# CVE-2021-47179: linux: In the Linux kernel, the following vulnerability has been resolved:  NFSv4: Fix a NULL pointer dereference in pnfs_ma...

CVE-2021-47179 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47179, released March 25, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47179
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0068
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()  Commit de144ff4234f changes _pnfs_return_layout() to call pnfs_mark_matching_lsegs_return() passing NULL as the struct pnfs_layout_range argument. Unfortunately, pnfs_mark_matching_lsegs_return() doesn't check if we have a value here before dereferencing it, causing an oops.  I'm able to hit this crash consistently when running connectathon basic tests on NFS v4.1/v4.2 against Ontap.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47179](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47179.md) | Mar 25, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47179](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47179.md) | Mar 25, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47179](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47179.md) | Mar 25, 2024 |

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