CVE-2021-47496

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47496
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47496.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47496
Related
Published
2024-05-22T09:15:11Z
Modified
2024-09-18T03:17:29.055963Z
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

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.84-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}