CVE-2022-48827
NFSD: Fix the behavior of READ near OFFSET_MAX
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.62% · top 50% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1726a39b0879acfb490b22dca643f26f4f907da9
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c6eff5c4277146a78b4fb8c9b668dd64542c41b0
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 44502aca8e02ab32d6b0eb52e006a5ec9402719b
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.220 – ≤ 5.10.*
- unaffected 5.15.24 – ≤ 5.15.*
- unaffected 5.16.10 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References (6)
- https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960 (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-48827)Record last updated .