Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3 SMB Client move_smb2_ea_to_cifs out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3. It has been classified as critical. This affects the function move_smb2_ea_to_cifs of the component SMB Client. This manipulation causes out-of-bounds. This vulnerability is tracked as CVE-2026-98170. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3. It has been declared as critical. Affected by this vulnerability is the function move_smb2_ea_to_cifs of the component SMB Client. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs() In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is insufficient. It allows iteration to continue even if the remaining src_size is too small to contain a complete smb2_ea_info structure. Consequently, reads of ea_name_length and ea_value_length can occur out-of-bounds. Fix this by ensuring src_size >= sizeof(*src) before attempting to read any structure fields. Additionally, reject any next_entry_offset that is smaller than sizeof(*src) or that would advance the pointer beyond the available buffer. Note that for calls where the server returns a malformed EA list, the error returned to userspace changes from -ENODATA (getxattr) or -ERANGE (listxattr) to -EIO. This correctly signals a server protocol error rather than misleadingly indicating "attribute not present" or "output buffer too small".

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-98170 since 09/25/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/07/2026).

Upgrading to version 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch d3546cecbf81d98bf3b472d341f981eb48c04f47/34a3942e787b9c59758115bd65fe1ec89d68c7a4/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3743). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: d3546cecbf81d98bf3b472d341f981eb48c04f47/34a3942e787b9c59758115bd65fe1ec89d68c7a4/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/07/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98170 (🔒)
GCVE (CVE): GCVE-0-2026-98170
GCVE (VulDB): GCVE-100-414097
CERT Bund: WID-SEC-2026-3743 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/06/2026 12:44
Updated: 10/07/2026 00:41
Changes: 10/06/2026 12:44 (59), 10/07/2026 00:41 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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