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CVE-2026-63957— USB: serial: safe_serial: 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USB串行驱动程序中bulk-out缓冲区大小不足，可能导致恶意设备利用较小报告尺寸在“safe”模式下造成用户控制的slab内存损坏。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e3a1d6eee25dc96b1d2db0ecd9d8741e92056476 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c7336c0fba5c959249f3d793d33076b992ec3ee4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 161ea0e5236f5f051d2d85d6c54dd08ee9dc7ba4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9b3145b3001fb24de1da72d1deb0bea70e5a078b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a550ed2117ca4709d38f713933ff924a83942e41 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f793b67d41e5fab719c5a90baa77cbd2fe259517 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 857b3cc73f91871ae4433f8b97c4670b78f8dc96 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 438061ed1ad85e6743e2dce826671772d81089ec affected
… +10 more rows
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I. Basic Information for CVE-2026-63957

Vulnerability Information
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Vulnerability Title
USB: serial: safe_serial: 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: safe_serial: fix memory corruption with small endpoint Make sure that the bulk-out buffer size is at least eight bytes to avoid user-controlled slab corruption in "safe" mode 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USB串行驱动程序中bulk-out缓冲区大小不足，可能导致恶意设备利用较小报告尺寸在“safe”模式下造成用户控制的slab内存损坏。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e3a1d6eee25dc96b1d2db0ecd9d8741e92056476 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-63957

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III. Intelligence Information for CVE-2026-63957

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Patches & Fixes for CVE-2026-63957 (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-2026-63957

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