CVE-2024-40909

Summary

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

bpf: Fix a potential use-after-free in bpf_link_free()

After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux876941f533e7b47fc69977fc4551c02f2d18af97 < 91cff53136daeff50816b0baeafd38a6976f6209affected
LinuxLinux1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce < fa97b8fed9896f1e89cb657513e483a152d4c382affected
LinuxLinux1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce < 2884dc7d08d98a89d8d65121524bb7533183a63aaffected
LinuxLinux5d8d447777564b35f67000e7838e7ccb64d525c8affected
LinuxLinux6.6.26 < 6.6.35affected
LinuxLinux6.8.5 < 6.9affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.6.35 <= 6.6.*unaffected
LinuxLinux6.9.6 <= 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