# CVE-2021-47333: linux: In the Linux kernel, the following vulnerability has been resolved:  misc: alcor_pci: fix null-ptr-deref when there i...

CVE-2021-47333 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47333, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47333
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge  There is an issue with the ASPM(optional) capability checking function. A device might be attached to root complex directly, in this case, bus->self(bridge) will be NULL, thus priv->parent_pdev is NULL. Since alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's ASPM capability and populate parent_cap_off, which will be used later by alcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do here is to avoid checking the capability if we are on the root complex. This will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply return when bring called, effectively disable ASPM for the device.  [    1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0 [    1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [    1.253998] Call Trace: [    1.254131]  ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [    1.254476]  alcor_pci_probe+0x169/0x2d5 [alcor_pci]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47333](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47333.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47333](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47333.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47333](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47333.md) | May 21, 2024 |

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