CVE-2021-47249 (GCVE-0-2021-47249)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2025-05-04 07:07
VLAI?
Title
net: rds: fix memory leak in rds_recvmsg
Summary
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 | }
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 423c6939758fb3b9cf5abbd1e7792068a5c4ae8c (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 1f79bc8ae81c05eb112a53f981cb2c244ee50d02 (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 06b7cb0194bd1ede0dd27f3a946e7c0279fba44a (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 2038cd15eacdf7512755c27686822e0052eb9042 (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 5946fbf48355f5a8caeff72580c7658da5966b86 (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < b25b60d076164edb3025e85aabd2cf50a5215b91 (git)
Affected: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb , < 49bfcbfd989a8f1f23e705759a6bb099de2cff9f (git)
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    Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 4.4.274 , ≤ 4.4.* (semver)
Unaffected: 4.9.274 , ≤ 4.9.* (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.