# CVE-2021-47005: linux: In the Linux kernel, the following vulnerability has been resolved:  PCI: endpoint: Fix NULL pointer dereference for...

CVE-2021-47005 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47005, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47005
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  PCI: endpoint: Fix NULL pointer dereference for ->get_features()  get_features ops of pci_epc_ops may return NULL, causing NULL pointer dereference in pci_epf_test_alloc_space function. Let us add a check for pci_epc_feature pointer in pci_epf_test_bind before we access it to avoid any such NULL pointer dereference and return -ENOTSUPP in case pci_epc_feature is not found.  When the patch is not applied and EPC features is not implemented in the platform driver, we see the following dump due to kernel NULL pointer dereference.  Call trace:  pci_epf_test_bind+0xf4/0x388  pci_epf_bind+0x3c/0x80  pci_epc_epf_link+0xa8/0xcc  configfs_symlink+0x1a4/0x48c  vfs_symlink+0x104/0x184  do_symlinkat+0x80/0xd4  __arm64_sys_symlinkat+0x1c/0x24  el0_svc_common.constprop.3+0xb8/0x170  el0_svc_handler+0x70/0x88  el0_svc+0x8/0x640 Code: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ end trace a438e3c5a24f9df0 ]---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47005](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47005.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47005](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47005.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47005](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47005.md) | Feb 28, 2024 |

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