{
  "cveId": "CVE-2024-26798",
  "url": "https://patchblox.com/security/cve/CVE-2024-26798",
  "summary": "CVE-2024-26798 is fixed in 22 products on 1 platform, first by DEBIAN-CVE-2024-26798, released April 4, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fbcon: always restore the old font data in fbcon...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fbcon: always restore the old font data in fbcon_do_set_font()  Commit a5a923038d70 (fbdev: fbcon: Properly revert changes when vc_resize() failed) started restoring old font data upon failure (of vc_resize()). But it performs so only for user fonts. It means that the \u0022system\u0022/internal fonts are not restored at all. So in result, the very first call to fbcon_do_set_font() performs no restore at all upon failing vc_resize().  This can be reproduced by Syzkaller to crash the system on the next invocation of font_get(). It\u0027s rather hard to hit the allocation failure in vc_resize() on the first font_set(), but not impossible. Esp. if fault injection is used to aid the execution/failure. It was demonstrated by Sirius:   BUG: unable to handle page fault for address: fffffffffffffff8   #PF: supervisor read access in kernel mode   #PF: error_code(0x0000) - not-present page   PGD cb7b067 P4D cb7b067 PUD cb7d067 PMD 0   Oops: 0000 [#1] PREEMPT SMP KASAN   CPU: 1 PID: 8007 Comm: poc Not tainted 6.7.0-g9d1694dc91ce #20   Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.15.0-1 04/01/2014   RIP: 0010:fbcon_get_font\u002B0x229/0x800 drivers/video/fbdev/core/fbcon.c:2286   Call Trace:    \u003CTASK\u003E    con_font_get drivers/tty/vt/vt.c:4558 [inline]    con_font_op\u002B0x1fc/0xf20 drivers/tty/vt/vt.c:4673    vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]    vt_ioctl\u002B0x632/0x2ec0 drivers/tty/vt/vt_ioctl.c:752    tty_ioctl\u002B0x6f8/0x1570 drivers/tty/tty_io.c:2803    vfs_ioctl fs/ioctl.c:51 [inline]   ...  So restore the font data in any case, not only for user fonts. Note the later \u0027if\u0027 is now protected by \u0027old_userfont\u0027 and not \u0027old_data\u0027 as the latter is always set now. (And it is supposed to be non-NULL. Otherwise we would see the bug above again.)",
  "published": "2024-04-04T09:15:08Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00327,
  "epssPercentile": 0.25943,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-headers",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "kernel-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "kernel-livepatch-6.1.82-99.168",
      "release": "amzn 2023",
      "fixedVersion": "1.0-0.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "kernel-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "kernel-tools",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.82-1",
      "fix": "DEBIAN-CVE-2024-26798",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-26798",
      "released": "2024-04-04T09:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.7.9-1",
      "fix": "DEBIAN-CVE-2024-26798",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-26798",
      "released": "2024-04-04T09:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.7.9-1",
      "fix": "DEBIAN-CVE-2024-26798",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-26798",
      "released": "2024-04-04T09:15:08Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.82-99.168.amzn2023",
      "fix": "ALAS2023-2024-784",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    },
    {
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      "product": "python3-perf",
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2024-784",
      "released": "2024-12-05T20:34:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}