{"id":"DEBIAN-CVE-2026-80852","details":"In the Linux kernel, the following vulnerability has been resolved:  tls: device: fix out-of-bounds write in tls_append_frag()  Found with syzkaller and a local syzbot instance running on top of a netdevsim TLS offload emulation; tls_device.c is otherwise only reachable on a machine with a NIC that implements the offload.  tls_push_data() only checks whether the open record still has room for another frag at the bottom of its loop, and the MSG_MORE early break skips that check.  The record survives to the next syscall with the frag count it already had, and tls_append_frag() does not check either, so with TLS_TX_ZEROCOPY_RO every splice(SPLICE_F_MORE) of a byte or two adds a non-coalescing pipe page and num_frags walks off the end of tls_record_info.frags[MAX_SKB_FRAGS].  Once the record is pushed, tls_push_record() runs the same index over sg_tx_data[MAX_SKB_FRAGS] and the sg_set_page() writes land on the destruct_work that follows it, which the workqueue then calls.  The byte limit is fine because copy drops to 0 and the loop falls through to the same check; the frag count has no such feedback.  Push the record rather than keep a full one open, which is what a plain TCP socket does - tcp_sendmsg_locked() uses tcp_mark_push() and new_segment in both the copy and the MSG_SPLICE_PAGES paths, and tls_sw already sets full_record when the sk_msg ring fills up, MSG_MORE or not.    BUG: KASAN: slab-out-of-bounds in tls_append_frag ( net/tls/tls_device.c:269)   Write of size 8 at addr ffff8881104d1530 by task tls_oob/450    CPU: 2 UID: 0 PID: 450 Comm: tls_oob Not tainted 7.2.0-rc7+ #329 PREEMPT   Call Trace:    \u003cTASK\u003e    dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)    print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)    kasan_report (mm/kasan/report.c:595)    tls_append_frag (net/tls/tls_device.c:269)    tls_push_data (net/tls/tls_device.c:518)    tls_device_sendmsg (net/tls/tls_device.c:583)    inet_sendmsg (net/ipv4/af_inet.c:865)    sock_sendmsg (net/socket.c:775 net/socket.c:790 net/socket.c:813)    splice_to_socket (fs/splice.c:884)    do_splice (fs/splice.c:936 fs/splice.c:1349)    __do_splice (fs/splice.c:1431)    __x64_sys_splice (fs/splice.c:1634 fs/splice.c:1616)    do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)    entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)    \u003c/TASK\u003e  and, once the record is pushed:    UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:300:24   index 18 is out of range for type 'skb_frag_t [17]'   UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:301:41   index 18 is out of range for type 'scatterlist [17]'   UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:302:39   index 18 is out of range for type 'scatterlist [17]'   UBSAN: array-index-out-of-bounds in net/tls/tls_device.c:307:38   index 26 is out of range for type 'scatterlist [17]'    kernel tried to execute NX-protected page - exploit attempt? (uid: 0)   BUG: unable to handle page fault for address: ffffea000411a680   #PF: supervisor instruction fetch in kernel mode   #PF: error_code(0x0011) - permissions violation   Oops: Oops: 0011 [#1] SMP KASAN PTI   Workqueue: ktls_device_destruct 0xffffea000411a680   RIP: 0010:0xffffea000411a680   Call Trace:    \u003cTASK\u003e    worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)    kthread (kernel/kthread.c:436)    ret_from_fork (arch/x86/kernel/process.c:158)    ret_from_fork_asm (arch/x86/entry/entry_64.S:245)    \u003c/TASK\u003e","modified":"2026-09-11T05:01:09.522666138Z","published":"2026-09-04T16:18:14.073Z","upstream":["CVE-2026-80852"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-80852"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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