CVE-2015-9016 — kernel: Race condition in block/blk-mq.c:blk_mq_tag_to_rq() can lead to kernel oops

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HIGH

kernel: Race condition in block/blk-mq.c:blk_mq_tag_to_rq() can lead to kernel oops

Published Apr 5, 2018

7.0

HIGH

CVSS 3.0

EPSS 0.14%

Description

In blk_mq_tag_to_rq in blk-mq.c in the upstream kernel, there is a possible use after free due to a race condition when a request has been previously freed by blk_mq_complete_request. This could lead to local escalation of privilege. Product: Android. Versions: Android kernel. Android ID: A-63083046.

Affected products

Vendor Google Inc. Product Android Default
n/a
- Version
  Android kernel
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Google Inc.

Android

n/a

Version	Status	Constraints
Android kernel	affected	-

Red Hat Enterprise Linux 5

kernel

Not affected
Red Hat Enterprise Linux 6

kernel

Not affected
Red Hat Enterprise Linux 7

kernel

Not affected
Red Hat Enterprise Linux 7

kernel-alt

Not affected
Red Hat Enterprise Linux 7

kernel-rt

Not affected
Red Hat Enterprise Linux 8

kernel

Not affected
Red Hat Enterprise MRG 2

realtime-kernel

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 5	kernel	Not affected	n/a
Red Hat Enterprise Linux 6	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel-alt	Not affected	n/a
Red Hat Enterprise Linux 7	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 8	kernel	Not affected	n/a
Red Hat Enterprise MRG 2	realtime-kernel	Not affected	n/a

Remediation

Red Hat statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux.

Metrics

0.14% 0.00143

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00143

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.14% (0.00143)	3.06th	v5 (v2026.06.15)
Jun 15, 2026	0.15% (0.00146)	4.20th	v5 (v2026.06.15)
Mar 17, 2025	0.02% (0.00024)	3.77th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00042)	5.07th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00042)	5.63th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00890)	30.33th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00890)	28.64th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00890)	26.62th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00890)	12.04th	v2 (v2022.01.01)

Weaknesses (2)

CWE-264

CWE-362

Race Condition

References (7)

https://access.redhat.com/security/cve/CVE-2015-9016
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1544700
Issue Tracking
https://github.com/torvalds/linux/commit/0048b4837affd153897ed1222283492070027aa9
x_refsource_CONFIRMPatchVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2015-9016
https://source.android.com/security/bulletin/2018-02-01
x_refsource_CONFIRMPatchVendor Advisory
https://www.cve.org/CVERecord?id=CVE-2015-9016
https://www.debian.org/security/2018/dsa-4187
vendor-advisoryx_refsource_DEBIAN

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2015-9016		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1544700		Issue Tracking
https://github.com/torvalds/linux/commit/0048b4837affd153897ed1222283492070027aa9		x_refsource_CONFIRMPatchVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2015-9016
https://source.android.com/security/bulletin/2018-02-01		x_refsource_CONFIRMPatchVendor Advisory
https://www.cve.org/CVERecord?id=CVE-2015-9016
https://www.debian.org/security/2018/dsa-4187		vendor-advisoryx_refsource_DEBIAN