{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-42236", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-42236" ], "published": "2024-08-07T15:14:57Z", "summary": "usb: gadget: configfs: Prevent OOB read/write in usb_string_copy()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: configfs: Prevent OOB read/write in usb_string_copy()\n\nUserspace provided string 's' could trivially have the length zero. Left\nunchecked this will firstly result in an OOB read in the form\n`if (str[0 - 1] == '\\n') followed closely by an OOB write in the form\n`str[0 - 1] = '\\0'`.\n\nThere is already a validating check to catch strings that are too long.\nLet's supply an additional check for invalid strings that are too short.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7l", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v8", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-2712", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v6", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v8", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-2712", "binary_version": 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rule)", "upstream_fixed": "6.6.41" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-42236" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a444c3fc264119801575ab086e03fb4952f23fd0" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c95fbdde87e39e5e0ae27f28bf6711edfb985caa" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e8474a10c535e6a2024c3b06e37e4a3a23beb490" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/72b8ee0d9826e8ed00e0bdfce3e46b98419b37ce" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2d16f63d8030903e5031853e79d731ee5d474e70" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d1205033e912f9332c1dbefa812e6ceb0575ce0a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/eecfefad0953b2f31aaefa058f7f348ff39c4bba" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/6d3c721e686ea6c59e18289b400cc95c76e927e0" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerable input is a local `write(2)` to a USB gadget configfs attribute file (`/sys/kernel/config/usb_gadget/.../manufacturer`), not data from a USB peer or the network \u2014 no hardware, UDC binding, or physical access is needed.\nAC:L - A single deterministic `write(fd, \"\\0\", 1)` always drives `strlen()` to 0 and performs the `str[-1]` out-of-bounds access; there is no race and no condition outside the attacker's control, and heap grooming for the OOB write is attacker-driven via repeated gadget/string alloc-free cycles.\nPR:L - Some local access to the gadget configfs attributes is required, and these files are routinely delegated to non-root identities (Android chowns `/config/usb_gadget` to system:system for the non-root USB gadget HAL; embedded images commonly group-delegate it), so an unprivileged/low-privileged local process can reach the path.\nUI:N - The attacker performs the configfs write themselves; no victim action, mount, or interaction of any kind is needed.\nS:U - The out-of-bounds read and write stay within kernel heap memory managed by the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The bug is an out-of-bounds heap read plus heap corruption of an adjacent slab object, and such corruption is leveragable for information disclosure once the attacker grooms `kmalloc-128` to place a chosen victim object before the string buffer.\nI:H - `str[-1] = '\\0'` is a genuine out-of-bounds heap write that clears the trailing byte of the neighbouring `kmalloc-128` object \u2014 an attacker-groomable NUL-byte poisoning primitive that corrupts kernel data structures.\nA:H - The OOB access can fault on an unmapped/guard page (KFENCE, DEBUG_PAGEALLOC) or trip KASAN, and clearing a byte of an adjacent live slab object readily leads to a later oops or panic." } } }