CVE-2026-63826: Linux kernel · fbdev: fix use-after-free in store_modes()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c6765f39ed27014ff877b00a2efa494233404e17 : patch Linux kernel soon.
Data as of 30 Oct 2026, 13:33 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in c6765f39ed27014ff877b00a2efa494233404e17, 3047319e44f1368370f6fa2c04dea2961fb10215, 5267eab88fa4c684459504b8be577ad64953b9a6 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
A fix has been implemented in the Linux kernel source code, clearing stale pointers before freeing the mode list in store_modes(). Users and administrators should update to a Linux kernel version that includes the fix identified by the commits c6765f39ed27014ff877b00a2efa494233404e17 and others listed. No additional mitigation is required beyond applying the official patch.
Description
A use-after-free vulnerability was identified and fixed in the Linux kernel's framebuffer device (fbdev) subsystem, specifically in the store_modes() function. The issue arises because pointers to freed mode lists remain stale and are dereferenced later, leading to use-after-free reads. The fix involves clearing these pointers before freeing the old mode list to prevent invalid memory access.
References
- git.kernel.org/stable/c/3047319e44f1368370f6fa2c04dea2961fb10215 (opens in a new tab)
- git.kernel.org/stable/c/5267eab88fa4c684459504b8be577ad64953b9a6 (opens in a new tab)
- git.kernel.org/stable/c/c6765f39ed27014ff877b00a2efa494233404e17 (opens in a new tab)
- git.kernel.org/stable/c/0d35f9f194a858567a21017d69318a51e3a822b9 (opens in a new tab)
- git.kernel.org/stable/c/70f1e000b88cfa8ca3fd7f4d082647fc089a7769 (opens in a new tab)
- git.kernel.org/stable/c/2c1c805c65fb7dc7524e20376d6987721e73a0b1 (opens in a new tab)