Description (CNA)
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 Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone.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]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f before 0a0f9aecf66b98959aab7fb5764b4b3e522f4f5b; affected 7badf4d6f49a358a01ab072bbff88d3ee886c33b before 62db339ecc3d58d8fd83a9e4d80061cd943bb6e2; affected 9856c0de49052174ab474113f4ba40c02aaee086 before e5cd58f61e9d8024ee11bd78c12c8916891d4077; affected 7aecdd47910c51707696e8b0e045b9f88bd4230f before cd4b07507794f7ad1a74e12eca75121d98187e66; affected 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 before 8b930ddc2044e36866c41423e89889e0258695a3; affected 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 before f556b6ba0ac5f8353287ce6ed761228f0b4fafb7; affected 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 before ba4cdc14c0d4df00d3e99bff7fe545303db98183; affected 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 before 4d96930239981f312821a4065db8cc0f8240a173; affected 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 before cbf937dcadfd571a434f8074d057b32cd14fbea5; affected d51d2eeae4ce54d542909c4d9d07bf371a78592c; affected 4203722d51afe3d239e03f15cc73efdf023a7103; affected 5.4.251 before 5.4.292; affected 5.10.188 before 5.10.236; affected 5.15.121 before 5.15.180; affected 6.1.39 before 6.1.134; affected 6.3.13 before 6.4; affected 6.4.4 before 6.5 |
| Linux / Linux | affected 6.5; unaffected 0 before 6.5; unaffected 5.4.292 through 5.4.*; unaffected 5.10.236 through 5.10.*; unaffected 5.15.180 through 5.15.*; unaffected 6.1.134 through 6.1.*; unaffected 6.6.87 through 6.6.*; unaffected 6.12.23 through 6.12.*; unaffected 6.13.11 through 6.13.*; unaffected 6.14.2 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0a0f9aecf66b98959aab7fb5764b4b3e522f4f5b
- https://git.kernel.org/stable/c/62db339ecc3d58d8fd83a9e4d80061cd943bb6e2
- https://git.kernel.org/stable/c/e5cd58f61e9d8024ee11bd78c12c8916891d4077
- https://git.kernel.org/stable/c/cd4b07507794f7ad1a74e12eca75121d98187e66
- https://git.kernel.org/stable/c/8b930ddc2044e36866c41423e89889e0258695a3
- https://git.kernel.org/stable/c/f556b6ba0ac5f8353287ce6ed761228f0b4fafb7
- https://git.kernel.org/stable/c/ba4cdc14c0d4df00d3e99bff7fe545303db98183
- https://git.kernel.org/stable/c/4d96930239981f312821a4065db8cc0f8240a173
- https://git.kernel.org/stable/c/cbf937dcadfd571a434f8074d057b32cd14fbea5