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Review reviewCritical

CVE-2022-49093

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: skbuff: fix coalescing for page_pool fragment recycling Fix a use-after-free when using page_pool with page fragments. We encountered this problem during normal RX in the hns3 driver: (1) Initially we have three descriptors in the RX queue. The first one allocates PAGE1 through page_pool, and the other two allocate one half of PAGE2 each. Page references look like this: RX_BD1 _______ PAGE1 RX_BD2 _______ PAGE2 RX_BD3 _________/ (2) Handle RX on the first descriptor. Allocate SKB1, eventually added to the receive queue by t...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.02.26
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: skbuff: fix coalescing for page_pool fragment recycling Fix a use-after-free when using page_pool with page fragments. We encountered this problem during normal RX in the hns3 driver: (1) Initially we have three descriptors in the RX queue. The first one allocates PAGE1 through page_pool, and the other two allocate one half of PAGE2 each. Page references look like this: RX_BD1 _______ PAGE1 RX_BD2 _______ PAGE2 RX_BD3 _________/ (2) Handle RX on the first descriptor. Allocate SKB1, eventually added to the receive queue by t...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 53e0961da1c7bbdabd1abebb20de403ec237ec09 < ba965e8605aee5387cecaa28fcf7ee9f61779a49, >= 53e0961da1c7bbdabd1abebb20de403ec237ec09 < c4fa19615806a9a7e518c295b39175aa47a685ac, >= 53e0961da1c7bbdabd1abebb20de403ec237ec09 < 72bb856d16e883437023ff2ff77d0c498018728a, >= 53e0961da1c7bbdabd1abebb20de403ec237ec09 < 1effe8ca4e34c34cdd9318436a4232dcb582ebf4, >= 5.15, >= 5.15 < 5.15.34, >= 5.16 < 5.16.20, >= 5.17 < 5.17.3, 5.18
Fixed versions
5.15.34, 5.16.20, 5.17.3

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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416