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debiancveDebian Security Bug TrackerDEBIANCVE:CVE-2021-47249
HistoryMay 21, 2024 - 3:15 p.m.

CVE-2021-47249

2024-05-2115:15:13
Debian Security Bug Tracker
security-tracker.debian.org
9
linux kernel
rds vulnerability
cve-2021-47249
memory leak fix
syzbot reported
refcount error
ftrace log

6.9 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

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 | }

6.9 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%