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Review reviewHigh

CVE-2021-46973

Linux Linux, linux_kernel, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..

CVSS
7.8
EPSS
0.23%
13.8% percentile
CISA KEV
Not listed
Published
2024.02.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.23%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..

Affected product and versions

Product
Linux Linux, linux_kernel, linux kernel
Affected versions
>= 6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 48ec949ac979b4b42d740f67b6177797af834f80, >= 6e728f321393b1fce9e1c2c3e55f9f7c15991321 < ea474054c2cc6e1284604b21361f475c7cc8c0a0, >= 6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 03c649dee8b1eb5600212a249542a70f47a5ab40, >= 6e728f321393b1fce9e1c2c3e55f9f7c15991321 < 47a017f33943278570c072bc71681809b2567b3a, >= 5.8, >= 6e728f321393 < 48ec949ac979, >= 6e728f321393 < ea474054c2cc, >= 6e728f321393 <= 03c649dee8b1, >= 6e728f321393 < 47a017f33943, >= 5.8 <= 5.10.35, >= 5.11 <= 5.11.19, >= 5.12 <= 5.12.2
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 Linux, linux_kernel, 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