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Review reviewHigh

CVE-2024-53170

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: block: fix uaf for flush rq while iterating tags blk_mq_clear_flush_rq_mapping() is not called during scsi probe, by checking blk_queue_init_done(). However, QUEUE_FLAG_INIT_DONE is cleared in del_gendisk by commit aec89dc5d421 ("block: keep q_usage_counter in atomic mode after del_gendisk"), hence for disk like scsi, following blk_mq_destroy_queue() will not clear flush rq from tags->rqs[] as well, cause following uaf that is found by our syzkaller for v6.6: =================================================================...

CVSS
7.8
EPSS
0.24%
15.1% percentile
CISA KEV
Not listed
Published
2024.12.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: block: fix uaf for flush rq while iterating tags blk_mq_clear_flush_rq_mapping() is not called during scsi probe, by checking blk_queue_init_done(). However, QUEUE_FLAG_INIT_DONE is cleared in del_gendisk by commit aec89dc5d421 ("block: keep q_usage_counter in atomic mode after del_gendisk"), hence for disk like scsi, following blk_mq_destroy_queue() will not clear flush rq from tags->rqs[] as well, cause following uaf that is found by our syzkaller for v6.6: =================================================================...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 6cfeadbff3f8905f2854735ebb88e581402c16c4 < 1921fe7d2836f8be1d321cf430d17e0d4e05301b, >= 6cfeadbff3f8905f2854735ebb88e581402c16c4 < 1364a29b71c7837770f1902c49e7a6e234d72c92, >= 6cfeadbff3f8905f2854735ebb88e581402c16c4 < a0e93b9fefafe97d596f9c98701ae6c3b04b3ff6, >= 6cfeadbff3f8905f2854735ebb88e581402c16c4 < 61092568f2a9acb0e6e186f03f2e0649a4e86d09, >= 6cfeadbff3f8905f2854735ebb88e581402c16c4 < 3802f73bd80766d70f319658f334754164075bc3, >= 5.19, >= V3.1.6, >= 5.19 < 6.11.11, >= 6.12 < 6.12.2
Fixed versions
6.11.11, 6.12.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 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