CVE-2024-57874

/// Technical description

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

arm64: ptrace: fix partial SETREGSET for NT_ARM_TAGGED_ADDR_CTRL

Currently tagged_addr_ctrl_set() doesn't initialize the temporary 'ctrl'

variable, and a SETREGSET call with a length of zero will leave this

uninitialized. Consequently tagged_addr_ctrl_set() will consume an

arbitrary value, potentially leaking up to 64 bits of memory from the

kernel stack. The read is limited to a specific slot on the stack, and

the issue does not provide a write mechanism.

As set_tagged_addr_ctrl() only accepts values where bits [63:4] zero and

rejects other values, a partial SETREGSET attempt will randomly succeed

or fail depending on the value of the uninitialized value, and the

exposure is significantly limited.

Fix this by initializing the temporary value before copying the regset

from userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG,

NT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing

value of th

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References