CVE-2021-47652

Summary

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

video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()

I got a null-ptr-deref report:

BUG: kernel NULL pointer dereference, address: 0000000000000000 … RIP: 0010:fb_destroy_modelist+0x38/0x100 … Call Trace: ufx_usb_probe.cold+0x2b5/0xac1 [smscufx] usb_probe_interface+0x1aa/0x3c0 [usbcore] really_probe+0x167/0x460 … ret_from_fork+0x1f/0x30

If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will be called to destroy modelist in the error handling path. But modelist has not been initialized yet, so it will result in null-ptr-deref.

Initialize modelist before calling fb_alloc_cmap() to fix this bug.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < d1b6a1f0c23b7164250479bf92e2893291dca539affected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < 0fd28daec73525382e5c992db8743bf76e42cd5caffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4baffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < da8b269cc0a2526ebeaccbe2484c999eb0f822cfaffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < 64ec3e678d76419f207b9cdd338dda438ca10b1caffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < c420b540db4b5d69de0a36d8b9d9a6a79a04f05aaffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < d396c651e2b508b6179bb678cc029f3becbf5170affected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < 9280ef235b05e8f19f8bc6d547b992f0a0ef398daffected
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5 < 1791f487f877a9e83d81c8677bd3e7b259e7cb27affected
LinuxLinux3.2affected
LinuxLinux0 < 3.2unaffected
LinuxLinux4.9.311 <= 4.9.*unaffected
LinuxLinux4.14.276 <= 4.14.*unaffected
LinuxLinux4.19.238 <= 4.19.*unaffected
LinuxLinux5.4.189 <= 5.4.*unaffected
LinuxLinux5.10.110 <= 5.10.*unaffected
LinuxLinux5.15.33 <= 5.15.*unaffected
LinuxLinux5.16.19 <= 5.16.*unaffected
LinuxLinux5.17.2 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References