CVE-2021-47179

Summary

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

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

Commit de144ff4234f changes _pnfs_return_layout() to call pnfs_mark_matching_lsegs_return() passing NULL as the struct pnfs_layout_range argument. Unfortunately, pnfs_mark_matching_lsegs_return() doesn't check if we have a value here before dereferencing it, causing an oops.

I'm able to hit this crash consistently when running connectathon basic tests on NFS v4.1/v4.2 against Ontap.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux80e34f4957ec3010c85f9bb0b568a8d46acdf535 < 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42affected
LinuxLinux7b7b9774643220e53eef58c15bb29bd4182fe053 < 42637ca25c7d7b5a92804a679af5192e8c1a9f48affected
LinuxLinux9ffa7967f9379a0a1b924e9ffeda709d72237da7 < 39785761feadf261bc5101372b0b0bbaf6a94494affected
LinuxLinux6be0e4b59314e4a836495f6ffdc5d2c5b079deeb < aba3c7795f51717ae316f3566442dee7cc3eeccbaffected
LinuxLinux2fafe7d5047f98791afd9a1d90d2afb70debc590 < f9890652185b72b8de9ebeb4406037640b6e1b53affected
LinuxLinux7e65ea887d0c0997f3053acd91a027af45e71c5b < b090d110e66636bca473fd8b98d5c97b555a965aaffected
LinuxLinuxde144ff4234f935bd2150108019b5d87a90a8a96 < a421d218603ffa822a0b8045055c03eae394a7ebaffected
LinuxLinux96260bde1ea8ae31a5402fe506abbb8951d5a42caffected
LinuxLinux5.11.20 < 5.12affected
LinuxLinux4.9.269 < 4.9.271affected
LinuxLinux4.14.233 < 4.14.235affected
LinuxLinux4.19.191 < 4.19.193affected
LinuxLinux5.4.118 < 5.4.124affected
LinuxLinux5.10.36 < 5.10.42affected
LinuxLinux5.12.3 < 5.12.9affected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References