Tracker / CVE-2026-63952
CVE-2026-63952
High 8.4
In the Linux kernel, the following vulnerability has been resolved: memfd: deny writeable mappings when implying SEAL_WRITE When SEAL_EXEC is added, SEAL_WRITE is implied to make W^X. But the implied seal is set after the check that makes sure the memfd can not have any writable mappings. This means one can use SEAL_EXEC to apply SEAL_WRITE while having writeable mappings. This breaks the contract that SEAL_WRITE provides and can be used by an attacker to pass a memfd that appears to be write sealed but can still be modified arbitrarily. Fix this by adding the implied seals before the call for mapping_deny_writable() is done.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 6.13 → 6.18.35 |
| linux | linux_kernel · 6.19 → 7.0.12 |
| linux | linux_kernel · 6.3 → 6.6.143 |
| linux | linux_kernel · 6.7 → 6.12.93 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.