CVE-2025-39967 (GCVE-0-2025-39967)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:55 – Updated: 2025-10-15 07:55
VLAI?
Title
fbcon: fix integer overflow in fbcon_do_set_font
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: fix integer overflow in fbcon_do_set_font Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters. The vulnerabilities occur when: 1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow 3. This results in smaller allocations than expected, leading to buffer overflows during font data copying. Add explicit overflow checking using check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 96e41fc29e8af5c5085fb8a79cab8d0d00bab86c , < 994bdc2d23c79087fbf7dcd9544454e8ebcef877 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < 9c8ec14075c5317edd6b242f1be8167aa1e4e333 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < b8a6e85328aeb9881531dbe89bcd2637a06c3c95 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < a6eb9f423b3db000aaedf83367b8539f6b72dcfc (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < adac90bb1aaf45ca66f9db8ac100be16750ace78 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < 4a4bac869560f943edbe3c2b032062f6673b13d3 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7 (git)
Affected: 39b3cffb8cf3111738ea993e2757ab382253d86a , < 1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe (git)
Affected: ae021a904ac82d9fc81c25329d3c465c5a7d5686 (git)
Affected: 451bffa366f2cc0e5314807cb847f31c0226efed (git)
Affected: 2c455e9c5865861f5ce09c5f596909495ed7657c (git)
Affected: 72f099805dbc907fbe8fa19bccdc31d3e2ee6e9e (git)
Affected: 34cf1aff169dc6dedad8d79da7bf1b4de2773dbc (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.155 , ≤ 6.1.* (semver)
Unaffected: 6.6.109 , ≤ 6.6.* (semver)
Unaffected: 6.12.50 , ≤ 6.12.* (semver)
Unaffected: 6.16.10 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.