{"id":"DEBIAN-CVE-2025-68751","details":"In the Linux kernel, the following vulnerability has been resolved:  s390/fpu: Fix false-positive kmsan report in fpu_vstl()  A false-positive kmsan report is detected when running ping command.  An inline assembly instruction 'vstl' can write varied amount of bytes depending on value of 'index' argument. If 'index' \u003e 0, 'vstl' writes at least 2 bytes.  clang generates kmsan write helper call depending on inline assembly constraints. Constraints are evaluated compile-time, but value of 'index' argument is known only at runtime.  clang currently generates call to __msan_instrument_asm_store with 1 byte as size. Manually call kmsan function to indicate correct amount of bytes written and fix false-positive report.  This change fixes following kmsan reports:  [   36.563119] ===================================================== [   36.563594] BUG: KMSAN: uninit-value in virtqueue_add+0x35c6/0x7c70 [   36.563852]  virtqueue_add+0x35c6/0x7c70 [   36.564016]  virtqueue_add_outbuf+0xa0/0xb0 [   36.564266]  start_xmit+0x288c/0x4a20 [   36.564460]  dev_hard_start_xmit+0x302/0x900 [   36.564649]  sch_direct_xmit+0x340/0xea0 [   36.564894]  __dev_queue_xmit+0x2e94/0x59b0 [   36.565058]  neigh_resolve_output+0x936/0xb40 [   36.565278]  __neigh_update+0x2f66/0x3a60 [   36.565499]  neigh_update+0x52/0x60 [   36.565683]  arp_process+0x1588/0x2de0 [   36.565916]  NF_HOOK+0x1da/0x240 [   36.566087]  arp_rcv+0x3e4/0x6e0 [   36.566306]  __netif_receive_skb_list_core+0x1374/0x15a0 [   36.566527]  netif_receive_skb_list_internal+0x1116/0x17d0 [   36.566710]  napi_complete_done+0x376/0x740 [   36.566918]  virtnet_poll+0x1bae/0x2910 [   36.567130]  __napi_poll+0xf4/0x830 [   36.567294]  net_rx_action+0x97c/0x1ed0 [   36.567556]  handle_softirqs+0x306/0xe10 [   36.567731]  irq_exit_rcu+0x14c/0x2e0 [   36.567910]  do_io_irq+0xd4/0x120 [   36.568139]  io_int_handler+0xc2/0xe8 [   36.568299]  arch_cpu_idle+0xb0/0xc0 [   36.568540]  arch_cpu_idle+0x76/0xc0 [   36.568726]  default_idle_call+0x40/0x70 [   36.568953]  do_idle+0x1d6/0x390 [   36.569486]  cpu_startup_entry+0x9a/0xb0 [   36.569745]  rest_init+0x1ea/0x290 [   36.570029]  start_kernel+0x95e/0xb90 [   36.570348]  startup_continue+0x2e/0x40 [   36.570703] [   36.570798] Uninit was created at: [   36.571002]  kmem_cache_alloc_node_noprof+0x9e8/0x10e0 [   36.571261]  kmalloc_reserve+0x12a/0x470 [   36.571553]  __alloc_skb+0x310/0x860 [   36.571844]  __ip_append_data+0x483e/0x6a30 [   36.572170]  ip_append_data+0x11c/0x1e0 [   36.572477]  raw_sendmsg+0x1c8c/0x2180 [   36.572818]  inet_sendmsg+0xe6/0x190 [   36.573142]  __sys_sendto+0x55e/0x8e0 [   36.573392]  __s390x_sys_socketcall+0x19ae/0x2ba0 [   36.573571]  __do_syscall+0x12e/0x240 [   36.573823]  system_call+0x6e/0x90 [   36.573976] [   36.574017] Byte 35 of 98 is uninitialized [   36.574082] Memory access of size 98 starts at 0000000007aa0012 [   36.574218] [   36.574325] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.17.0-dirty #16 NONE [   36.574541] Tainted: [B]=BAD_PAGE, [N]=TEST [   36.574617] Hardware name: IBM 3931 A01 703 (KVM/Linux) [   36.574755] =====================================================  [   63.532541] ===================================================== [   63.533639] BUG: KMSAN: uninit-value in virtqueue_add+0x35c6/0x7c70 [   63.533989]  virtqueue_add+0x35c6/0x7c70 [   63.534940]  virtqueue_add_outbuf+0xa0/0xb0 [   63.535861]  start_xmit+0x288c/0x4a20 [   63.536708]  dev_hard_start_xmit+0x302/0x900 [   63.537020]  sch_direct_xmit+0x340/0xea0 [   63.537997]  __dev_queue_xmit+0x2e94/0x59b0 [   63.538819]  neigh_resolve_output+0x936/0xb40 [   63.539793]  ip_finish_output2+0x1ee2/0x2200 [   63.540784]  __ip_finish_output+0x272/0x7a0 [   63.541765]  ip_finish_output+0x4e/0x5e0 [   63.542791]  ip_output+0x166/0x410 [   63.543771]  ip_push_pending_frames+0x1a2/0x470 [   63.544753]  raw_sendmsg+0x1f06/0x2180 [   63.545033]  inet_sendmsg+0xe6/0x190 [   63.546006]  __sys_sendto+0x55e/0x8e0 ---truncated---","modified":"2026-08-27T22:48:51.016244753Z","published":"2026-01-05T10:15:56.050Z","upstream":["CVE-2025-68751"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-68751"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","7.0-1~exp1","7.0.1-1~exp1","7.0.10-1","7.0.10-1~bpo13+1","7.0.12-1","7.0.12-2","7.0.12-2~bpo13+1","7.0.13-1","7.0.13-1~bpo13+1","7.0.14-1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1","7.0.9-1~bpo13+1","7.1.1-1~exp1","7.1.10-1","7.1.2-1~exp1","7.1.3-1","7.1.3-1+sunvdc","7.1.3-1~bpo13+1","7.1.4-1","7.1.5-1","7.1.6-1","7.1.7-1","7.1.7-1~bpo13+1","7.1.8-1","7.1.8-1~bpo13+1","7.1.8-2","7.1.9-1","7.1.9-1+sparc64","7.1~rc2-1~exp1","7.1~rc3-1~exp1","7.1~rc4-1~exp1","7.1~rc4-1~exp2","7.1~rc5-1~exp1","7.1~rc7-1~exp1","7.2~rc3-1~exp1","7.2~rc5-1~exp1","7.2~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68751.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.13-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68751.json"}}],"schema_version":"1.9.0"}