CVE-2021-47631

Summary

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

ARM: davinci: da850-evm: Avoid NULL pointer dereference

With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:

Unable to handle kernel NULL pointer dereference at virtual address 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0

The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall().

Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < c06f476e5b74bcabb8c4a2fba55864a37e62843baffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < a12b356d45cbb6e8a1b718d1436b3d6239a862f3affected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < c64e2ed5cc376e137e572babfd2edc38b2cfb61baffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < 89931d4762572aaee6edbe5673d41f8082de110faffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < 0a312ec66a03133d28570f07bc52749ccfef54daaffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < 0940795c6834fbe7705acc5c3d4b2f7a5f67527aaffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < c5628533a3ece64235d04fe11ec44d2be99e423daffected
LinuxLinuxbae105879f2f2404155da6f50b3636193d228a62 < 83a1cde5c74bfb44b49cb2a940d044bb2380f4eaaffected
LinuxLinux2.6.33affected
LinuxLinux0 < 2.6.33unaffected
LinuxLinux4.9.311 <= 4.9.*unaffected
LinuxLinux4.14.276 <= 4.14.*unaffected
LinuxLinux4.19.239 <= 4.19.*unaffected
LinuxLinux5.4.190 <= 5.4.*unaffected
LinuxLinux5.10.112 <= 5.10.*unaffected
LinuxLinux5.15.35 <= 5.15.*unaffected
LinuxLinux5.17.4 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References