netfilter: reject zero shift in nft_bitwise
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.1%
exploitation probability
0.1%top 98% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
netfilter: reject zero shift in nft_bitwise
Reject zero shift operands for nft_bitwise left and right shift
expressions during initialization.
The carry propagation logic computes the carry from the adjacent 32-bit
word using BITS_PER_TYPE(u32) - shift. A zero shift operand turns this
into a 32-bit shift, which is undefined behaviour.
Reject zero shift operands in the control plane, alongside the existing
check for values greater than or equal to 32, so malformed rules never
reach the packet path.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dchttps://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47bhttps://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07