# CVE-2025-21635: rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy

CVE-2025-21635 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2025-21635, released January 19, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-21635
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 19, 2025
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21635

## Description

In the Linux kernel, the following vulnerability has been resolved:  rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy  As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons:  - Inconsistency: getting info from the reader's/writer's netns vs only   from the opener's netns.  - current->nsproxy can be NULL in some cases, resulting in an 'Oops'   (null-ptr-deref), e.g. when the current task is exiting, as spotted by   syzbot [1] using acct(2).  The per-netns structure can be obtained from the table->data using container_of(), then the 'net' one can be retrieved from the listen socket (if available).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.34.2 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.34.2 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.20.3.1 | [SUSE-SU-2025:01967-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01967-1.md) | Jun 16, 2025 |
| Linux | kernel-coco sles 15.6 | 6.4.0-15061.21.coco15sp6.1 | [SUSE-SU-2025:01919-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01919-1.md) | Jun 12, 2025 |
| Linux | kernel-coco_debug sles 15.6 | 6.4.0-15061.21.coco15sp6.1 | [SUSE-SU-2025:01919-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01919-1.md) | Jun 12, 2025 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.47.2.150600.12.20.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.47.2.150600.12.20.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.3.1.150700.17.2.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_10 sles 15.6 | 1-150600.1.5.1 | [SUSE-SU-2025:1178-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1178-1.md) | Apr 8, 2025 |
| Linux | kernel-livepatch-SLE15-SP6_Update_10 sles 15.6 | 1-150600.13.5.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-livepatch-SLE15-SP7_Update_1 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.34.1 | [SUSE-SU-2025:1178-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1178-1.md) | Apr 8, 2025 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.34.1 | [SUSE-SU-2025:1178-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1178-1.md) | Apr 8, 2025 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.34.2 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.34.2 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-source-azure sles 15.7 | 6.4.0-150700.20.3.1 | [SUSE-SU-2025:01967-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01967-1.md) | Jun 16, 2025 |
| Linux | kernel-source-coco sles 15.6 | 6.4.0-15061.21.coco15sp6.1 | [SUSE-SU-2025:01919-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01919-1.md) | Jun 12, 2025 |
| Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.34.1 | [SUSE-SU-2025:1178-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1178-1.md) | Apr 8, 2025 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.47.1 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.34.1 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.34.1 | [SUSE-SU-2025:1177-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1177-1.md) | Apr 8, 2025 |
| Linux | kernel-syms-azure sles 15.7 | 6.4.0-150700.20.3.1 | [SUSE-SU-2025:01967-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01967-1.md) | Jun 16, 2025 |
| Linux | kernel-syms-coco sles 15.6 | 6.4.0-15061.21.coco15sp6.1 | [SUSE-SU-2025:01919-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01919-1.md) | Jun 12, 2025 |
| Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.34.1 | [SUSE-SU-2025:1178-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1178-1.md) | Apr 8, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.47.2 | [SUSE-SU-2025:1180-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-1180-1.md) | Apr 9, 2025 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.3.1 | [SUSE-SU-2025:01951-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01951-1.md) | Jun 13, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.10-1 | [DEBIAN-CVE-2025-21635](https://patchblox.com/security/data/fix/linux/debian-cve-2025-21635.md) | Jan 19, 2025 |
| Linux | linux Debian 14 | 6.12.10-1 | [DEBIAN-CVE-2025-21635](https://patchblox.com/security/data/fix/linux/debian-cve-2025-21635.md) | Jan 19, 2025 |

---

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