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CVE-2026-63956— USB: serial: cypress_m8: fix memory corruption with small endpoint

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，该漏洞源于中断输出端点最大数据包大小处理不当，可能导致恶意设备报告较小的大小时用户控制的slab损坏或空指针取消引用。以下版本受到影响：2.6.26版本。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3416eaa1f8f8d516b77de514e14cf8da256d28fb< 4fcb22218f0a7229b7ce3b3952fb644def293fa5 affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< ad3d1628a46134276546d7a12fedf04be9979158 affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< 52e18ae0c47c5c89e18fcd8022f287f7cc8802ec affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< 4bcaa59f403dbde6328604a500d65ee8d40975d9 affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< 1ef25704bd3b625fd151c09feee459479f71ee64 affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< 284105c40fc31fff90cdab8a0377aaeb92f87f0e affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< 6c13f3bb652bc8665e709ba07122612586aea648 affected
3416eaa1f8f8d516b77de514e14cf8da256d28fb< e1a9d791fd66ab2431b9e6f6f835823809869047 affected
… +10 more rows
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I. Basic Information for CVE-2026-63956

Vulnerability Information
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Vulnerability Title
USB: serial: cypress_m8: fix memory corruption with small endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: fix memory corruption with small endpoint Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size.
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，该漏洞源于中断输出端点最大数据包大小处理不当，可能导致恶意设备报告较小的大小时用户控制的slab损坏或空指针取消引用。以下版本受到影响：2.6.26版本。
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 3416eaa1f8f8d516b77de514e14cf8da256d28fb ~ 4fcb22218f0a7229b7ce3b3952fb644def293fa5 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-63956

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III. Intelligence Information for CVE-2026-63956

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Patches & Fixes for CVE-2026-63956 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-63994 9.8 CRITICAL tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64000 9.8 CRITICAL net: hsr: fix potential OOB access in supervision frame handling
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64007 9.8 CRITICAL netfilter: synproxy: refresh tcphdr after skb_ensure_writable
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63956

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