Linux Kernel up to 7.1.3 hfs/hfsplus check_and_correct_requested_length buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k1.55-

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been classified as very critical. Impacted is the function check_and_correct_requested_length of the file hfs/hfsplus of the component hfs/hfsplus. Performing a manipulation results in buffer overflow. This vulnerability is reported as CVE-2026-64361. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.1.3. This affects the function check_and_correct_requested_length of the file hfs/hfsplus of the component hfs/hfsplus. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length check_and_correct_requested_length() compares (off + len) against node_size using u32 arithmetic. When the caller passes a large len value (e.g. from an underflowed subtraction in hfs_brec_remove()), off + len can wrap past 2^32 and produce a small result, causing the bounds check to pass when it should fail. For example, with off=14 and len=0xFFFFFFF2 (underflowed from data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6, which is less than a typical node_size of 512, so the check passes and the subsequent memmove reads ~4GB past the node buffer. Fix this by widening the addition to u64 before comparing against node_size. This prevents the u32 wrap while keeping the logic straightforward.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-64361 since 07/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch c8dd112173c02adf539fe2ad34a45f5e0068780d/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1/671c3fcc2ad31c1311ea6414382a2d95104ae1b9/b6a481642ea1977be2f84dc08c5affd742c177e7/7399c3baee7bb622a92f0b895cd4d3009a693f2b/607217f7ad419b53926f71e3f75001813bbc08ad/c25d3c931a63e762fcaa9cb125b901c53b62403f/966cb76fb2857a4242cab6ea2ea17acf818a3da7 is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
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: Buffer overflow
CWE: CWE-120 / 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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.4/7.2-rc1
Patch: c8dd112173c02adf539fe2ad34a45f5e0068780d/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1/671c3fcc2ad31c1311ea6414382a2d95104ae1b9/b6a481642ea1977be2f84dc08c5affd742c177e7/7399c3baee7bb622a92f0b895cd4d3009a693f2b/607217f7ad419b53926f71e3f75001813bbc08ad/c25d3c931a63e762fcaa9cb125b901c53b62403f/966cb76fb2857a4242cab6ea2ea17acf818a3da7

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-2026-64361 (🔒)
GCVE (CVE): GCVE-0-2026-64361
GCVE (VulDB): GCVE-100-383157

Entryinfo

Created: 07/25/2026 17:08
Changes: 07/25/2026 17:08 (60)
Complete: 🔍
Cache ID: 216::103

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