Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: arm64: set UXN on swapper page tables [ This issue was fixed upstream by accident in c3cee924bd85 ("arm64: head: cover entire kernel image in initial ID map") as part of a large refactoring of the arm64 boot flow. This simple fix is therefore preferred for -stable backporting ] On a system that implements FEAT_EPAN, read/write access to the idmap is denied because UXN is not set on the swapper PTEs. As a result, idmap_kpti_install_ng_mappings panics the kernel when accessing __idmap_kpti_flag. Fix it by setting UXN on these PTEs.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 18107f8a2df6bf1c6cac8d0713f757f866d5af51 before 775871d4be0d75e219cca937af843a4a1b60489a; affected 18107f8a2df6bf1c6cac8d0713f757f866d5af51 before c3cee924bd855184d15bc4aa6088dcf8e2c1394c |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.60 through 5.15.*; unaffected 6.0 through * |
CWE
No CWE identifiers supplied.