# CVE-2021-47249: linux: In the Linux kernel, the following vulnerability has been resolved:  net: rds: fix memory leak in rds_recvmsg  Syzbot...

CVE-2021-47249 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47249, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47249
- 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:  net: rds: fix memory leak in rds_recvmsg  Syzbot reported memory leak in rds. The problem was in unputted refcount in case of error.  int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 		int msg_flags) { ...  	if (!rds_next_incoming(rs, &inc)) { 		... 	}  After this "if" inc refcount incremented and  	if (rds_cmsg_recv(inc, msg, rs)) { 		ret = -EFAULT; 		goto out; 	} ... out: 	return ret; }  in case of rds_cmsg_recv() fail the refcount won't be decremented. And it's easy to see from ftrace log, that rds_inc_addref() don't have rds_inc_put() pair in rds_recvmsg() after rds_cmsg_recv()   1)               |  rds_recvmsg() {  1)   3.721 us    |    rds_inc_addref();  1)   3.853 us    |    rds_message_inc_copy_to_user();  1) + 10.395 us   |    rds_cmsg_recv();  1) + 34.260 us   |  }

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47249](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47249.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47249](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47249.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47249](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47249.md) | May 21, 2024 |

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