CVE-2023-53167

/// Technical description

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

tracing: Fix null pointer dereference in tracing_err_log_open()

Fix an issue in function 'tracing_err_log_open'.

The function doesn't call 'seq_open' if the file is opened only with

write permissions, which results in 'file->private_data' being left as null.

If we then use 'lseek' on that opened file, 'seq_lseek' dereferences

'file->private_data' in 'mutex_lock(&m->lock)', resulting in a kernel panic.

Writing to this node requires root privileges, therefore this bug

has very little security impact.

Tracefs node: /sys/kernel/tracing/error_log

Example Kernel panic:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038

Call trace:

mutex_lock+0x30/0x110

seq_lseek+0x34/0xb8

__arm64_sys_lseek+0x6c/0xb8

invoke_syscall+0x58/0x13c

el0_svc_common+0xc4/0x10c

do_el0_svc+0x24/0x98

el0_svc+0x24/0x88

el0t_64_sync_handler+0x84/0xe4

el0t_64_sync+0x1b4/0x1b8

Code: d503201f aa0803e0 aa1f03e1 a

/// 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