e", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "f74b4a41c5d7c9522469917e3072e55d435efd9e", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "1cf1930369c9dc428d827b60260c53271bff3285", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "989201bb8c00b222235aff04e6200230d29dc7bb", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "2535431ae967ad17585513649625fea7db28d4db", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "c904fe03c4bd1f356a58797d39e2a5d0ca15cefc", "status": "affected", "versionType": "git" }, { "version": "009e39ae44f4191188aeb6dfbf661b771dbbe515", "lessThan": "566f9c9f89337792070b5a6062dff448b3e7977f", "status": "affected", "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", "lessThan": "3.3", "status": "affected", "versionType": "semver" }, { "version": "3.10.105", "lessThan": "3.11", "status": "affected", "versionType": "semver" }, { "version": "3.12.68", "lessThan": "3.13", "status": "affected", "versionType": "semver" }, { "version": "3.16.40", "lessThan": "3.17", "status": "affected", "versionType": "semver" }, { "version": "3.18.45", "lessThan": "3.19", "status": "affected", "versionType": "semver" }, { "version": "4.1.36", "lessThan": "4.2", "status": "affected", "versionType": "semver" }, { "version": "4.4.31", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.8.7", "lessThan": "4.9", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/vt/vt.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.328", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.293", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.258", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.213", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.142", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.66", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.8", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "4.9.328" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "4.14.293" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "4.19.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.4.213" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.19.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.7" } ] } ] } ], "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" } ], "title": "vt: Clear selection before changing the font", "x_generator": { "engine": "bippy-1.2.0" } } } }