CVE-2021-47249

published 2024-05-21

CVE-2021-47249: 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…

Priority P4 16 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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 | }

Affected

22 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.10.46-1 (bookworm)	linux 5.10.46-1 (bookworm)
linux	linux	—	—
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f	8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 423c6939758fb3b9cf5abbd1e7792068a5c4ae8c	423c6939758fb3b9cf5abbd1e7792068a5c4ae8c
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 1f79bc8ae81c05eb112a53f981cb2c244ee50d02	1f79bc8ae81c05eb112a53f981cb2c244ee50d02
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 06b7cb0194bd1ede0dd27f3a946e7c0279fba44a	06b7cb0194bd1ede0dd27f3a946e7c0279fba44a
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 2038cd15eacdf7512755c27686822e0052eb9042	2038cd15eacdf7512755c27686822e0052eb9042
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 5946fbf48355f5a8caeff72580c7658da5966b86	5946fbf48355f5a8caeff72580c7658da5966b86
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < b25b60d076164edb3025e85aabd2cf50a5215b91	b25b60d076164edb3025e85aabd2cf50a5215b91
linux	linux	>= bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb < 49bfcbfd989a8f1f23e705759a6bb099de2cff9f	49bfcbfd989a8f1f23e705759a6bb099de2cff9f
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.46-1	5.10.46-1
linux	linux_kernel	>= 0 < 5.10.46-1	5.10.46-1
linux	linux_kernel	>= 0 < 5.10.46-1	5.10.46-1
linux	linux_kernel	>= 0 < 5.10.46-1	5.10.46-1
linux	linux_kernel	>= 2.6.30 < 4.4.274	4.4.274
linux	linux_kernel	>= 4.10 < 4.14.238	4.14.238
linux	linux_kernel	>= 4.15 < 4.19.196	4.19.196
linux	linux_kernel	>= 4.20 < 5.4.128	5.4.128
linux	linux_kernel	>= 4.5 < 4.9.274	4.9.274
linux	linux_kernel	>= 5.11 < 5.12.13	5.12.13
linux	linux_kernel	>= 5.5 < 5.10.46	5.10.46

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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