CVE-2024-38580

Summary

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

epoll: be better about file lifetimes

epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless.

Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbfd1088e24ec4c1199756a37cb8e4cd0a4b016eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 559214eb4e5c3d05e69428af2fae2691ba1eb784affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4f65f4defe4e23659275ce5153541cd4f76ce2d2affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 16e3182f6322575eb7c12e728ad3c7986a189d5daffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4efaa5acf0a1d2b5947f98abb3acf8bfd966422baffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.15.161 <= 5.15.*unaffected
LinuxLinux6.1.93 <= 6.1.*unaffected
LinuxLinux6.6.33 <= 6.6.*unaffected
LinuxLinux6.8.12 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References