CVE-2023-52449

Summary

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

mtd: Fix gluebi NULL pointer dereference caused by ftl notifier

If both ftl.ko and gluebi.ko are loaded, the notifier of ftl triggers NULL pointer dereference when trying to access ‘gluebi->desc’ in gluebi_read().

ubi_gluebi_init ubi_register_volume_notifier ubi_enumerate_volumes ubi_notify_all gluebi_notify nb->notifier_call() gluebi_create mtd_device_register mtd_device_parse_register add_mtd_device blktrans_notify_add not->add() ftl_add_mtd tr->add_mtd() scan_header mtd_read mtd_read_oob mtd_read_oob_std gluebi_read mtd->read() gluebi->desc - NULL

Detailed reproduction information available at the Link [1],

In the normal case, obtain gluebi->desc in the gluebi_get_device(), and access gluebi->desc in the gluebi_read(). However, gluebi_get_device() is not executed in advance in the ftl_add_mtd() process, which leads to NULL pointer dereference.

The solution for the gluebi module is to run jffs2 on the UBI volume without considering working with ftl or mtdblock [2]. Therefore, this problem can be avoided by preventing gluebi from creating the mtdblock device after creating mtd partition of the type MTD_UBIVOLUME.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < aeba358bcc8ffddf9b4a9bd0e5ec9eb338d46022affected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < 1bf4fe14e97cda621522eb2f28b0a4e87c5b0745affected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < 001a3f59d8c914ef8273461d4bf495df384cc5f8affected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < d8ac2537763b54d278b80b2b080e1652523c7d4caffected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < 5389407bba1eab1266c6d83e226fb0840cb98dd5affected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < cfd7c9d260dc0a3baaea05a122a19ab91e193c65affected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < b36aaa64d58aaa2f2cbc8275e89bae76a2b6c3dcaffected
LinuxLinux2ba3d76a1e29f2ba64fbc762875cf9fb2d4ba2ba < a43bdc376deab5fff1ceb93dca55bcab8dbdc1d6affected
LinuxLinux2.6.31affected
LinuxLinux0 < 2.6.31unaffected
LinuxLinux4.19.306 <= 4.19.*unaffected
LinuxLinux5.4.268 <= 5.4.*unaffected
LinuxLinux5.10.209 <= 5.10.*unaffected
LinuxLinux5.15.148 <= 5.15.*unaffected
LinuxLinux6.1.75 <= 6.1.*unaffected
LinuxLinux6.6.14 <= 6.6.*unaffected
LinuxLinux6.7.2 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References