CVE-2022-49948 (GCVE-0-2022-49948)
Vulnerability from cvelistv5
Published
2025-06-18 11:00
Modified
2026-10-15 21:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: vt: Clear selection before changing the font When changing the console font with ioctl(KDFONTOP) the new font size can be bigger than the previous font. A previous selection may thus now be outside of the new screen size and thus trigger out-of-bounds accesses to graphics memory if the selection is removed in vc_do_resize(). Prevent such out-of-memory accesses by dropping the selection before the various con_font_set() console handlers are called.
References
Impacted products
Vendor Product Version
Linux Linux Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: 009e39ae44f4191188aeb6dfbf661b771dbbe515
Version: e60f8fcce05042e8f8cea25ee81fecc1222114cf
Version: 5812a9bc9d68a82c2cc839f88e6f7a05093ab39d
Version: 863ad19fd654c485e3beec3575c4d74a1e74369e
Version: dbc3fd44f957a39407e889287bf61fa0ef3ecc14
Version: 0b2a0a58ad22f9d6dfc641bc5ec46057493f22a5
Version: 9f2d48f0745f921040df91bfe8fa7f0339cd7497
Version: 3425e397fb23cc2e8e6fb8f5b8226dcb447e84dd
Version: eeae0a12a16650ff494d5faefa371cd9e7079575
Version: 3.2.85   ≤
Version: 3.10.105   ≤
Version: 3.12.68   ≤
Version: 3.16.40   ≤
Version: 3.18.45   ≤
Version: 4.1.36   ≤
Version: 4.4.31   ≤
Version: 4.8.7   ≤
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          "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."
        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "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\u2014setting a console selection and changing the font to a larger size\u2014so 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-\u003esignal-\u003etty == 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."
            }
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        "dateUpdated": "2026-08-05T08:56:50.380Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/e9ba4611ddf676194385506222cce7b0844e708e"
        },
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          "url": "https://git.kernel.org/stable/c/566f9c9f89337792070b5a6062dff448b3e7977f"
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      "title": "vt: Clear selection before changing the font",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49948",
    "datePublished": "2025-06-18T11:00:12.364Z",
    "dateReserved": "2025-06-18T10:57:27.382Z",
    "dateUpdated": "2026-10-15T21:31:17.598Z",
    "state": "PUBLISHED"
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controls both prerequisites\\u2014setting a console selection and changing the font to a larger size\\u2014so 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-\u003esignal-\u003etty == 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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"009e39ae44f4191188aeb6dfbf661b771dbbe515\", \"lessThan\": \"c555cf04684fde39b5b0dd9fd80730030ee10c4a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"009e39ae44f4191188aeb6dfbf661b771dbbe515\", \"lessThan\": \"e9ba4611ddf676194385506222cce7b0844e708e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"009e39ae44f4191188aeb6dfbf661b771dbbe515\", \"lessThan\": \"f74b4a41c5d7c9522469917e3072e55d435efd9e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"version\": \"3.12.68\", \"lessThan\": \"3.13\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.16.40\", \"lessThan\": \"3.17\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.18.45\", \"lessThan\": \"3.19\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.1.36\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.4.31\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.8.7\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/tty/vt/vt.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.328\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.293\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.213\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.142\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.66\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.19.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/vt/vt.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.328\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.293\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.258\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.213\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.142\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.66\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.8\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.85\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.10.105\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.12.68\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.40\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.18.45\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.1.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.8.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:56:50.380Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49948\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:31:17.598Z\", \"dateReserved\": \"2025-06-18T10:57:27.382Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-06-18T11:00:12.364Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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