In the Linux kernel, the following vulnerability has been resolved:

wifi: ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs()

Syzkaller reports a long-known leak of urbs in
ath9k_hif_usb_dealloc_tx_urbs().

The cause of the leak is that usb_get_urb() is called but usb_free_urb()
(or usb_put_urb()) is not called inside usb_kill_urb() as urb->dev or
urb->ep fields have not been initialized and usb_kill_urb() returns
immediately.

The patch removes trying to kill urbs located in hif_dev->tx.tx_buf
because hif_dev->tx.tx_buf is not supposed to contain urbs which are in
pending state (the pending urbs are stored in hif_dev->tx.tx_pending).
The tx.tx_lock is acquired so there should not be any changes in the list.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00047.

Key SSVC decision points have not yet been added.

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

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
6f0706ef39fecc6bf56d67728fe0c94e26b43e9d affected < 134ae5eba41294eff76e4be20d6001b8f0192207
795d57a558d106b8a5bc2bd7aeaf707d9a099244 affected < 472312fef2b9eccaa03bd59e0ab2527da945e736
df4318440c1568b7dedc5f7d4e617d0e297a1313 affected < eddbb8f7620f9f8008b090a6e10c460074ca575a
a9990ed2d7ca9339d37c7f67d6f5cb298c3f1b34 affected < 9850791d389b342ae6e573fe8198db0b4d338352
03fb92a432ea5abe5909bca1455b7e44a9380480 affected < c3fb3e9a2c0c1a0fa492d90eb19bcfa92a5f884d
03fb92a432ea5abe5909bca1455b7e44a9380480 affected < d856f7574bcc1d81de565a857caf32f122cd7ce0
03fb92a432ea5abe5909bca1455b7e44a9380480 affected < c05189a429fdb371dd455c3c466d67ac2ebff152
03fb92a432ea5abe5909bca1455b7e44a9380480 affected < 08aa0537ec8cf29ceccae98acc1a534fc12598c1
03fb92a432ea5abe5909bca1455b7e44a9380480 affected < c2a94de38c74e86f49124ac14f093d6a5c377a90
b92e116ae36f498858dbb18e29a066c3f5348965 affected —
7f5972267295fe49f8da8eb42bc2eb3d140860c0 affected —
2d72d5ce63c92f56b9f978e8befb5838144176b9 affected —
Linux Linux affected
Version Status Constraints
5.10 affected —
0 unaffected < 5.10
4.9.337 unaffected ≤ 4.9.*
4.14.303 unaffected ≤ 4.14.*
4.19.270 unaffected ≤ 4.19.*
5.4.229 unaffected ≤ 5.4.*
5.10.163 unaffected ≤ 5.10.*
5.15.86 unaffected ≤ 5.15.*
6.0.16 unaffected ≤ 6.0.*
6.1.2 unaffected ≤ 6.1.*
6.2 unaffected ≤ *

No data.

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/08aa0537ec8cf29ceccae98acc1a534fc12598c1 cve-icon cve-icon
https://git.kernel.org/stable/c/134ae5eba41294eff76e4be20d6001b8f0192207 cve-icon cve-icon
https://git.kernel.org/stable/c/472312fef2b9eccaa03bd59e0ab2527da945e736 cve-icon cve-icon
https://git.kernel.org/stable/c/9850791d389b342ae6e573fe8198db0b4d338352 cve-icon cve-icon
https://git.kernel.org/stable/c/c05189a429fdb371dd455c3c466d67ac2ebff152 cve-icon cve-icon
https://git.kernel.org/stable/c/c2a94de38c74e86f49124ac14f093d6a5c377a90 cve-icon cve-icon
https://git.kernel.org/stable/c/c3fb3e9a2c0c1a0fa492d90eb19bcfa92a5f884d cve-icon cve-icon
https://git.kernel.org/stable/c/d856f7574bcc1d81de565a857caf32f122cd7ce0 cve-icon cve-icon
https://git.kernel.org/stable/c/eddbb8f7620f9f8008b090a6e10c460074ca575a cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025122448-CVE-2022-50740-a780@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50740 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50740 cve-icon
History

Thu, 25 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Wed, 24 Dec 2025 13:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs() Syzkaller reports a long-known leak of urbs in ath9k_hif_usb_dealloc_tx_urbs(). The cause of the leak is that usb_get_urb() is called but usb_free_urb() (or usb_put_urb()) is not called inside usb_kill_urb() as urb->dev or urb->ep fields have not been initialized and usb_kill_urb() returns immediately. The patch removes trying to kill urbs located in hif_dev->tx.tx_buf because hif_dev->tx.tx_buf is not supposed to contain urbs which are in pending state (the pending urbs are stored in hif_dev->tx.tx_pending). The tx.tx_lock is acquired so there should not be any changes in the list. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Title wifi: ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-24T13:05:38.150Z

Reserved: 2025-12-24T13:02:21.542Z

Link: CVE-2022-50740

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-24T13:16:00.703

Modified: 2025-12-29T15:58:34.503

Link: CVE-2022-50740

cve-icon Redhat

Severity : Important

Publid Date: 2025-12-24T00:00:00Z

Links: CVE-2022-50740 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.