CVE-2021-47249

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Source
https://cve.org/CVERecord?id=CVE-2021-47249
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47249.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47249
Downstream
Related
Published
2024-05-21T15:15:13.857Z
Modified
2026-03-15T22:43:09.011773Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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 rdsrecvmsg(struct socket *sock, struct msghdr *msg, sizet 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 rdscmsgrecv() fail the refcount won't be decremented. And it's easy to see from ftrace log, that rdsincaddref() don't have rdsincput() pair in rdsrecvmsg() after rdscmsg_recv()

1) | rdsrecvmsg() { 1) 3.721 us | rdsincaddref(); 1) 3.853 us | rdsmessageinccopytouser(); 1) + 10.395 us | rdscmsgrecv(); 1) + 34.260 us | }

References

Affected packages

Git /

Affected ranges

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47249.json"
unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "2.6.30"
            },
            {
                "fixed": "4.4.274"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.5"
            },
            {
                "fixed": "4.9.274"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.10"
            },
            {
                "fixed": "4.14.238"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.15"
            },
            {
                "fixed": "4.19.196"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.20"
            },
            {
                "fixed": "5.4.128"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.46"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.12.13"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc3"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc5"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.13-rc6"
            }
        ]
    }
]