CVE-2026-23056

Summary

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

uacce: implement mremap in uacce_vm_ops to return -EPERM

The current uacce_vm_ops does not support the mremap operation of vm_operations_struct. Implement .mremap to return -EPERM to remind users.

The reason we need to explicitly disable mremap is that when the driver does not implement .mremap, it uses the default mremap method. This could lead to a risk scenario:

An application might first mmap address p1, then mremap to p2, followed by munmap(p1), and finally munmap(p2). Since the default mremap copies the original vma's vm_private_data (i.e., q) to the new vma, both munmap operations would trigger vma_close, causing q->qfr to be freed twice(qfr will be set to null here, so repeated release is ok).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < 78d99f062d42e3af2ca46bde1a8e46e0dfd372e3affected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < ebfa85658a39b49ec3901ceea7535b73aa0429e6affected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < 75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06faffected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < 4c042bc71474dbe417c268f4bfb8ec196f802f07affected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < a407ddd61b3e6afc5ccfcd1478797171cf5686eeaffected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < ba29b59d124e725e0377f09b2044909c91d657a1affected
LinuxLinux015d239ac0142ad0e26567fd890ef8d171f13709 < 02695347be532b628f22488300d40c4eba48b9b7affected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.249 <= 5.10.*unaffected
LinuxLinux5.15.199 <= 5.15.*unaffected
LinuxLinux6.1.162 <= 6.1.*unaffected
LinuxLinux6.6.122 <= 6.6.*unaffected
LinuxLinux6.12.68 <= 6.12.*unaffected
LinuxLinux6.18.8 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References