Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.6.0, < 5.10.36 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897Patch
- https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8Patch
- https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2Patch
- https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59Patch
- https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897Patch
- https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8Patch
- https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2Patch
- https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59Patch
FAQ
What is CVE-2021-46952?
CVE-2021-46952 is a vulnerability with a CVSS score of 7.1 (HIGH). In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is ca...
How severe is CVE-2021-46952?
CVE-2021-46952 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-46952?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.