CVE-2024-41012

Summary

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

filelock: Remove locks reliably when fcntl/close race is detected

When fcntl_setlk() races with close(), it removes the created lock with do_lock_file_wait(). However, LSMs can allow the first do_lock_file_wait() that created the lock while denying the second do_lock_file_wait() that tries to remove the lock. Separately, posix_lock_file() could also fail to remove a lock due to GFP_KERNEL allocation failure (when splitting a range in the middle).

After the bug has been triggered, use-after-free reads will occur in lock_get_status() when userspace reads /proc/locks. This can likely be used to read arbitrary kernel memory, but can't corrupt kernel memory.

Fix it by calling locks_remove_posix() instead, which is designed to reliably get rid of POSIX locks associated with the given file and files_struct and is also used by filp_flush().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < d30ff33040834c3b9eee29740acd92f9c7ba2250affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < dc2ce1dfceaa0767211a9d963ddb029ab21c4235affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < 5661b9c7ec189406c2dde00837aaa4672efb6240affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < 52c87ab18c76c14d7209646ccb3283b3f5d87b22affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < ef8fc41cd6f95f9a4a3470f085aecf350569a0b3affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < 5f5d0799eb0a01d550c21b7894e26b2d9db55763affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < b6d223942c34057fdfd8f149e763fa823731b224affected
LinuxLinuxc293621bbf678a3d85e3ed721c3921c8a670610d < 3cad1bc010416c6dd780643476bc59ed742436b9affected
LinuxLinux2.6.13affected
LinuxLinux0 < 2.6.13unaffected
LinuxLinux4.19.319 <= 4.19.*unaffected
LinuxLinux5.4.281 <= 5.4.*unaffected
LinuxLinux5.10.223 <= 5.10.*unaffected
LinuxLinux5.15.164 <= 5.15.*unaffected
LinuxLinux6.1.101 <= 6.1.*unaffected
LinuxLinux6.6.42 <= 6.6.*unaffected
LinuxLinux6.9.9 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References