CVE-2021-47240

Summary

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

net: qrtr: fix OOB Read in qrtr_endpoint_post

Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong size type:

if (len != ALIGN(size, 4) + hdrlen)
	goto err;

If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and

skb_put_data(skb, data + hdrlen, size);

will read out of bound from data, which is hdrlen allocated block.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux194ccc88297ae78d0803adad83c6dcc369787c9e < f8111c0d7ed42ede41a3d0d393b104de0730a8a6affected
LinuxLinux194ccc88297ae78d0803adad83c6dcc369787c9e < 26b8d10703a9be45d6097946b2b4011f7dd2c56faffected
LinuxLinux194ccc88297ae78d0803adad83c6dcc369787c9e < 960b08dd36de1e341e3eb43d1c547513e338f4f8affected
LinuxLinux194ccc88297ae78d0803adad83c6dcc369787c9e < 19892ab9c9d838e2e5a7744d36e4bb8b7c3292feaffected
LinuxLinux194ccc88297ae78d0803adad83c6dcc369787c9e < ad9d24c9429e2159d1e279dc3a83191ccb4daf1daffected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux4.19.196 <= 4.19.*unaffected
LinuxLinux5.4.128 <= 5.4.*unaffected
LinuxLinux5.10.46 <= 5.10.*unaffected
LinuxLinux5.12.13 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References