CVE-2021-47507
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47507
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47507.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47507
- Downstream
- Related
- Published
- 2024-05-24T15:15:11Z
- Modified
- 2025-09-24T19:17:55Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
nfsd: Fix nsfd startup race (again)
Commit bd5ae9288d64 ("nfsd: register pernet ops last, unregister first") has re-opened rpcpipefsevent() race against nfsdnetid registration (registerpernetsubsys()) which has been fixed by commit bb7ffbf29e76 ("nfsd: fix nsfd startup race triggering BUG_ON").
Restore the order of registerpernetsubsys() vs registercldnotifier(). Add WARN_ON() to prevent a future regression.
Crash info: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012 CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1 pc : rpcpipefsevent+0x54/0x120 [nfsd] lr : rpcpipefsevent+0x48/0x120 [nfsd] Call trace: rpcpipefsevent+0x54/0x120 [nfsd] blockingnotifiercallchain rpcfillsuper gettreekeyed rpcfsgettree vfsgettree domount ksysmount _arm64sysmount el0svchandler el0svc
- References