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NVD / CVE Program· CNA Linux

CVE-2026-23146: Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 03e8c90c62233382042b7bd0fa8b8900552fdb62, 0c3cd7a0b862c37acbee6d9502107146cc944398, 186d147cf7689ba1f9b3ddb753ab634a84940cc9.

Low priority for now. Upgrade to Linux Linux 03e8c90c62233382042b7bd0fa8b8900552fdb62, 0c3cd7a0b862c37acbee6d9502107146cc944398, 186d147cf7689ba1f9b3ddb753ab634a84940cc9 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: Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work hci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling hci_uart_register_dev(), which calls proto->open() to initialize hu->priv. However, if a TTY write wakeup occurs during this window, hci_uart_tx_wakeup() may schedule write_work before hu->priv is initialized, leading to a NULL pointer dereference in hci_uart_write_work() when proto->dequeue() accesses hu->priv. The race condition is: CPU0 CPU1 ---- ---- hci_uart_set_proto() set_bit(HCI_UART_PROTO_INIT) hci_uart_register_dev() tty write wakeup hci_uart_tty_wakeup() hci_uart_tx_wakeup() schedule_work(&hu->write_work) proto->open(hu) // initializes hu->priv hci_uart_write_work() hci_uart_dequeue() proto->dequeue(hu) // accesses hu->priv (NULL!) Fix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open() succeeds, ensuring hu->priv is initialized before any work can be scheduled.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 14, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-23146

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.4.293 and later · before 5.5
  • linux linux kernel5.10.237 and later · before 5.10.249
  • linux linux kernel5.15.181 and later · before 5.15.199
  • linux linux kernel6.1.135 and later · before 6.1.162
  • linux linux kernel6.6.88 and later · before 6.6.123
  • linux linux kernel6.12.24 and later · before 6.12.69
  • linux linux kernel6.13.12 and later · before 6.14
  • linux linux kernel6.14.3 and later · before 6.18.9
  • linux linux kernel6.19

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

    • 1dcf08fcff5ca529de6dc0395091f28854f4e54a, 8e5aff600539e5faea294d9612cca50220e602b8, db7509fa110dd9b11134b75894677f30353b2c51, 6.15affected
    • a40f94f7caa8d3421b64f63ac31bc0f24c890f39 and later · before b0a900939e7e4866d9b90e9112514b72c451e873affected · git
    • 9e5a0f5777162e503400c70c6ed25fbbe2d38799 and later · before ccc683f597ceb28deb966427ae948e5ac739a909affected · git
    • 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 and later · before 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779affected · git
    • 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 and later · before 186d147cf7689ba1f9b3ddb753ab634a84940cc9affected · git
    • 281782d2c6730241e300d630bb9f200d831ede71 and later · before 53e54cb31e667fca05b1808b990eac0807d1dab0affected · git
    • 5df5dafc171b90d0b8d51547a82657cd5a1986c7 and later · before 03e8c90c62233382042b7bd0fa8b8900552fdb62affected · git
    • 5df5dafc171b90d0b8d51547a82657cd5a1986c7 and later · before 0c3cd7a0b862c37acbee6d9502107146cc944398affected · git
    • 5.10.237 and later · before 5.10.249affected · semver
    • 5.15.181 and later · before 5.15.199affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.9-16.18.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-23144Feb 14, 2026 · mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure
    22Monitor
  • ← EarlierCVE-2026-23145Feb 14, 2026 · ext4: fix iloc.bh leak in ext4_xattr_inode_update_ref
    22Monitor
  • Later →CVE-2026-23148Feb 14, 2026 · nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
    22Monitor

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 Linux03e8c90c62233382042b7bd0fa8b8900552fdb62Vendor (CNA)
Linux Linux0c3cd7a0b862c37acbee6d9502107146cc944398Vendor (CNA)
Linux Linux186d147cf7689ba1f9b3ddb753ab634a84940cc9Vendor (CNA)
Linux Linux5.10.249Vendor (CNA)
Linux Linux5.15.199Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux53e54cb31e667fca05b1808b990eac0807d1dab0Vendor (CNA)
Linux Linux6.1.162Vendor (CNA)
Linux Linux6.12.69Vendor (CNA)
Linux Linux6.14Vendor (CNA)
Linux Linux6.15Vendor (CNA)
Linux Linux6.6.123Vendor (CNA)
Linux Linux937a573423ce5a96fdb1fd425dc6b8d8d4ab5779Vendor (CNA)
Linux Linuxb0a900939e7e4866d9b90e9112514b72c451e873Vendor (CNA)
Linux Linuxccc683f597ceb28deb966427ae948e5ac739a909Vendor (CNA)
debian:linux6.1.162-1 · Debian:12Package 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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

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

All records