CVE-2024-46715

/// Technical description

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

driver: iio: add missing checks on iio_info's callback access

Some callbacks from iio_info structure are accessed without any check, so

if a driver doesn't implement them trying to access the corresponding

sysfs entries produce a kernel oops such as:

[ 2203.527791] Unable to handle kernel NULL pointer dereference at virtual address 00000000 when execute

[...]

[ 2203.783416] Call trace:

[ 2203.783429] iio_read_channel_info_avail from dev_attr_show+0x18/0x48

[ 2203.789807] dev_attr_show from sysfs_kf_seq_show+0x90/0x120

[ 2203.794181] sysfs_kf_seq_show from seq_read_iter+0xd0/0x4e4

[ 2203.798555] seq_read_iter from vfs_read+0x238/0x2a0

[ 2203.802236] vfs_read from ksys_read+0xa4/0xd4

[ 2203.805385] ksys_read from ret_fast_syscall+0x0/0x54

[ 2203.809135] Exception stack(0xe0badfa8 to 0xe0badff0)

[ 2203.812880] dfa0: 00000003 b6f10f80 00000003 b6eab000 00020000 00000000

[ 2203.819746] dfc0: 00000

/// 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