CVE-2023-53446
In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free Struct pcie_link_state->downstream is a pointer to the pci_dev of function 0.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.15%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free Struct pcie_link_state->downstream is a pointer to the pci_dev of function 0. Previously we retained that pointer when removing function 0, and subsequent ASPM policy changes dereferenced it, resulting in a use-after-free warning from KASAN, e.g.: # echo 1 > /sys/bus/pci/devices/0000:03:00.0/remove # echo powersave > /sys/module/pcie_aspm/parameters/policy BUG: KASAN: slab-use-after-free in pcie_config_aspm_link+0x42d/0x500 Call Trace: kasan_report+0xae/0xe0 pcie_config_aspm_link+0x42d/0x500 pcie_aspm_set_policy+0x8e/0x1a0 param_attr_store+0x162/0x2c0 module_attr_store+0x3e/0x80 PCIe spec r6.0, sec 7.5.3.7, recommends that software program the same ASPM Control value in all functions of multi-function devices. Disable ASPM and free the pcie_link_state when any child function is removed so we can discard the dangling pcie_link_state->downstream pointer and maintain the same ASPM Control configuration for all functions. [bhelgaas: commit log and comment]
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.15% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/4203722d51afe3d239e03f15cc73efdf023a7103Patch
- https://git.kernel.org/stable/c/456d8aa37d0f56fc9e985e812496e861dcd6f2f2Patch
- https://git.kernel.org/stable/c/666e7f9d60cee23077ea3e6331f6f8a19f7ea03fPatch
- https://git.kernel.org/stable/c/7aecdd47910c51707696e8b0e045b9f88bd4230fPatch
- https://git.kernel.org/stable/c/7badf4d6f49a358a01ab072bbff88d3ee886c33bPatch
- https://git.kernel.org/stable/c/9856c0de49052174ab474113f4ba40c02aaee086Patch
- https://git.kernel.org/stable/c/d51d2eeae4ce54d542909c4d9d07bf371a78592cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.