Description

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

scsi: target: core: Fix null-ptr-deref in target_alloc_device()

There is a null-ptr-deref issue reported by KASAN:

BUG: KASAN: null-ptr-deref in target_alloc_device+0xbc4/0xbe0 [target_core_mod]
...
kasan_report+0xb9/0xf0
target_alloc_device+0xbc4/0xbe0 [target_core_mod]
core_dev_setup_virtual_lun0+0xef/0x1f0 [target_core_mod]
target_core_init_configfs+0x205/0x420 [target_core_mod]
do_one_initcall+0xdd/0x4e0
...
entry_SYSCALL_64_after_hwframe+0x76/0x7e

In target_alloc_device(), if allocing memory for dev queues fails, then
dev will be freed by dev->transport->free_device(), but dev->transport
is not initialized at that time, which will lead to a null pointer
reference problem.

Fixing this bug by freeing dev with hba->backend->ops->free_device().

Classification

CVE ID: CVE-2024-50153

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.5

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 2.14% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2024-50153
https://git.kernel.org/stable/c/8c1e6717f60d31f8af3937c23c4f1498529584e1
https://git.kernel.org/stable/c/39e02fa90323243187c91bb3e8f2f5f6a9aacfc7
https://git.kernel.org/stable/c/895ab729425ef9bf3b6d2f8d0853abe64896f314
https://git.kernel.org/stable/c/b80e9bc85bd9af378e7eac83e15dd129557bbdb6
https://git.kernel.org/stable/c/14a6a2adb440e4ae97bee73b2360946bd033dadd
https://git.kernel.org/stable/c/fca6caeb4a61d240f031914413fcc69534f6dc03

Timeline