{"uuid": "4203b9e5-d8bd-493e-ad66-780ad7f56d8c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-37816", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/15493", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-37816\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nmei: vsc: Fix fortify-panic caused by invalid counted_by() use\n\ngcc 15 honors the __counted_by(len) attribute on vsc_tp_packet.buf[]\nand the vsc-tp.c code is using this in a wrong way. len does not contain\nthe available size in the buffer, it contains the actual packet length\n*without* the crc. So as soon as vsc_tp_xfer() tries to add the crc to\nbuf[] the fortify-panic handler gets triggered:\n\n[   80.842193] memcpy: detected buffer overflow: 4 byte write of buffer size 0\n[   80.842243] WARNING: CPU: 4 PID: 272 at lib/string_helpers.c:1032 __fortify_report+0x45/0x50\n...\n[   80.843175]  __fortify_panic+0x9/0xb\n[   80.843186]  vsc_tp_xfer.cold+0x67/0x67 [mei_vsc_hw]\n[   80.843210]  ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90\n[   80.843229]  ? lockdep_hardirqs_on+0x7c/0x110\n[   80.843250]  mei_vsc_hw_start+0x98/0x120 [mei_vsc]\n[   80.843270]  mei_reset+0x11d/0x420 [mei]\n\nThe easiest fix would be to just drop the counted-by but with the exception\nof the ack buffer in vsc_tp_xfer_helper() which only contains enough room\nfor the packet-header, all other uses of vsc_tp_packet always use a buffer\nof VSC_TP_MAX_XFER_SIZE bytes for the packet.\n\nInstead of just dropping the counted-by, split the vsc_tp_packet struct\ndefinition into a header and a full-packet definition and use a fixed\nsize buf[] in the packet definition, this way fortify-source buffer\noverrun checking still works when enabled.\n\ud83d\udccf Published: 2025-05-08T06:26:12.063Z\n\ud83d\udccf Modified: 2025-05-08T06:26:12.063Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/3e243378f27cc7d11682a3ad720228b0723affa5\n2. https://git.kernel.org/stable/c/ac04663c67f244810b3492e9ecd9f7cdbefeca2d\n3. https://git.kernel.org/stable/c/00f1cc14da0f06d2897b8c528df7c7dcf1b8da50", "creation_timestamp": "2025-05-08T07:23:21.000000Z"}