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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47249net: rds: fix memory leak in rds_recvmsg

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 85.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 | }

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-1DEBIAN-CVE-2021-47249
Debian:13linux5.10.46-1DEBIAN-CVE-2021-47249
Debian:14linux5.10.46-1DEBIAN-CVE-2021-47249
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47249
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47249
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47249

Affected products (as reported)

VendorProductVersions
Linux Linux bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 8c3ec88b03e9e4ca117dcdc4204fd3edcd02084fbdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 423c6939758fb3b9cf5abbd1e7792068a5c4ae8cbdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 1f79bc8ae81c05eb112a53f981cb2c244ee50d02bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 06b7cb0194bd1ede0dd27f3a946e7c0279fba44abdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 2038cd15eacdf7512755c27686822e0052eb9042bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 5946fbf48355f5a8caeff72580c7658da5966b86bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before b25b60d076164edb3025e85aabd2cf50a5215b91bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb – before 49bfcbfd989a8f1f23e705759a6bb099de2cff9f
Linux Linux 2.6.30

References