CVE-2023-53250

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfdffa4ad8f6bf1ece877edfb807f2b2c729d8578 < b4fe158259fb5fead52ff2b55841ec5c39492604affected
LinuxLinux660ba678f9998aca6db74f2dd912fa5124f0fa31 < e851996b32264e78a10863c2ac41a8689d7b9252affected
LinuxLinux660ba678f9998aca6db74f2dd912fa5124f0fa31 < 5d0492d1d934642bdfd2057acc1b56f4b57be465affected
LinuxLinux660ba678f9998aca6db74f2dd912fa5124f0fa31 < 18e126e97c961f7a93823795c879d7c085fe5098affected
LinuxLinuxa9bfb37d6ba7c376b0d53337a4c5f5ff324bd725affected
LinuxLinuxed38d04342dfbe9e5aca745c8b5eb4188a74f0efaffected
LinuxLinuxc66cc3c62870a27ea8f060a7e4c1ad8d26dd3f0daffected
LinuxLinuxa724634b2a49f6ff0177a9e19a5a92fc1545e1b7affected
LinuxLinux985706bd3bbeffc8737bc05965ca8d24837bc7dbaffected
LinuxLinux3ba359ebe914ac3f8c6c832b28007c14c39d3766affected
LinuxLinuxec752973aa721ee281d5441e497364637c626c7baffected
LinuxLinux5.15.47 < 5.15.99affected
LinuxLinux4.9.318 < 4.10affected
LinuxLinux4.14.283 < 4.15affected
LinuxLinux4.19.247 < 4.20affected
LinuxLinux5.4.198 < 5.5affected
LinuxLinux5.10.122 < 5.11affected
LinuxLinux5.17.15 < 5.18affected
LinuxLinux5.18.4 < 5.19affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux5.15.99 <= 5.15.*unaffected
LinuxLinux6.1.16 <= 6.1.*unaffected
LinuxLinux6.2.3 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References