Linux Kernel up to 6.10.4 pti_clone_pgtable stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.10.4. This affects the function pti_clone_pgtable. This manipulation causes stack-based overflow. This vulnerability appears as CVE-2024-44965. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.10.4. Affected by this vulnerability is the function pti_clone_pgtable. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). 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: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386. These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text? Use the correct increment form for addr to avoid alignment assumptions.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2024-44965 since 08/21/2024. The exploitation appears to be easy. 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 10/15/2024).

The vulnerability scanner Nessus provides a plugin with the ID 208953 (Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2024-12780)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.320, 5.4.282, 5.10.224, 5.15.165, 6.1.105, 6.6.46 or 6.10.5 eliminates this vulnerability. Applying the patch 18da1b27ce16/25a727233a40/d00c9b4bbc44/4d143ae78200/5c580c1050bc/ca07aab70dd3/df3eecb5496f/41e71dbb0e0a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (208953). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 208953
Nessus Name: Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2024-12780)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.19.320/5.4.282/5.10.224/5.15.165/6.1.105/6.6.46/6.10.5
Patch: 18da1b27ce16/25a727233a40/d00c9b4bbc44/4d143ae78200/5c580c1050bc/ca07aab70dd3/df3eecb5496f/41e71dbb0e0a

Timelineinfo

08/21/2024 🔍
09/04/2024 +14 days 🔍
09/04/2024 +0 days 🔍
10/15/2024 +40 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-44965 (🔍)
GCVE (CVE): GCVE-0-2024-44965
GCVE (VulDB): GCVE-100-276553

Entryinfo

Created: 09/04/2024 21:52
Updated: 10/15/2024 01:51
Changes: 09/04/2024 21:52 (58), 09/06/2024 08:00 (1), 10/04/2024 21:48 (11), 10/15/2024 01:51 (2)
Complete: 🔍
Cache ID: 216::103

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

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