CVE-2025-68296drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB access in fbcon_remap_all(). Without holding the console lock the call races with switching outputs. VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon function uses struct fb_info.node, which is set by register_framebuffer(). As the fb-helper code currently sets up VGA switcheroo before registering the framebuffer, the value of node is -1 and therefore not a legal value. For example, fbcon uses the value within set_con2fb_map() [1] as an index into an array. Moving vga_switcheroo_client_fb_set() after register_framebuffer() can result in VGA switching that does not switch fbcon correctly. Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(), which already holds the console lock. Fbdev calls fbcon_fb_registered() from within register_framebuffer(). Serializes the helper with VGA switcheroo's call to fbcon_remap_all(). Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info as parameter, it really only needs the contained fbcon state. Moving the call to fbcon initialization is therefore cleaner than before. Only amdgpu, i915, nouveau and radeon support vga_switcheroo. For all other drivers, this change does nothing.
Timeline
ID reserved
By Linux
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 – < 711ebd961190def4c69ea24b2f0be75e995af24a
- affected 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 – < 482330f8261b4bea8146d9bd69c1199e5dfcbb5c
- affected 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 – < 05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2a
- affected 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 – < eb76d0f5553575599561010f24c277cc5b31d003
- affected 2.6.34
- unaffected < 2.6.34
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.61 – ≤ 6.12.*
- unaffected 6.17.11 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References4
- https://git.kernel.org/stable/c/711ebd961190def4c69ea24b2f0be75e995af24a (opens in a new tab)
- https://git.kernel.org/stable/c/482330f8261b4bea8146d9bd69c1199e5dfcbb5c (opens in a new tab)
- https://git.kernel.org/stable/c/05814c389b53d2f3a0b9eeb90ba7a05ba77c4c2a (opens in a new tab)
- https://git.kernel.org/stable/c/eb76d0f5553575599561010f24c277cc5b31d003 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-203784 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2025-68296)Record last updated .