CVE-2024-50130

Summary

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

netfilter: bpf: must hold reference on net namespace

BUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0 Read of size 8 at addr ffff8880106fe400 by task repro/72= bpf_nf_link_release+0xda/0x1e0 bpf_link_free+0x139/0x2d0 bpf_link_release+0x68/0x80 __fput+0x414/0xb60

Eric says: It seems that bpf was able to defer the __nf_unregister_net_hook() after exit()/close() time. Perhaps a netns reference is missing, because the netns has been dismantled/freed already. bpf_nf_link_attach() does : link->net = net; But I do not see a reference being taken on net.

Add such a reference and release it after hook unreg. Note that I was unable to get syzbot reproducer to work, so I do not know if this resolves this splat.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux84601d6ee68ae820dec97450934797046d62db4b < f41bd93b3e0508edc7ba820357f949071dcc0accaffected
LinuxLinux84601d6ee68ae820dec97450934797046d62db4b < d0d7939543a1b3bb93af9a18d258a774daf8f162affected
LinuxLinux84601d6ee68ae820dec97450934797046d62db4b < 1230fe7ad3974f7bf6c78901473e039b34d4fb1faffected
LinuxLinux6.4affected
LinuxLinux0 < 6.4unaffected
LinuxLinux6.6.59 <= 6.6.*unaffected
LinuxLinux6.11.6 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References