Resource Leak Affecting kernel-devel package, versions *


Severity

Recommended
low

Based on CentOS security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-CENTOS6-KERNELDEVEL-7102702
  • published24 May 2024
  • disclosed21 May 2024

Introduced: 21 May 2024

CVE-2021-47249  (opens in a new tab)
CWE-402  (opens in a new tab)

How to fix?

There is no fixed version for Centos:6 kernel-devel.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-devel package and not the kernel-devel package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

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() {
    
  2. 3.721 us | rds_inc_addref();
  3. 3.853 us | rds_message_inc_copy_to_user();
    • 10.395 us | rds_cmsg_recv();
    • 34.260 us | }

CVSS Scores

version 3.1