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CVE-2026-64361— hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于函数check_and_correct_requested_length存在u32整数溢出，导致边界检查失败，可能使memmove读取超出节点缓冲区。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 29

VendorProduct Version RangeStatus
Linux Linux 67ecc81f6492275c9c54280532f558483c99c90e< c8dd112173c02adf539fe2ad34a45f5e0068780d affected
a1a60e79502279f996e55052f50cc14919020475< fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1 affected
fe2891a9c43ab87d1a210d61e6438ca6936e2f62< 671c3fcc2ad31c1311ea6414382a2d95104ae1b9 affected
384a66b89f9540a9a8cb0f48807697dfabaece4c< b6a481642ea1977be2f84dc08c5affd742c177e7 affected
efc095b35b23297e419c2ab4fc1ed1a8f0781a29< 7399c3baee7bb622a92f0b895cd4d3009a693f2b affected
a431930c9bac518bf99d6b1da526a7f37ddee8d8< 607217f7ad419b53926f71e3f75001813bbc08ad affected
a431930c9bac518bf99d6b1da526a7f37ddee8d8< c25d3c931a63e762fcaa9cb125b901c53b62403f affected
a431930c9bac518bf99d6b1da526a7f37ddee8d8< 966cb76fb2857a4242cab6ea2ea17acf818a3da7 affected
… +21 more rows
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I. Basic Information for CVE-2026-64361

Vulnerability Information
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Vulnerability Title
hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于函数check_and_correct_requested_length存在u32整数溢出，导致边界检查失败，可能使memmove读取超出节点缓冲区。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 67ecc81f6492275c9c54280532f558483c99c90e ~ c8dd112173c02adf539fe2ad34a45f5e0068780d -
Linux Linux 6.17 -

II. Public POCs for CVE-2026-64361

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III. Intelligence Information for CVE-2026-64361

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Patches & Fixes for CVE-2026-64361 (7)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64450 9.1 CRITICAL tipc: fix out-of-bounds read in broadcast Gap ACK blocks

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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