SECUFOCUSNOW
Home›CVE index›CVE-2022-50865
Review reviewHigh

CVE-2022-50865

Linux

In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload.

CVSS
7.5
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.12.30
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload.

Affected product and versions

Product
Linux
Affected versions
>= c9c3321257e1b95be9b375f811fb250162af8d39 < 9d04b4d0feee12bce6bfe37f30d8e953d3c30368, >= c9c3321257e1b95be9b375f811fb250162af8d39 < 4f23cb2be530785db284a685d1b1c30224d8a538, >= c9c3321257e1b95be9b375f811fb250162af8d39 < a85d39f14aa8a71e29cfb5eb5de02878a8779898, >= c9c3321257e1b95be9b375f811fb250162af8d39 < 28addf029417d53b1df062b4c87feb7bc033cb5f, >= c9c3321257e1b95be9b375f811fb250162af8d39 < ec791d8149ff60c40ad2074af3b92a39c916a03f, >= 4.9
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available