Linux Kernel up to 7.1.3 decompress module_extend_max_pages Info null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k1.60-

Summaryinfo

A vulnerability labeled as very critical has been found in Linux Kernel up to 6.1.177/6.6.144/6.12.95/6.18.38/7.1.3. The affected element is the function module_extend_max_pages of the component decompress. Executing a manipulation of the argument Info can lead to null pointer dereference. This vulnerability is tracked as CVE-2026-64297. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.177/6.6.144/6.12.95/6.18.38/7.1.3. It has been declared as very critical. This vulnerability affects the function module_extend_max_pages of the component decompress. The manipulation of the argument info with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: module: decompress: check return value of module_extend_max_pages() module_extend_max_pages() calls kvrealloc() internally and returns -ENOMEM on allocation failure. The return value is never checked. If the initial allocation fails, info->pages remains NULL and info->max_pages remains 0. Subsequent calls to module_get_next_page() will attempt to dynamically grow the array by calling module_extend_max_pages(info, 0) since info->used_pages is 0. This results in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated as a success, leading to a dereference of ZERO_SIZE_PTR and a kernel oops. Fix: add the missing error check after module_extend_max_pages() and return immediately on failure. This matches the pattern used by every other kvrealloc() caller in the module loading path. [Sami: Corrected the analysis in the commit message.]

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-64297 since 07/19/2026. The exploitation appears to be easy. The attack needs to be approached locally. Additional levels of successful authentication are required 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 07/25/2026).

Upgrading to version 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch e7f174715f9f0cbcb9e87b52e4fc4ef149baac98/afcc0515bbdd28d509a2b5870faaa89b137f5d53/168072baf9ad516d5a06046514c7fea4c0671990/a82e170637e050a803b4f37542371ef216bf66d2/e7da02659c229f73492fb1ed87ceda4090153aaa/786d2d84416a9a1c1a47b71a68d679d886284be2 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
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: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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 6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: e7f174715f9f0cbcb9e87b52e4fc4ef149baac98/afcc0515bbdd28d509a2b5870faaa89b137f5d53/168072baf9ad516d5a06046514c7fea4c0671990/a82e170637e050a803b4f37542371ef216bf66d2/e7da02659c229f73492fb1ed87ceda4090153aaa/786d2d84416a9a1c1a47b71a68d679d886284be2

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64297 (🔒)
GCVE (CVE): GCVE-0-2026-64297
GCVE (VulDB): GCVE-100-383092

Entryinfo

Created: 07/25/2026 14:12
Changes: 07/25/2026 14:12 (60)
Complete: 🔍
Cache ID: 216::103

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