CVE-2026-98838

Что произошло

In the Linux kernel, the following vulnerability has been resolved: vt: skip screen update for DEC alignment test on backgroup consoles [BUG] Recently, we encountered a KASAN warning as follows: BUG: KASAN: slab-out-of-bounds in fb_pad_aligned_buffer+0x11f/0x140 Read of size 1 at addr ff1100015fd9f6a4 by task tty_fbcon_oob/1239 CPU: 7 UID: 0 PID: 1239 Comm: tty_fbcon_oob Not tainted 7.3.0-rc1 #100 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc41 04/01/2014 Call Trace: ... kasan_report+0xf0/0x120 fb_pad_aligned_buffer+0x11f/0x140 ccw_putcs+0x86c/0xa80 fbcon_putcs+0x338/0x410 do_update_region+0x21d/0x450 do_con_write+0x1e0e/0x4880 con_write+0x13/0x80 n_tty_write+0x374/0x1010 file_tty_write.isra.0+0x404/0x7a0 ... reproduce: 1) open /dev/tty0, set a KDFONTOP ioctl with op.op = KD_FONT_OP_SET, op.width = 8 and op.height = 16 (visible VC1) 2) open /dev/tty1, set a KDFONTOP ioctl with op.op = KD_FONT_OP_SET, op.width = 28 and op.height = 24 (invisible VC2) 3) echo 3 > /sys/devices/virtual/graphics/fbcon/rotate_all 4) write EShash8(esc hash8) to tty1 [CAUSE] All VCs render to the framebuffer. setfont only modifies the target VC's font without resizing the framebuffer backing buffer (par->rotated.buf); the buffer is only resized for the visible VC (fbcon_do_set_font -> ... -> vc_do_resize -> update_screen). This relies on the con_should_update() check performed before every update_region(). However, the ESC # 8 path (do_con_trol -> do_update_region) omits the con_should_update() check. After changing the font size of an invisible VC, do_update_region() fills using the new font size against a buffer that was never resized, causing an out-of-bounds access. [FIX] Only push the update when the console is visible and not blanked, add the con_should_update() check in the do_con_trol() like every other call site of do_update_region() (update_region(), invert_screen(), ...).

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "d388658505bf707ff0cd7142c37c868febf8c2a5",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "82561eee12a342994daf3a70590f5d07c35da743",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "663cf98baced6941a0f3f00e1be61024e57d4429",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "2fc4e71aefab57c80ccc9775aad2af503fc90810",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "985c000b046ca4ee11ee34ef85db500c569ef6e8",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "ad06f7312d3f615dd466483ce81a9b9619166686",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "0ee53081425a1a31ce15089012cd96b8353eb44e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
  "lessThan": "0928ed9bd7946baee911efa401088697836e3b1e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "2.6.12"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "2.6.12",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "5.10.273",
  "versionType": "semver",
  "lessThanOrEqual": "5.10.*"
}

{
  "status": "unaffected",
  "version": "5.15.224",
  "versionType": "semver",
  "lessThanOrEqual": "5.15.*"
}

{
  "status": "unaffected",
  "version": "6.1.191",
  "versionType": "semver",
  "lessThanOrEqual": "6.1.*"
}

{
  "status": "unaffected",
  "version": "6.6.160",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.113",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.56",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.10",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:07.957907+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.930920+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.930920+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.930920+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:07.957907+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.930920+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены04.11.2026, 00:16
2. Данные обновлены03.11.2026, 00:15
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены30.10.2026, 20:51
6. Данные обновлены30.10.2026, 15:58
7. Данные обновлены29.10.2026, 12:47
8. Опубликована28.10.2026, 23:15

Личная заметка и статус

Другие CVE того же продукта