Linux Kernel up to 7.3-rc3 SMB Client smb3_enum_snapshots 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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4.1$0-$5k0.26

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3 and classified as problematic. Affected by this issue is the function smb3_enum_snapshots of the component SMB Client. The manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-98169. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as problematic. Affected is the function smb3_enum_snapshots of the component SMB Client. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential OOB read in smb3_enum_snapshots() If snapshot_array_size is smaller than GMT_TOKEN_SIZE, smb3_enum_snapshots() sets ret_data_len to sizeof(struct smb_snapshot_array) without verifying the actual length of the server's reply. Because SMB2_ioctl() places no lower bound on the server-supplied OutputCount and allocates retbuf to exactly that length, a short reply results in ret_data_len exceeding the size of retbuf. The subsequent copy_to_user() then reads past the end of retbuf, leaking adjacent slab memory to userspace. The subsequent clamp check is ineffective as it only reduces ret_data_len. Fix this by rejecting replies shorter than sizeof(struct smb_snapshot_array) with -EIO. Note that the bound is set to the 12-byte struct size rather than the 16-byte MIN_SNAPSHOT_ARRAY_SIZE defined in MS-SMB2 3.3.5.15.1, because 12 bytes is exactly what copy_to_user() attempts to read.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-98169 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/06/2026).

Upgrading to version 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 15a221c734b9d044ab769e7e3606b2cab96fb65a/74995ee8305a7c4d76ee70d6acd996a75eda3c03/210f0f1f67817e7d2348b86b5115a9b85ef5c98b/1cdf0d304d820fb13bf0faf532c3459600f9ea43/dbe452a905dfe2804647530a9ff3d7e3826ed04d/4775c3b7a597907e0b97556c7986fda238a377ae is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
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
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 6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 15a221c734b9d044ab769e7e3606b2cab96fb65a/74995ee8305a7c4d76ee70d6acd996a75eda3c03/210f0f1f67817e7d2348b86b5115a9b85ef5c98b/1cdf0d304d820fb13bf0faf532c3459600f9ea43/dbe452a905dfe2804647530a9ff3d7e3826ed04d/4775c3b7a597907e0b97556c7986fda238a377ae

Timelineinfo

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

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98169 (🔒)
GCVE (CVE): GCVE-0-2026-98169
GCVE (VulDB): GCVE-100-414096

Entryinfo

Created: 10/06/2026 12:44
Changes: 10/06/2026 12:44 (59)
Complete: 🔍
Cache ID: 216::103

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