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CVE-2025-39999· NVD / CVE Program· CNA Linux

blk-mq: fix blk_mq_tags double free while nr_requests grown

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 392b1d64911f4de8887fe8b68299fa8bd6e5b923, 6.16.11, 8faee580d63bc2a54a59dcdb7f9ce4de29384fec.

Low priority for now. Upgrade to Linux Linux 392b1d64911f4de8887fe8b68299fa8bd6e5b923, 6.16.11, 8faee580d63bc2a54a59dcdb7f9ce4de29384fec or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix blk_mq_tags double free while nr_requests grown In the case user trigger tags grow by queue sysfs attribute nr_requests, hctx->sched_tags will be freed directly and replaced with a new allocated tags, see blk_mq_tag_update_depth(). The problem is that hctx->sched_tags is from elevator->et->tags, while et->tags is still the freed tags, hence later elevator exit will try to free the tags again, causing kernel panic. Fix this problem by replacing et->tags with new allocated tags as well. Noted there are still some long term problems that will require some refactor to be fixed thoroughly[1]. [1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/

—No exploit Fix available
Published
Oct 15, 2025
Updated
Oct 19, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.17affected
    • 58567d8e95c096ad234963df90a2ca518901f4b6 and later · before 8faee580d63bc2a54a59dcdb7f9ce4de29384fecaffected · git
    • f5a6604f7a4405450e4a1f54e5430f47290c500f and later · before 392b1d64911f4de8887fe8b68299fa8bd6e5b923affected · git
    • f5a6604f7a4405450e4a1f54e5430f47290c500f and later · before ba28afbd9eff2a6370f23ef4e6a036ab0cfda409affected · git
    • 6.16.4 and later · before 6.16.11affected · semver
    • before 6.17not affected · semver
    • 6.16.11 and later · up to and including 6.16.*not affected · semver
    • 6.17.1 and later · up to and including 6.17.*not affected · semver
    • 6.18 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 6.16.11-16.16.11-1
openSUSE:Tumbleweedkernel-sourcebefore 6.17.5-1.16.17.5-1.1
openSUSE:Tumbleweedkernel-source-longtermbefore 6.18.16-1.16.18.16-1.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-39997Oct 15, 2025 · ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
    0Monitor
  • ← EarlierCVE-2025-39998Oct 15, 2025 · scsi: target: target_core_configfs: Add length check to avoid buffer overflow
    28Monitor
  • Later →CVE-2025-40000Oct 15, 2025 · wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux392b1d64911f4de8887fe8b68299fa8bd6e5b923Vendor (CNA)
Linux Linux6.16.11Vendor (CNA)
Linux Linux8faee580d63bc2a54a59dcdb7f9ce4de29384fecVendor (CNA)
Linux Linuxba28afbd9eff2a6370f23ef4e6a036ab0cfda409Vendor (CNA)
debian:linux6.16.11-1 · Debian:14Package registry (OSV)
opensuse:kernel-source6.17.5-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:kernel-source-longterm6.18.16-1.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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