CVE-2023-53446
PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free
- Published
- Updated
- Reserved
- Assigned by
- Linux
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]
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 96% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 7badf4d6f49a358a01ab072bbff88d3ee886c33b
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 9856c0de49052174ab474113f4ba40c02aaee086
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 7aecdd47910c51707696e8b0e045b9f88bd4230f
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < d51d2eeae4ce54d542909c4d9d07bf371a78592c
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 4203722d51afe3d239e03f15cc73efdf023a7103
- affected b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 – < 456d8aa37d0f56fc9e985e812496e861dcd6f2f2
- affected 4.11
- unaffected < 4.11
- unaffected 5.4.251 – ≤ 5.4.*
- unaffected 5.10.188 – ≤ 5.10.*
- unaffected 5.15.121 – ≤ 5.15.*
- unaffected 6.1.39 – ≤ 6.1.*
- unaffected 6.3.13 – ≤ 6.3.*
- unaffected 6.4.4 – ≤ 6.4.*
- unaffected 6.5 – ≤ *
References (7)
- https://git.kernel.org/stable/c/666e7f9d60cee23077ea3e6331f6f8a19f7ea03f (opens in a new tab)
- https://git.kernel.org/stable/c/7badf4d6f49a358a01ab072bbff88d3ee886c33b (opens in a new tab)
- https://git.kernel.org/stable/c/9856c0de49052174ab474113f4ba40c02aaee086 (opens in a new tab)
- https://git.kernel.org/stable/c/7aecdd47910c51707696e8b0e045b9f88bd4230f (opens in a new tab)
- https://git.kernel.org/stable/c/d51d2eeae4ce54d542909c4d9d07bf371a78592c (opens in a new tab)
- https://git.kernel.org/stable/c/4203722d51afe3d239e03f15cc73efdf023a7103 (opens in a new tab)
- https://git.kernel.org/stable/c/456d8aa37d0f56fc9e985e812496e861dcd6f2f2 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-53446)Record last updated .