CVE-2021-46952
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().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.28% probability · 21th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.