Riskcovery

CVE-2024-35882

SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP

State
Published
Severity
7.5 High
Published
May 19, 2024
Updated
Aug 5, 2026
Reserved
May 17, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP

Jan Schunk reports that his small NFS servers suffer from memory exhaustion after just a few days. A bisect shows that commit e18e157bb5c8 ("SUNRPC: Send RPC message on TCP with a single sock_sendmsg() call") is the first bad commit.

That commit assumed that sock_sendmsg() releases all the pages in the underlying bio_vec array, but the reality is that it doesn't. svc_xprt_release() releases the rqst's response pages, but the record marker page fragment isn't one of those, so it is never released.

This is a narrow fix that can be applied to stable kernels. A more extensive fix is in the works.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 to before 1ba1291172f935e6b6fe703161a948f3347400b8Affected
  • e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 to before a2ebedf7bcd17a1194a0a18122c885eb578ee882Affected
  • e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 to before 05258a0a69b3c5d2c003f818702c0a52b6fea861Affected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.26 through 6.6.*Not affected
  • 6.8.5 through 6.8.*Not affected
  • 6.9 and laterNot affected

References

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