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CVE-2024-58093

PCI/ASPM: Fix link state exit during switch upstream function removal

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.292, 5.10.236, 5.15.180, 6.1.134, 6.4, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Fix link state exit during switch upstream function removal Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free"), we would free the ASPM link only after the last function 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 function removal on the bus pertaining to a given link. That is too early. If the link is to a PCIe switch with MFD on the upstream port, then removing functions other than 0 first would free a link which still remains parent_link to the remaining downstream ports. The resulting GPFs are especially frequent during hot-unplug, because pciehp 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 Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone. [kwilczynski: commit log]

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5.4.251 · fixed in 5.4.292; From 5.10.188 · fixed in 5.10.236; From 5.15.121 · fixed in 5.15.180; From 6.1.39 · fixed in 6.1.134; From 6.3.13 · fixed in 6.4; From 6.4.4 · fixed in 6.5

  • Linux Linux

    6.5

References 9

git.kernel.org