{"id":"CVE-2023-53344","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-53344","generatedAt":"2026-10-28T02:16:59.408Z","title":"In the Linux kernel, the following vulnerability has been resolved: can: bcm: bcm_tx_setup(): fix KMSAN uninit-value in vfs_write Syzkaller reported the following issue: ===================================================== BUG: KMSAN: uninit-value in…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: bcm_tx_setup(): fix KMSAN uninit-value in vfs_write\n\nSyzkaller reported the following issue:\n\n=====================================================\nBUG: KMSAN: uninit-value in aio_rw_done fs/aio.c:1520 [inline]\nBUG: KMSAN: uninit-value in aio_write+0x899/0x950 fs/aio.c:1600\n aio_rw_done fs/aio.c:1520 [inline]\n aio_write+0x899/0x950 fs/aio.c:1600\n io_submit_one+0x1d1c/0x3bf0 fs/aio.c:2019\n __do_sys_io_submit fs/aio.c:2078 [inline]\n __se_sys_io_submit+0x293/0x770 fs/aio.c:2048\n __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2048\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nUninit was created at:\n slab_post_alloc_hook mm/slab.h:766 [inline]\n slab_alloc_node mm/slub.c:3452 [inline]\n __kmem_cache_alloc_node+0x71f/0xce0 mm/slub.c:3491\n __do_kmalloc_node mm/slab_common.c:967 [inline]\n __kmalloc+0x11d/0x3b0 mm/slab_common.c:981\n kmalloc_array include/linux/slab.h:636 [inline]\n bcm_tx_setup+0x80e/0x29d0 net/can/bcm.c:930\n bcm_sendmsg+0x3a2/0xce0 net/can/bcm.c:1351\n sock_sendmsg_nosec net/socket.c:714 [inline]\n sock_sendmsg net/socket.c:734 [inline]\n sock_write_iter+0x495/0x5e0 net/socket.c:1108\n call_write_iter include/linux/fs.h:2189 [inline]\n aio_write+0x63a/0x950 fs/aio.c:1600\n io_submit_one+0x1d1c/0x3bf0 fs/aio.c:2019\n __do_sys_io_submit fs/aio.c:2078 [inline]\n __se_sys_io_submit+0x293/0x770 fs/aio.c:2048\n __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2048\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nCPU: 1 PID: 5034 Comm: syz-executor350 Not tainted 6.2.0-rc6-syzkaller-80422-geda666ff2276 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023\n=====================================================\n\nWe can follow the call chain and find that 'bcm_tx_setup' function\ncalls 'memcpy_from_msg' to copy some content to the newly allocated\nframe of 'op->frames'. After that the 'len' field of copied structure\nbeing compared with some constant value (64 or 8). However, if\n'memcpy_from_msg' returns an error, we will compare some uninitialized\nmemory. This triggers 'uninit-value' issue.\n\nThis patch will add 'memcpy_from_msg' possible errors processing to\navoid uninit-value issue.\n\nTested via syzkaller","published":"2025-09-17T15:15:38.000Z","lastModified":"2026-06-17T06:44:57.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-908"],"affected":["linux/linux kernel"],"epss":{"score":0.00203,"percentile":0.10141,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/2b4c99f7d9a57ecd644eda9b1fb0a1072414959f","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2e6ad51c709fa794e0ce26003c9c9cd944e3383a","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3fa0f1e0e31b1b73cdf59d4c36c7242e6ef821be","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/618b15d09fed6126356101543451d49860db4388","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/78bc7f0ab99458221224d3ab97199c0f8e6861f1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ab2a55907823f0bca56b6d03ea05e4071ba8535f","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bf70e0eab64c625da84d9fdf4e84466b79418920","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c11dbc7705b3739974ac31a13f4ab81e61a5fb07","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-53344","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}