KVM: s390: pci: Validate AIBV and AISB before pinning guest pages
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
KVM: s390: pci: Validate AIBV and AISB before pinning guest pages
The AIBV holds one bit per MSI-X vector for a given function. The size of
the bit vector is derived from the NOI and the AIBVO. If the size of the
AIBV exceeds a single page boundary, then reject the request as we cannot
safely pin the guest AIBV.
Similarly reject the request if the AISB address is not 8-byte aligned as
the architecture requires doubleword alignment for the summary bit address.
Since the AISBO can address up to 64 bits, the size of the AISB can only be
8 bytes for the function. This also ensures the AISB doesn't exceed a
single page boundary.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47https://git.kernel.org/stable/c/3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48https://git.kernel.org/stable/c/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01https://git.kernel.org/stable/c/b878ba7e28144c9a857bc847d31f3c45413450achttps://git.kernel.org/stable/c/f00ef8efd41440129ccd88f4a1ebebf8d61d297fhttps://git.kernel.org/stable/c/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528