CVE-2021-47586

Summary

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

net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup

KASAN reports an out-of-bounds read in rk_gmac_setup on the line:

while (ops->regs[i]) {

This happens for most platforms since the regs flexible array member is empty, so the memory after the ops structure is being read here. It seems that mostly this happens to contain zero anyway, so we get lucky and everything still works.

To avoid adding redundant data to nearly all the ops structures, add a new flag to indicate whether the regs field is valid and avoid this loop when it is not.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3bb3d6b1c1957e88bfc5e77a4557f7e6ba761fe3 < 0b4a5d1e15ce72f69be48f38dc0401dab890ae0faffected
LinuxLinux3bb3d6b1c1957e88bfc5e77a4557f7e6ba761fe3 < 0546b224cc7717cc8a2db076b0bb069a9c430794affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.11 <= 5.15.*unaffected
LinuxLinux5.16 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References