Linux Kernel up to 7.1.4 spi-nor unlock params/size locking

CVSS Meta Temp Score
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CTI Interest Score
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8.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.1.177/6.6.144/6.12.96/6.18.39/7.1.4. Affected by this vulnerability is the function Unlock of the component spi-nor. The manipulation of the argument params/size results in locking. This vulnerability was named CVE-2026-72155. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.177/6.6.144/6.12.96/6.18.39/7.1.4. It has been classified as very critical. Affected is the function unlock of the component spi-nor. The manipulation of the argument params/size with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: swp: Improve locking user experience In the case of the first block being locked (or the few first blocks), if the user want to fully unlock the device it has two possibilities: - either it asks to unlock the entire device, and this works; - or it asks to unlock just the block(s) that are currently locked, which fails. It fails because the conditions "can_be_top" and "can_be_bottom" are true. Indeed, in this case, we unlock everything, so the TB bit does not matter. However in the current implementation, use_top would be true (as this is the favourite option) and lock_len, which in practice should be reduced down to 0, is set to "nor->params->size - (ofs + len)" which is a positive number. This is wrong. An easy way is to simply add an extra condition. In the unlock() path, if we can achieve the same result from both sides, it means we unlock everything and lock_len must simply be 0. A comment is added to clarify that logic.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-72155 since 08/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are necessary for exploitation. 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 08/15/2026).

Upgrading to version 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 9a0d8dec3d11ca95d67537ea8fa6ee2730a5038a/dc341272cf8e15a2c511db3c4df5dab8adf70ad0/6110ab5ffd84e8daa654652446a03ce2f77580a7/c0806df5cf806545160f3fdac3c888926ceac557/12d4d69221159e6d0e72400ec81195d691169b53/e1d456b26bf23e30db305a6184e8abd9ab68bbf2 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

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Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 9a0d8dec3d11ca95d67537ea8fa6ee2730a5038a/dc341272cf8e15a2c511db3c4df5dab8adf70ad0/6110ab5ffd84e8daa654652446a03ce2f77580a7/c0806df5cf806545160f3fdac3c888926ceac557/12d4d69221159e6d0e72400ec81195d691169b53/e1d456b26bf23e30db305a6184e8abd9ab68bbf2

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72155 (🔒)
GCVE (CVE): GCVE-0-2026-72155
GCVE (VulDB): GCVE-100-390588

Entryinfo

Created: 08/15/2026 13:05
Changes: 08/15/2026 13:05 (60)
Complete: 🔍
Cache ID: 216::103

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