Linux kernel UAF in fbdev mode database handling
CVE-2026-64245 Published on July 24, 2026
fbdev: modedb: fix a possible UAF in fb_find_mode()
In the Linux kernel, the following vulnerability has been resolved:
fbdev: modedb: fix a possible UAF in fb_find_mode()
If mode_option is NULL, it is assigned from mode_option_buf:
if (!mode_option) {
fb_get_options(NULL, &mode_option_buf);
mode_option = mode_option_buf;
}
Later, name is assigned from mode_option:
const char *name = mode_option;
However, mode_option_buf is freed before name is no longer used:
kfree(mode_option_buf);
while name is still accessed by:
if ((name_matches(db[i], name, namelen) ||
Since name aliases mode_option_buf, this may result in a
use-after-free.
Fix this by extending the lifetime of mode_option_buf until the end of the
function by using scope-based resource management for cleanup.
Products Associated with CVE-2026-64245
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c7dc382439f7b019e207055b52e9cec051d42fa9 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f906347d75c7fc377041c6d3c535d0f08846aada is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4d418cf8daf57e454b4d855bf9b2419fd8e6a540 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 13b6f0cdd5cd5e60f682ec43134ab0e2024bd356 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 85b6256469cebdac395e7447147e06b2e151014f is affected.
- Before 6.6.144 is affected.
- Before 6.12.95 is affected.
- Before 6.18.38 is affected.
- Before 7.1.3 is affected.
- Version 6.6.144, <= 6.6.* is unaffected.
- Version 6.12.95, <= 6.12.* is unaffected.
- Version 6.18.38, <= 6.18.* is unaffected.
- Version 7.1.3, <= 7.1.* is unaffected.
- Version 7.2-rc1, <= * is unaffected.