netfilter: xt_u32: reject invalid shift counts
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xt_u32: reject invalid shift counts
u32_match_it() executes rule-supplied shift operands on a 32-bit
value. A malformed u32 rule can provide a shift count of 32 or more,
triggering an undefined shift out-of-bounds during packet evaluation.
Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in
u32_mt_checkentry() and reject malformed rules before they reach the
packet path.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000ahttps://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268