{"id":"DEBIAN-CVE-2023-53344","details":"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 aio_rw_done fs/aio.c:1520 [inline] BUG: KMSAN: uninit-value in aio_write+0x899/0x950 fs/aio.c:1600  aio_rw_done fs/aio.c:1520 [inline]  aio_write+0x899/0x950 fs/aio.c:1600  io_submit_one+0x1d1c/0x3bf0 fs/aio.c:2019  __do_sys_io_submit fs/aio.c:2078 [inline]  __se_sys_io_submit+0x293/0x770 fs/aio.c:2048  __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2048  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x63/0xcd  Uninit was created at:  slab_post_alloc_hook mm/slab.h:766 [inline]  slab_alloc_node mm/slub.c:3452 [inline]  __kmem_cache_alloc_node+0x71f/0xce0 mm/slub.c:3491  __do_kmalloc_node mm/slab_common.c:967 [inline]  __kmalloc+0x11d/0x3b0 mm/slab_common.c:981  kmalloc_array include/linux/slab.h:636 [inline]  bcm_tx_setup+0x80e/0x29d0 net/can/bcm.c:930  bcm_sendmsg+0x3a2/0xce0 net/can/bcm.c:1351  sock_sendmsg_nosec net/socket.c:714 [inline]  sock_sendmsg net/socket.c:734 [inline]  sock_write_iter+0x495/0x5e0 net/socket.c:1108  call_write_iter include/linux/fs.h:2189 [inline]  aio_write+0x63a/0x950 fs/aio.c:1600  io_submit_one+0x1d1c/0x3bf0 fs/aio.c:2019  __do_sys_io_submit fs/aio.c:2078 [inline]  __se_sys_io_submit+0x293/0x770 fs/aio.c:2048  __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2048  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x63/0xcd  CPU: 1 PID: 5034 Comm: syz-executor350 Not tainted 6.2.0-rc6-syzkaller-80422-geda666ff2276 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 =====================================================  We can follow the call chain and find that 'bcm_tx_setup' function calls 'memcpy_from_msg' to copy some content to the newly allocated frame of 'op-\u003eframes'. After that the 'len' field of copied structure being compared with some constant value (64 or 8). However, if 'memcpy_from_msg' returns an error, we will compare some uninitialized memory. This triggers 'uninit-value' issue.  This patch will add 'memcpy_from_msg' possible errors processing to avoid uninit-value issue.  Tested via syzkaller","modified":"2026-09-15T09:02:43.986996804Z","published":"2025-09-17T15:15:38.237Z","upstream":["CVE-2023-53344"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53344"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53344.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53344.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53344.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}