CVE-2024-35882

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 < 1ba1291172f935e6b6fe703161a948f3347400b8affected
LinuxLinuxe18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 < a2ebedf7bcd17a1194a0a18122c885eb578ee882affected
LinuxLinuxe18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 < 05258a0a69b3c5d2c003f818702c0a52b6fea861affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.26 <= 6.6.*unaffected
LinuxLinux6.8.5 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References