CVE-2024-26798 (GCVE-0-2024-26798)

Vulnerability from cvelistv5 – Published: 2024-04-04 08:20 – Updated: 2026-02-06 16:30
VLAI?
Title
fbcon: always restore the old font data in fbcon_do_set_font()
Summary
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 "system"/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's 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 + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:fbcon_get_font+0x229/0x800 drivers/video/fbdev/core/fbcon.c:2286 Call Trace: <TASK> con_font_get drivers/tty/vt/vt.c:4558 [inline] con_font_op+0x1fc/0xf20 drivers/tty/vt/vt.c:4673 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x632/0x2ec0 drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0x6f8/0x1570 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 'if' is now protected by 'old_userfont' and not 'old_data' as the latter is always set now. (And it is supposed to be non-NULL. Otherwise we would see the bug above again.)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 868749a7456dc48e93887a8474194e2ee6d6c21f , < ae68f57df3335679653868fafccd8c88ef84ae98 (git)
Affected: ebd6f886aa2447fcfcdce5450c9e1028e1d681bb , < 20a4b5214f7bee13c897477168c77bbf79683c3d (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 2f91a96b892fab2f2543b4a55740c5bee36b1a6b (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 73a6bd68a1342f3a44cac9dffad81ad6a003e520 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < a2c881413dcc5d801bdc9535e51270cc88cb9cd8 (git)
Affected: a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24 , < 00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f (git)
Affected: f08ccb792d3eaf1dc62d8cbf6a30d6522329f660 (git)
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    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 5.15.151 , ≤ 5.15.* (semver)
Unaffected: 6.1.81 , ≤ 6.1.* (semver)
Unaffected: 6.6.21 , ≤ 6.6.* (semver)
Unaffected: 6.7.9 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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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   \u003cTASK\u003e\\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 \u0027if\u0027 is now protected by \u0027old_userfont\u0027 and not \u0027old_data\u0027 as the\\nlatter is always set now. (And it is supposed to be non-NULL. Otherwise\\nwe would see the bug above again.)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.151\", \"versionStartIncluding\": \"5.15.64\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.81\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.21\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.9\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.19.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-02-06T16:30:52.928Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26798\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-06T16:30:52.928Z\", \"dateReserved\": \"2024-02-19T14:20:24.179Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-04T08:20:27.195Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • 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.



Detection rules are retrieved from Rulezet.