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ubuntucveUbuntu.comUB:CVE-2024-35900
HistoryMay 19, 2024 - 12:00 a.m.

CVE-2024-35900

2024-05-1900:00:00
ubuntu.com
ubuntu.com
3
linux kernel
vulnerability
netfilter nf_tables
security
cve-2024-35900
chains
table flags
dormant flag

6.6 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%

In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: reject new basechain after table flag update When
dormant flag is toggled, hooks are disabled in the commit phase by
iterating over current chains in table (existing and new). The following
configuration allows for an inconsistent state: add table x add chain x y {
type filter hook input priority 0; } add table x { flags dormant; } add
chain x w { type filter hook input priority 1; } which triggers the
following warning when trying to unregister chain w which is already
unregistered. [ 127.322252] WARNING: CPU: 7 PID: 1211 at
net/netfilter/core.c:50 1 __nf_unregister_net_hook+0x21a/0x260 […] [
127.322519] Call Trace: [ 127.322521] <TASK> [ 127.322524] ?
__warn+0x9f/0x1a0 [ 127.322531] ? __nf_unregister_net_hook+0x21a/0x260 [
127.322537] ? report_bug+0x1b1/0x1e0 [ 127.322545] ? handle_bug+0x3c/0x70 [
127.322552] ? exc_invalid_op+0x17/0x40 [ 127.322556] ?
asm_exc_invalid_op+0x1a/0x20 [ 127.322563] ? kasan_save_free_info+0x3b/0x60
[ 127.322570] ? __nf_unregister_net_hook+0x6a/0x260 [ 127.322577] ?
__nf_unregister_net_hook+0x21a/0x260 [ 127.322583] ?
__nf_unregister_net_hook+0x6a/0x260 [ 127.322590] ?
__nf_tables_unregister_hook+0x8a/0xe0 [nf_tables] [ 127.322655]
nft_table_disable+0x75/0xf0 [nf_tables] [ 127.322717]
nf_tables_commit+0x2571/0x2620 [nf_tables]

6.6 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%