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CVE-2026-64271— Input: touchwin - reset the packet index on every complete packet

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tw_interrupt()函数在处理Touchwindow设备数据包时，索引重置条件依赖于设备返回的Y字节相等，恶意外设可发送不等的字节导致索引持续增长，从而造成堆越界写入。

AI Predicted 5.5 Difficulty: Hard EPSS 0.17% · P6

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 11ea3173d5f2de71d037ef58ac43395795fed2bc< ed9b66905407eb3d02df1aaeed82eb7a7f0eb508 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 044167cba2384bcd783547ad5e30ecd292b30919 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 6c9f29f128dd4057404838259af4c645318487e1 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 431ad239f2924dff337c3fccb9246597c1b63185 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 70e4248793762df9832fd4fc2fc6ac7924572c36 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 3e6f007b43e2fc6546e21fa74ee62c38984a6672 affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< a8d87184576c889759e3aab899799a482f1e1a5b affected
11ea3173d5f2de71d037ef58ac43395795fed2bc< 478cdd736f2ce3114f90e775d7358136d3977b94 affected
… +10 more rows
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I. Basic Information for CVE-2026-64271

Vulnerability Information
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Vulnerability Title
Input: touchwin - reset the packet index on every complete packet
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Input: touchwin - reset the packet index on every complete packet tw_interrupt() accumulates each non-zero serial byte into a fixed three-byte buffer with a running index that is only reset once a full packet has been received *and* the device's two Y bytes agree: tw->data[tw->idx++] = data; if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { ... tw->idx = 0; } The reset is gated on tw->data[1] == tw->data[2], a value the device controls. A malicious, malfunctioning or counterfeit Touchwindow peripheral can stream non-zero bytes whose 2nd and 3rd bytes differ: the index reaches TW_LENGTH without the equality holding, is never reset, and keeps growing, so tw->data[tw->idx++] walks off the end of the three-byte array and the rest of the heap-allocated struct tw, one attacker-chosen byte at a time -- an unbounded, device-driven heap out-of-bounds write. Reset the index on every completed packet and report an event only when the two Y bytes match, like the other serio touchscreen drivers do.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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tw_interrupt()函数在处理Touchwindow设备数据包时，索引重置条件依赖于设备返回的Y字节相等，恶意外设可发送不等的字节导致索引持续增长，从而造成堆越界写入。
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 11ea3173d5f2de71d037ef58ac43395795fed2bc ~ ed9b66905407eb3d02df1aaeed82eb7a7f0eb508 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-64271

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III. Intelligence Information for CVE-2026-64271

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Patches & Fixes for CVE-2026-64271 (8)

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

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
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-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
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-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64271

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