CVE-2023-53686

/// Technical description

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

net/handshake: fix null-ptr-deref in handshake_nl_done_doit()

We should not call trace_handshake_cmd_done_err() if socket lookup has failed.

Also we should call trace_handshake_cmd_done_err() before releasing the file,

otherwise dereferencing sock->sk can return garbage.

This also reverts 7afc6d0a107f ("net/handshake: Fix uninitialized local variable")

Unable to handle kernel paging request at virtual address dfff800000000003

KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]

Mem abort info:

ESR = 0x0000000096000005

EC = 0x25: DABT (current EL), IL = 32 bits

SET = 0, FnV = 0

EA = 0, S1PTW = 0

FSC = 0x05: level 1 translation fault

Data abort info:

ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000

CM = 0, WnR = 0, TnD = 0, TagAccess = 0

GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0

[dfff800000000003] address between user and kernel address ranges

Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP

Mo

/// 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