5.5

CVE-2023-53250

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

firmware: dmi-sysfs: Fix null-ptr-deref in dmi_sysfs_register_handle

KASAN reported a null-ptr-deref error:

KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 1373 Comm: modprobe
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
RIP: 0010:dmi_sysfs_entry_release
...
Call Trace:
 <TASK>
 kobject_put
 dmi_sysfs_register_handle (drivers/firmware/dmi-sysfs.c:540) dmi_sysfs
 dmi_decode_table (drivers/firmware/dmi_scan.c:133)
 dmi_walk (drivers/firmware/dmi_scan.c:1115)
 dmi_sysfs_init (drivers/firmware/dmi-sysfs.c:149) dmi_sysfs
 do_one_initcall (init/main.c:1296)
 ...
Kernel panic - not syncing: Fatal exception
Kernel Offset: 0x4000000 from 0xffffffff81000000
---[ end Kernel panic - not syncing: Fatal exception ]---

It is because previous patch added kobject_put() to release the memory
which will call  dmi_sysfs_entry_release() and list_del().

However, list_add_tail(entry->list) is called after the error block,
so the list_head is uninitialized and cannot be deleted.

Move error handling to after list_add_tail to fix this.
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Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.9.318 < 4.10
Linux ≫ Linux Kernel Version >= 4.14.283 < 4.15
Linux ≫ Linux Kernel Version >= 4.19.247 < 4.20
Linux ≫ Linux Kernel Version >= 5.4.198 < 5.5
Linux ≫ Linux Kernel Version >= 5.10.122 < 5.11
Linux ≫ Linux Kernel Version >= 5.15.47 < 5.15.99
Linux ≫ Linux Kernel Version >= 5.17.15 < 5.18
Linux ≫ Linux Kernel Version >= 5.18.4 < 6.1.16
Linux ≫ Linux Kernel Version >= 6.2 < 6.2.3
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.033
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.