CVE-2021-47249
Linux Kernel RDS Memory Leak Vulnerability
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 | }
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
Dec. 30, 2024, 7:01 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47249.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47249 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47249 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 30, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.30 up to (excluding) 4.4.274 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.274 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.238 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.196 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.128 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.46 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.13 *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a No Types Assigned https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a Patch Changed Reference Type https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a No Types Assigned https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a Patch Changed Reference Type https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 No Types Assigned https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 Patch Changed Reference Type https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 No Types Assigned https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 Patch Changed Reference Type https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 No Types Assigned https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 Patch Changed Reference Type https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 No Types Assigned https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 Patch Changed Reference Type https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c No Types Assigned https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c Patch Changed Reference Type https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c No Types Assigned https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c Patch Changed Reference Type https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f No Types Assigned https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f Patch Changed Reference Type https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f No Types Assigned https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f Patch Changed Reference Type https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 No Types Assigned https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 Patch Changed Reference Type https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 No Types Assigned https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 Patch Changed Reference Type https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f No Types Assigned https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f Patch Changed Reference Type https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f No Types Assigned https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f Patch Changed Reference Type https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 No Types Assigned https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 Patch Changed Reference Type https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 No Types Assigned https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a Added Reference https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 Added Reference https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 Added Reference https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c Added Reference https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f Added Reference https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 Added Reference https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f Added Reference https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added 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 | } Added Reference kernel.org https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47249 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47249
weaknesses.