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EUVD-2026-344816

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:58

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:58:11.639113+00:00",
  "id": "EUVD-2026-344816"
}

CVE-2022-49948 (GCVE-0-2022-49948)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-08-05 08:56

Title

vt: Clear selection before changing the font

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c555cf04684fde39b…
https://git.kernel.org/stable/c/e9ba4611ddf676194…
https://git.kernel.org/stable/c/f74b4a41c5d7c9522…
https://git.kernel.org/stable/c/1cf1930369c9dc428…
https://git.kernel.org/stable/c/989201bb8c00b2222…
https://git.kernel.org/stable/c/2535431ae967ad175…
https://git.kernel.org/stable/c/c904fe03c4bd1f356…
https://git.kernel.org/stable/c/566f9c9f893377920…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < c555cf04684fde39b5b0dd9fd80730030ee10c4a (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < e9ba4611ddf676194385506222cce7b0844e708e (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < f74b4a41c5d7c9522469917e3072e55d435efd9e (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < 1cf1930369c9dc428d827b60260c53271bff3285 (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < 989201bb8c00b222235aff04e6200230d29dc7bb (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < 2535431ae967ad17585513649625fea7db28d4db (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < c904fe03c4bd1f356a58797d39e2a5d0ca15cefc (git) Affected: 009e39ae44f4191188aeb6dfbf661b771dbbe515 , < 566f9c9f89337792070b5a6062dff448b3e7977f (git) Affected: e60f8fcce05042e8f8cea25ee81fecc1222114cf (git) Affected: 5812a9bc9d68a82c2cc839f88e6f7a05093ab39d (git) Affected: 863ad19fd654c485e3beec3575c4d74a1e74369e (git) Affected: dbc3fd44f957a39407e889287bf61fa0ef3ecc14 (git) Affected: 0b2a0a58ad22f9d6dfc641bc5ec46057493f22a5 (git) Affected: 9f2d48f0745f921040df91bfe8fa7f0339cd7497 (git) Affected: 3425e397fb23cc2e8e6fb8f5b8226dcb447e84dd (git) Affected: eeae0a12a16650ff494d5faefa371cd9e7079575 (git) Affected: 3.2.85 , < 3.3 (semver) Affected: 3.10.105 , < 3.11 (semver) Affected: 3.12.68 , < 3.13 (semver) Affected: 3.16.40 , < 3.17 (semver) Affected: 3.18.45 , < 3.19 (semver) Affected: 4.1.36 , < 4.2 (semver) Affected: 4.4.31 , < 4.5 (semver) Affected: 4.8.7 , < 4.9 (semver)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (semver) Unaffected: 4.9.328 , ≤ 4.9.* (semver) Unaffected: 4.14.293 , ≤ 4.14.* (semver) Unaffected: 4.19.258 , ≤ 4.19.* (semver) Unaffected: 5.4.213 , ≤ 5.4.* (semver) Unaffected: 5.10.142 , ≤ 5.10.* (semver) Unaffected: 5.15.66 , ≤ 5.15.* (semver) Unaffected: 5.19.8 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/vt/vt.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dbc3fd44f957a39407e889287bf61fa0ef3ecc14",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "0b2a0a58ad22f9d6dfc641bc5ec46057493f22a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9f2d48f0745f921040df91bfe8fa7f0339cd7497",
              "versionType": "git"
            },
            {
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              "version": "3425e397fb23cc2e8e6fb8f5b8226dcb447e84dd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "eeae0a12a16650ff494d5faefa371cd9e7079575",
              "versionType": "git"
            },
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              "lessThan": "3.3",
              "status": "affected",
              "version": "3.2.85",
              "versionType": "semver"
            },
            {
              "lessThan": "3.11",
              "status": "affected",
              "version": "3.10.105",
              "versionType": "semver"
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            {
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              "versionType": "semver"
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              "status": "affected",
              "version": "3.16.40",
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            {
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              "status": "affected",
              "version": "3.18.45",
              "versionType": "semver"
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              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.36",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.31",
              "versionType": "semver"
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              "lessThan": "4.9",
              "status": "affected",
              "version": "4.8.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/vt/vt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.328",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.213",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.328",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.293",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.258",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.142",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.66",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.8",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.2.85",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.12.68",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:50.380Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49948",
    "datePublished": "2025-06-18T11:00:12.364Z",
    "dateReserved": "2025-06-18T10:57:27.382Z",
    "dateUpdated": "2026-08-05T08:56:50.380Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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EUVD-2026-344816

CVE-2022-49948 (GCVE-0-2022-49948)

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Nomenclature

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