CVE-2026-98890

wifi: libertas: reject short monitor TX frames

Published Oct 23, 2026 CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed

Description

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

wifi: libertas: reject short monitor TX frames

In monitor mode, lbs_hard_start_xmit() casts skb->data to a
radiotap TX header, skips that header, and then copies the 802.11
destination address from offset 4 in the remaining frame. The
generic length check only rejects zero-length and oversized skbs, so
a short monitor frame can be read past the end of the skb data.

Require enough bytes for the radiotap TX header and the destination
address field before using the monitor-mode header layout.

Affected Products

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

unaffected

Version	Status	Constraints
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< 68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< d865dd6de8295f2bfaa83f0f5d49d2bef1543065
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< 6576baa3fdbaa91fa75e4ba27095f4b8a27349a8
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< 443fac3de65c76544b450b9f9903be8989150d55
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< cdcfd662c67833d89ee3d912efde2eb67c8a7326
`876c9d3aeb989cf1961f2c228d309ba5dcfb1172`	affected	< 13ff543e0b2c713aedeaadadde686686e949dc78

Linux

affected

Version	Status	Constraints
`2.6.22`	affected	—
`0`	unaffected	< 2.6.22
`5.10.271`	unaffected	≤ 5.10.*
`5.15.222`	unaffected	≤ 5.15.*
`6.1.189`	unaffected	≤ 6.1.*
`6.6.158`	unaffected	≤ 6.6.*
`6.12.111`	unaffected	≤ 6.12.*
`6.18.53`	unaffected	≤ 6.18.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d865dd6de8295f2bfaa83f0f5d49d2bef1543065)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6576baa3fdbaa91fa75e4ba27095f4b8a27349a8)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b657cc98b7936c5d9ed7e0e1944ad0e1f36375bb)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,443fac3de65c76544b450b9f9903be8989150d55)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,cdcfd662c67833d89ee3d912efde2eb67c8a7326)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,13ff543e0b2c713aedeaadadde686686e949dc78)`	affected	code_commit	—
`[0,5.10.271)`	affected	semver	—
`[0,5.15.222)`	affected	semver	—
`[0,6.1.189)`	affected	semver	—
`[0,6.6.158)`	affected	semver	—
`[0,6.12.111)`	affected	semver	—
`[0,6.18.53)`	affected	semver	—

Linux

Version	Status	Scheme	Platform
`[5.10.271,5.10.*]`	unaffected	generic	—
`[5.15.222,5.15.*]`	unaffected	generic	—
`[6.1.189,6.1.*]`	unaffected	generic	—
`[6.6.158,6.6.*]`	unaffected	generic	—
`[6.12.111,6.12.*]`	unaffected	generic	—
`[6.18.53,6.18.*]`	unaffected	generic	—
`[7.2,*]`	unaffected	generic	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d865dd6de8295f2bfaa83f0f5d49d2bef1543065)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6576baa3fdbaa91fa75e4ba27095f4b8a27349a8)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b657cc98b7936c5d9ed7e0e1944ad0e1f36375bb)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,443fac3de65c76544b450b9f9903be8989150d55)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,cdcfd662c67833d89ee3d912efde2eb67c8a7326)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,13ff543e0b2c713aedeaadadde686686e949dc78)`	affected	code_commit	—
`[0,5.10.271)`	affected	semver	—
`[0,5.15.222)`	affected	semver	—
`[0,6.1.189)`	affected	semver	—
`[0,6.6.158)`	affected	semver	—
`[0,6.12.111)`	affected	semver	—
`[0,6.18.53)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[5.10.271,5.10.*]`	unaffected	generic	—
`[5.15.222,5.15.*]`	unaffected	generic	—
`[6.1.189,6.1.*]`	unaffected	generic	—
`[6.6.158,6.6.*]`	unaffected	generic	—
`[6.12.111,6.12.*]`	unaffected	generic	—
`[6.18.53,6.18.*]`	unaffected	generic	—
`[7.2,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.187% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98890.mbox
https://git.kernel.org/stable/c/13ff543e0b2c713aedeaadadde686686e949dc78
https://git.kernel.org/stable/c/443fac3de65c76544b450b9f9903be8989150d55
https://git.kernel.org/stable/c/6576baa3fdbaa91fa75e4ba27095f4b8a27349a8
https://git.kernel.org/stable/c/68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c
https://git.kernel.org/stable/c/b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb
https://git.kernel.org/stable/c/cdcfd662c67833d89ee3d912efde2eb67c8a7326
https://git.kernel.org/stable/c/d865dd6de8295f2bfaa83f0f5d49d2bef1543065
https://nvd.nist.gov/vuln/detail/CVE-2026-98890
https://www.cve.org/CVERecord?id=CVE-2026-98890

History

Oct 27, 2026 9:45 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-20

Oct 27, 2026 4:30 AM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-125
References		https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98890.mbox https://nvd.nist.gov/vuln/detail/CVE-2026-98890 https://www.cve.org/CVERecord?id=CVE-2026-98890
Metrics	threat_severity `None`	cvssV3_1 `{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Oct 23, 2026 6:00 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20

Oct 23, 2026 5:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Linux linux
Vendors & Products		Linux linux

Oct 23, 2026 12:00 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: reject short monitor TX frames In monitor mode, lbs_hard_start_xmit() casts skb->data to a radiotap TX header, skips that header, and then copies the 802.11 destination address from offset 4 in the remaining frame. The generic length check only rejects zero-length and oversized skbs, so a short monitor frame can be read past the end of the skb data. Require enough bytes for the radiotap TX header and the destination address field before using the monitor-mode header layout.
Title		wifi: libertas: reject short monitor TX frames
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/13ff543e0b2c713aedeaadadde686686e949dc78 https://git.kernel.org/stable/c/443fac3de65c76544b450b9f9903be8989150d55 https://git.kernel.org/stable/c/6576baa3fdbaa91fa75e4ba27095f4b8a27349a8 https://git.kernel.org/stable/c/68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c https://git.kernel.org/stable/c/b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb https://git.kernel.org/stable/c/cdcfd662c67833d89ee3d912efde2eb67c8a7326 https://git.kernel.org/stable/c/d865dd6de8295f2bfaa83f0f5d49d2bef1543065