cbcvebase.
CVE-2024-50130
published 2024-11-05

CVE-2024-50130: 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…

PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.23%
13.8th percentile
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

14 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.11.6-1 (forky)linux 6.11.6-1 (forky)
linuxlinux
linuxlinux>= 84601d6ee68ae820dec97450934797046d62db4b < f41bd93b3e0508edc7ba820357f949071dcc0accf41bd93b3e0508edc7ba820357f949071dcc0acc
linuxlinux>= 84601d6ee68ae820dec97450934797046d62db4b < d0d7939543a1b3bb93af9a18d258a774daf8f162d0d7939543a1b3bb93af9a18d258a774daf8f162
linuxlinux>= 84601d6ee68ae820dec97450934797046d62db4b < 1230fe7ad3974f7bf6c78901473e039b34d4fb1f1230fe7ad3974f7bf6c78901473e039b34d4fb1f
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.11.6-16.11.6-1
linuxlinux_kernel>= 0 < 6.11.6-16.11.6-1
linuxlinux_kernel>= 0 < 6.8.0-58.606.8.0-58.60
linuxlinux_kernel>= 0 < 6.11.0-18.186.11.0-18.18
linuxlinux_kernel>= 6.4 < 6.6.596.6.59
linuxlinux_kernel>= 6.7 < 6.11.66.11.6
msrcazl3_kernel_6.6.57.1-7_on_azure_linux_3.0
msrcazl3_kernel_6.6.64.2-1_on_azure_linux_3.0

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.8LOW
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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