CVE-2022-48827 NFSD: Fix the behavior of READ near OFFSET_MAX
An integer overflow in the Linux kernel NFS server causes a denial of service when reading near the maximum file offset, leading to infinite client retries.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-48827?
CVE-2022-48827 is a high-severity vulnerability in Linux kernel, published on 16 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
NFSD: Fix the behavior of READ near OFFSET_MAX
Dan Aloni reports: > Due to commit 8cfb9015280d ("NFS: Always provide aligned buffers to > the RPC read layers") on the client, a read of 0xfff is aligned up > to server rsize of 0x1000. > > As a result, in a test where the server has a file of size > 0x7fffffffffffffff, and the client tries to read from the offset > 0x7ffffffffffff000, the read causes loff_t overflow in the server > and it returns an NFS code of EINVAL to the client. The client as > a result indefinitely retries the request.
The Linux NFS client does not handle NFS?ERR_INVAL, even though all NFS specifications permit servers to return that status code for a READ.
Instead of NFS?ERR_INVAL, have out-of-range READ requests succeed and return a short result. Set the EOF flag in the result to prevent the client from retrying the READ request. This behavior appears to be consistent with Solaris NFS servers.
Note that NFSv3 and NFSv4 use u64 offset values on the wire. These must be converted to loff_t internally before use -- an implicit type cast is not adequate for this purpose. Otherwise VFS checks against sb->s_maxbytes do not work properly.
Weakness: CWE-125
Which versions are affected by CVE-2022-48827?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48827?
Apply the vendor's patch.
Is CVE-2022-48827 being exploited?
There is no known exploitation of CVE-2022-48827 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48827, GHSA-g43c-r7c6-fhrv, UBUNTU-CVE-2022-48827.