CVE-2021-47496

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Source
https://cve.org/CVERecord?id=CVE-2021-47496
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47496.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-47496
Downstream
Related
Published
2024-05-22T09:15:11.447Z
Modified
2026-03-13T05:20:46.808736Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

net/tls: Fix flipped sign in tlserrabort() calls

sk->sk_err appears to expect a positive value, a convention that ktls doesn't always follow and that leads to memory corruption in other code. For instance,

[kworker]
tls_encrypt_done(..., err=<negative error from crypto request>)
  tls_err_abort(.., err)
    sk->sk_err = err;

[task]
splice_from_pipe_feed
  ...
    tls_sw_do_sendpage
      if (sk->sk_err) {
        ret = -sk->sk_err;  // ret is positive

splice_from_pipe_feed (continued)
  ret = actor(...)  // ret is still positive and interpreted as bytes
                    // written, resulting in underflow of buf->len and
                    // sd->len, leading to huge buf->offset and bogus
                    // addresses computed in later calls to actor()

Fix all tlserrabort() callers to pass a negative error code consistently and centralize the error-prone sign flip there, throwing in a warning to catch future misuse and uninlining the function so it really does only warn once.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "4.17"
            },
            {
                "fixed": "5.4.157"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.77"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.14.16"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc3"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc5"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc6"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc7"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47496.json"