CVE-2026-80785 (GCVE-0-2026-80785)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-07 14:21
VLAI
Title
fbdev: serialize mode sysfs access with lock_fb_info()
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: serialize mode sysfs access with lock_fb_info() show_mode(), show_modes(), and store_mode() access fb_info->modelist and fb_info->mode without holding lock_fb_info(). store_modes() takes lock_fb_info() while replacing the modelist and freeing the old one. A concurrent reader or writer can load a pointer to an old modelist entry before store_modes() frees it, then dereference freed memory or store a stale freed pointer in fb_info->mode. Take lock_fb_info() in show_mode(), show_modes(), and store_mode() to serialize with store_modes(). In show_mode(), copy the mode to the stack and format after dropping the lock. In store_mode(), split activate() into a _locked variant to avoid double-locking, and hold the locks for the modelist walk, mode conversion, activation, and fb_info->mode assignment together.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 26135631ed8e487bc6aef70cc41934e258d09bbe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 061db6b7a910b8378f3b2df64f8c0a3ddc6e85f2 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: serialize mode sysfs access with lock_fb_info()\n\nshow_mode(), show_modes(), and store_mode() access fb_info-\u003emodelist\nand fb_info-\u003emode without holding lock_fb_info(). store_modes() takes\nlock_fb_info() while replacing the modelist and freeing the old one.\n\nA concurrent reader or writer can load a pointer to an old modelist\nentry before store_modes() frees it, then dereference freed memory or\nstore a stale freed pointer in fb_info-\u003emode.\n\nTake lock_fb_info() in show_mode(), show_modes(), and store_mode() to\nserialize with store_modes(). In show_mode(), copy the mode to the\nstack and format after dropping the lock. In store_mode(), split\nactivate() into a _locked variant to avoid double-locking, and hold\nthe locks for the modelist walk, mode conversion, activation, and\nfb_info-\u003emode assignment together."
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    "dateReserved": "2026-08-26T14:34:25.793Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: serialize mode sysfs access with lock_fb_info()\n\nshow_mode(), show_modes(), and store_mode() access fb_info-\u003emodelist\nand fb_info-\u003emode without holding lock_fb_info(). store_modes() takes\nlock_fb_info() while replacing the modelist and freeing the old one.\n\nA concurrent reader or writer can load a pointer to an old modelist\nentry before store_modes() frees it, then dereference freed memory or\nstore a stale freed pointer in fb_info-\u003emode.\n\nTake lock_fb_info() in show_mode(), show_modes(), and store_mode() to\nserialize with store_modes(). In show_mode(), copy the mode to the\nstack and format after dropping the lock. In store_mode(), split\nactivate() into a _locked variant to avoid double-locking, and hold\nthe locks for the modelist walk, mode conversion, activation, and\nfb_info-\u003emode assignment together."
          }
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.