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Review reviewHigh

CVE-2022-48742

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink() While looking at one unrelated syzbot bug, I found the replay logic in __rtnl_newlink() to potentially trigger use-after-free. It is better to clear master_dev and m_ops inside the loop, in case we have to replay it.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.06.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink() While looking at one unrelated syzbot bug, I found the replay logic in __rtnl_newlink() to potentially trigger use-after-free. It is better to clear master_dev and m_ops inside the loop, in case we have to replay it.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= ba7d49b1f0f8e5f24294a880ed576964059af5ef < 2cf180360d66bd657e606c1217e0e668e6faa303, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < 7d9211678c0f0624f74cdff36117ab8316697bb8, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < a01e60a1ec6bef9be471fb7182a33c6d6f124e93, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < bd43771ee9759dd9dfae946bff190e2c5a120de5, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < 3bbe2019dd12b8d13671ee6cda055d49637b4c39, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < def5e7070079b2a214b3b1a2fbec623e6fbfe34a, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < 36a9a0aee881940476b254e0352581401b23f210, >= ba7d49b1f0f8e5f24294a880ed576964059af5ef < c6f6f2444bdbe0079e41914a35081530d0409963, >= 3.14, >= 3.14 < 4.9.300, >= 4.10 < 4.14.265, >= 4.15 < 4.19.228, >= 4.20 < 5.4.177, >= 5.5 < 5.10.97, >= 5.11 < 5.15.20, >= 5.16 < 5.16.6
Fixed versions
4.9.300, 4.14.265, 4.19.228, 5.4.177, 5.10.97, 5.15.20, 5.16.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416