title: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds
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.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 9954bf92c0cd, lessThan: 96fa26b74cdc, status: affected, versionType: git
version: 9954bf92c0cd, lessThan: 2f3380121d49, status: affected, versionType: git
version: 9954bf92c0cd, lessThan: 3d0163821c03, status: affected, versionType: git
version: 9954bf92c0cd, lessThan: c09f11ef3595, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.6, status: affected
version: 0, lessThan: 5.6, status: unaffected, versionType: custom
version: 5.10.36, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.11.20, lessThanOrEqual: 5.11.*, status: unaffected, versionType: custom
version: 5.12.3, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
