CVE-2026-23346

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

arm64: io: Extract user memory type in ioremap_prot()

The only caller of ioremap_prot() outside of the generic ioremap()

implementation is generic_access_phys(), which passes a 'pgprot_t' value

determined from the user mapping of the target 'pfn' being accessed by

the kernel. On arm64, the 'pgprot_t' contains all of the non-address

bits from the pte, including the permission controls, and so we end up

returning a new user mapping from ioremap_prot() which faults when

accessed from the kernel on systems with PAN:

| Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000

| ...

| Call trace:

| __memcpy_fromio+0x80/0xf8

| generic_access_phys+0x20c/0x2b8

| __access_remote_vm+0x46c/0x5b8

| access_remote_vm+0x18/0x30

| environ_read+0x238/0x3e8

| vfs_read+0xe4/0x2b0

| ksys_read+0xcc/0x178

| __arm64_sys_read+0x4c/0x68

Extract only the memory type from the

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References