CVE-2021-47249 (GCVE-0-2021-47249)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-04 07:07
Severity ?
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 | }
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91 Patch
Impacted products
Vendor Product Version
Linux Linux Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
Version: bdbe6fbc6a2f2ccfb384b141b257677d2a8d36fb
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47249\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:13.857\",\"lastModified\":\"2024-12-30T19:01:43.417\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: rds: fix memory leak in rds_recvmsg\\n\\nSyzbot reported memory leak in rds. The problem\\nwas in unputted refcount in case of error.\\n\\nint rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,\\n\\t\\tint msg_flags)\\n{\\n...\\n\\n\\tif (!rds_next_incoming(rs, \u0026inc)) {\\n\\t\\t...\\n\\t}\\n\\nAfter this \\\"if\\\" inc refcount incremented and\\n\\n\\tif (rds_cmsg_recv(inc, msg, rs)) {\\n\\t\\tret = -EFAULT;\\n\\t\\tgoto out;\\n\\t}\\n...\\nout:\\n\\treturn ret;\\n}\\n\\nin case of rds_cmsg_recv() fail the refcount won\u0027t be\\ndecremented. And it\u0027s easy to see from ftrace log, that\\nrds_inc_addref() don\u0027t have rds_inc_put() pair in\\nrds_recvmsg() after rds_cmsg_recv()\\n\\n 1)               |  rds_recvmsg() {\\n 1)   3.721 us    |    rds_inc_addref();\\n 1)   3.853 us    |    rds_message_inc_copy_to_user();\\n 1) + 10.395 us   |    rds_cmsg_recv();\\n 1) + 34.260 us   |  }\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:rds: corrige p\u00e9rdida de memoria en rds_recvmsg. Syzbot inform\u00f3 p\u00e9rdida de memoria en rds. El problema estaba en el recuento no puesto en caso de error. int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int msg_flags) { ... if (!rds_next_incoming(rs, \u0026amp;inc)) { ... } Despu\u00e9s de esto \\\"if\\\" inc refcount incrementado y if (rds_cmsg_recv (inc, mensaje, rs)) { ret = -EFAULT; salir; } ... fuera: devolver ret; } en caso de que rds_cmsg_recv() falle, el recuento no disminuir\u00e1. Y es f\u00e1cil ver en el registro de ftrace que rds_inc_addref() no tiene el par rds_inc_put() en rds_recvmsg() despu\u00e9s de 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| 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    "vulnrichment": {
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\"https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f\"}], \"x_generator\": {\"engine\": \"bippy-c8e10e5f6187\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: rds: fix memory leak in rds_recvmsg\\n\\nSyzbot reported memory leak in rds. The problem\\nwas in unputted refcount in case of error.\\n\\nint rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,\\n\\t\\tint msg_flags)\\n{\\n...\\n\\n\\tif (!rds_next_incoming(rs, \u0026inc)) {\\n\\t\\t...\\n\\t}\\n\\nAfter this \\\"if\\\" inc refcount incremented and\\n\\n\\tif (rds_cmsg_recv(inc, msg, rs)) {\\n\\t\\tret = -EFAULT;\\n\\t\\tgoto out;\\n\\t}\\n...\\nout:\\n\\treturn ret;\\n}\\n\\nin case of rds_cmsg_recv() fail the refcount won\u0027t be\\ndecremented. And it\u0027s easy to see from ftrace log, that\\nrds_inc_addref() don\u0027t have rds_inc_put() pair in\\nrds_recvmsg() after rds_cmsg_recv()\\n\\n 1)               |  rds_recvmsg() {\\n 1)   3.721 us    |    rds_inc_addref();\\n 1)   3.853 us    |    rds_message_inc_copy_to_user();\\n 1) + 10.395 us   |    rds_cmsg_recv();\\n 1) + 34.260 us   |  }\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T11:37:35.230Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47249\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T11:37:35.230Z\", \"dateReserved\": \"2024-04-10T18:59:19.536Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:46.238Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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