{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2024-26798",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-26798",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-04-04T08:20:27.195Z",
    "updatedAt": "2026-05-23T15:37:58.296Z",
    "importedAt": "2026-10-24T01:57:07.518Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "fbcon: always restore the old font data in fbcon_do_set_font()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: always restore the old font data in fbcon_do_set_font()\n\nCommit a5a923038d70 (fbdev: fbcon: Properly revert changes when\nvc_resize() failed) started restoring old font data upon failure (of\nvc_resize()). But it performs so only for user fonts. It means that the\n\"system\"/internal fonts are not restored at all. So in result, the very\nfirst call to fbcon_do_set_font() performs no restore at all upon\nfailing vc_resize().\n\nThis can be reproduced by Syzkaller to crash the system on the next\ninvocation of font_get(). It's rather hard to hit the allocation failure\nin vc_resize() on the first font_set(), but not impossible. Esp. if\nfault injection is used to aid the execution/failure. It was\ndemonstrated by Sirius:\n  BUG: unable to handle page fault for address: fffffffffffffff8\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD cb7b067 P4D cb7b067 PUD cb7d067 PMD 0\n  Oops: 0000 [#1] PREEMPT SMP KASAN\n  CPU: 1 PID: 8007 Comm: poc Not tainted 6.7.0-g9d1694dc91ce #20\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:fbcon_get_font+0x229/0x800 drivers/video/fbdev/core/fbcon.c:2286\n  Call Trace:\n   <TASK>\n   con_font_get drivers/tty/vt/vt.c:4558 [inline]\n   con_font_op+0x1fc/0xf20 drivers/tty/vt/vt.c:4673\n   vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]\n   vt_ioctl+0x632/0x2ec0 drivers/tty/vt/vt_ioctl.c:752\n   tty_ioctl+0x6f8/0x1570 drivers/tty/tty_io.c:2803\n   vfs_ioctl fs/ioctl.c:51 [inline]\n  ...\n\nSo restore the font data in any case, not only for user fonts. Note the\nlater 'if' is now protected by 'old_userfont' and not 'old_data' as the\nlatter is always set now. (And it is supposed to be non-NULL. Otherwise\nwe would see the bug above again.)",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "868749a7456dc48e93887a8474194e2ee6d6c21f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ae68f57df3335679653868fafccd8c88ef84ae98"
            },
            {
              "version": "ebd6f886aa2447fcfcdce5450c9e1028e1d681bb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "20a4b5214f7bee13c897477168c77bbf79683c3d"
            },
            {
              "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2f91a96b892fab2f2543b4a55740c5bee36b1a6b"
            },
            {
              "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "73a6bd68a1342f3a44cac9dffad81ad6a003e520"
            },
            {
              "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a2c881413dcc5d801bdc9535e51270cc88cb9cd8"
            },
            {
              "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f"
            },
            {
              "version": "f08ccb792d3eaf1dc62d8cbf6a30d6522329f660",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.15.64",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.151"
            },
            {
              "version": "5.19.6",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.20"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.0"
            },
            {
              "version": "5.15.151",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.81",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.21",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.7.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.7.*"
            },
            {
              "version": "6.8",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}