What is the CVSS score of EUVD-2026-18688?

EUVD-2026-18688 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-18688?

Yes, a patch is available for EUVD-2026-18688. Update the affected software to the latest version immediately.

Linux EUVD-2026-18688

| CVE-2026-23444 HIGH

Memory Leak (CWE-401)

2026-04-03 Linux

Linux Information Disclosure

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

SUSE

5.5 MEDIUM

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

Red Hat

5.5 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 27, 2026 - 14:22 vuln.today

cvss_changed

Severity Changed

Apr 27, 2026 - 14:22 NVD

MEDIUM HIGH

CVSS changed

Apr 27, 2026 - 14:22 NVD

5.5 (MEDIUM) 7.8 (HIGH)

CVSS changed

Apr 23, 2026 - 21:11 NVD

5.5 (MEDIUM)

Patch available

Apr 16, 2026 - 05:29 EUVD

50f1b690b4868923fbd242298def2fb88662f108,06e769dddcbeb3baf2ce346273b53dd61fdbecf4

EUVD ID Assigned

Apr 03, 2026 - 15:30 euvd

EUVD-2026-18688

Analysis Generated

Apr 03, 2026 - 15:30 vuln.today

CVE Published

Apr 03, 2026 - 15:15 nvd

N/A

DescriptionCVE.org

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

wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

ieee80211_tx_prepare_skb() has three error paths, but only two of them free the skb. The first error path (ieee80211_tx_prepare() returning TX_DROP) does not free it, while invoke_tx_handlers() failure and the fragmentation check both do.

Add kfree_skb() to the first error path so all three are consistent, and remove the now-redundant frees in callers (ath9k, mt76, mac80211_hwsim) to avoid double-free.

Document the skb ownership guarantee in the function's kdoc.

AnalysisAI

Memory leak in Linux kernel mac80211 subsystem's ieee80211_tx_prepare_skb() function fails to free socket buffers (skb) in one of three error paths, allowing local denial of service through memory exhaustion. The vulnerability affects all Linux kernel versions with the vulnerable code path in wireless MAC 802.11 handling; no active exploitation has been reported, but the fix addresses a resource leak that could be triggered by applications exercising error conditions in Wi-Fi frame preparation.

Technical ContextAI

The ieee80211_tx_prepare_skb() function in the Linux kernel's mac80211 (802.11 MAC layer) subsystem prepares wireless frames for transmission. The function has three distinct error handling paths: one where ieee80211_tx_prepare() returns TX_DROP status, one where invoke_tx_handlers() fails, and one where fragmentation validation fails. Socket buffer (skb) objects in Linux networking represent packet data and must be explicitly freed to prevent memory leaks. The vulnerability stems from inconsistent error handling where only two of the three error paths call kfree_skb(), leaving the first path to leak the allocated skb object. This impacts the entire Linux kernel's Wi-Fi stack, including drivers like Qualcomm Atheros (ath9k), MediaTek (mt76), and the mac80211_hwsim simulation driver, all of which previously worked around this inconsistency by redundantly freeing skbs at their call sites.

RemediationAI

Apply the Linux kernel patches from the referenced commits to ieee80211_tx_prepare_skb() in net/mac80211/tx.c. The primary fix adds kfree_skb() to the first error path (when ieee80211_tx_prepare() returns TX_DROP) and removes redundant kfree_skb() calls from caller functions in ath9k, mt76, and mac80211_hwsim to eliminate double-free risk. Affected distributors should backport commit 06e769dddcbeb3baf2ce346273b53dd61fdbecf4 (or equivalent patches 50f1b690b4868923fbd242298def2fb88662f108 and d5ad6ab61cbd89afdb60881f6274f74328af3ee9) to their supported stable kernel branches. Users running affected kernel versions should update to a patched kernel version; interim mitigation is not practical for this code path. References: https://git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4

Same weakness CWE-401 – Memory Leak

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Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7	Fixed

EUVD-2026-18688 vulnerability details – vuln.today

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Linux EUVD-2026-18688

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

Same weakness CWE-401 – Memory Leak

Same technique Information Disclosure

Vendor StatusVendor

SUSE

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External POC / Exploit Code