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CVE-2026-63895— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.35版本存在安全漏洞，该漏洞源于ffs_ep0_read函数在短控制OUT传输时，未限制拷贝到用户空间的数据长度，导致未初始化的slab残留数据泄露给FunctionFS守护进程。

AI 预测 7.8 利用难度: 困难 EPSS 0.25% · P17

影响版本矩阵 16

厂商产品 版本范围状态
Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0< 90ccf5fb63243fae1b4b3200f3310500500ecf2e affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< af32dbb2ca0b3d09271ab718d13857a457fa16f2 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< e835bf9a055f71874065a40780ca5560b7df8b33 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 88874a19b2b093bfaaa1c0090fa536c44da8c08b affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 607730a414773a7cbe3037a64a6c64e72689ff5e affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 23c1f7deb9dd8447ecde749850676302aa1e2bd3 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 4e036c10e7f4df5d951c69cc3697bc8e209c6d02 affected
2.6.35 affected
… +8 条更多
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一、 漏洞 CVE-2026-63895 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
usb: gadget: f_fs: copy only received bytes on short ep0 read
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: copy only received bytes on short ep0 read ffs_ep0_read() allocates its control-OUT data buffer with kmalloc() (not kzalloc) at the Length value from the Setup packet, then copies that full len to userspace regardless of how many bytes were actually received: data = kmalloc(len, GFP_KERNEL); ... ret = __ffs_ep0_queue_wait(ffs, data, len); if ((ret > 0) && (copy_to_user(buf, data, len))) ret = -EFAULT; __ffs_ep0_queue_wait() returns req->actual, which on a short control OUT transfer is strictly less than len. The copy_to_user() call still copies len bytes, so on a short OUT the last (len - ret) bytes of the kmalloc() buffer -- uninitialised slab residue -- are delivered to the FunctionFS daemon. Short ep0 OUT completions are specified USB control-transfer behavior and are produced by in-tree UDCs: * dwc2 continues on req->actual < req->length for ep0 DATA OUT (short-not-ok is the only ep0-OUT stall path). * aspeed_udc ends ep0 OUT on rx_len < ep->ep.maxpacket. * renesas_usbf logs "ep0 short packet" and completes the request. * dwc3 stalls on short IN but not on short OUT. A short ep0 OUT is therefore not evidence of a broken UDC; it is a normal condition f_fs has to cope with. The sibling gadgetfs implementation in drivers/usb/gadget/legacy/inode.c already does this correctly via min(len, dev->req->actual) before copy_to_user(). This patch brings f_fs.c to the same safe pattern rather than trimming at a defensive layer. The bug is reached from the FunctionFS device node, which in real deployments is owned by the privileged gadget daemon (adbd, UMS, composite gadget services, etc.); it is not reachable from unprivileged userspace. Linux host stacks normally reject short-wLength control OUTs before they reach the gadget, so reproducing this required a build that bypasses that host-side check. With the bypass in place, a 1-byte payload on a 64-byte Setup produces 63 bytes of non-canary slab residue in the daemon's read buffer. Fix by copying only ret (actually received) bytes to userspace.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.35版本存在安全漏洞，该漏洞源于ffs_ep0_read函数在短控制OUT传输时，未限制拷贝到用户空间的数据长度，导致未初始化的slab残留数据泄露给FunctionFS守护进程。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0 ~ 90ccf5fb63243fae1b4b3200f3310500500ecf2e -
Linux Linux 2.6.35 -

二、漏洞 CVE-2026-63895 的公开POC

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三、漏洞 CVE-2026-63895 的情报信息

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CVE-2026-63895 补丁与修复 (7)

同批安全公告 · Linux · 2026-07-19 · 共 429 条

CVE-2026-63795 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-64056 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63886 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53399 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-53398 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63984 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63922 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64035 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64150 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63924 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63979 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63800 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64037 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63978 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64132 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63825 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-63857 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64113 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64016 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64162 9.8 CRITICAL Linux kernel 安全漏洞

显示前 20 条，共 429 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63895

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