Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:PCI/ASPM: Fix link state exit during switch upstream function removalBefore 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal toavoid use-after-free"), we would free the ASPM link only after the lastfunction on the bus pertaining to the given link was removed.That was too late. If function 0 is removed before sibling function,link->downstream would point to free'd memory after.After above change, we freed the ASPM parent link state upon any functionremoval on the bus pertaining to a given link.That is too early. If the link is to a PCIe switch with MFD on the upstreamport, then removing functions other than 0 first would free a link whichstill remains parent_link to the remaining downstream ports.The resulting GPFs are especially frequent during hot-unplug, becausepciehp removes devices on the link bus in reverse order.On that switch, function 0 is the virtual P2P bridge to the internal bus.Free exactly when function 0 is removed -- before the parent link isobsolete, but after all subordinate links are gone.[kwilczynski: commit log]
No PoCs from references.
- https://github.com/ARPSyndicate/cve-scores