{
  "cveId": "CVE-2026-63895",
  "url": "https://patchblox.com/security/cve/CVE-2026-63895",
  "summary": "CVE-2026-63895 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-63895, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: f_fs: copy only received bytes on s...",
  "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 \u003E 0) \u0026\u0026 (copy_to_user(buf, data, len)))             ret = -EFAULT;  __ffs_ep0_queue_wait() returns req-\u003Eactual, 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-\u003Eactual \u003C req-\u003Elength for ep0 DATA OUT     (short-not-ok is the only ep0-OUT stall path).   * aspeed_udc ends ep0 OUT on rx_len \u003C ep-\u003Eep.maxpacket.   * renesas_usbf logs \u0022ep0 short packet\u0022 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-\u003Ereq-\u003Eactual) 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\u0027s read buffer.  Fix by copying only ret (actually received) bytes to userspace.",
  "published": "2026-07-19T16:17:06Z",
  "severity": "",
  "epss": 0.00261,
  "epssPercentile": 0.18012,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
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      "release": "sles 15.7",
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      "fix": "SUSE-SU-2026:3790-1",
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      "released": "2026-08-25T12:24:44Z"
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      "fix": "SUSE-SU-2026:23231-1",
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      "released": "2026-08-11T21:26:34Z"
    },
    {
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      "product": "kernel-azure",
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      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}