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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncalipso: Fix null-ptr-deref in calipso_req_{set,del}attr().\n\nsyzkaller reported a null-ptr-deref in sock_omalloc() while allocating\na CALIPSO option.  [0]\n\nThe NULL is of struct sock, which was fetched by sk_to_full_sk() in\ncalipso_req_setattr().\n\nSince commit a1a5344ddbe8 (\"tcp: avoid two atomic ops for syncookies\"),\nreqsk-\u003ersk_listener could be NULL when SYN Cookie is returned to its\nclient, as hinted by the leading SYN Cookie log.\n\nHere are 3 options to fix the bug:\n\n  1) Return 0 in calipso_req_setattr()\n  2) Return an error in calipso_req_setattr()\n  3) Alaways set rsk_listener\n\n1) is no go as it bypasses LSM, but 2) effectively disables SYN Cookie\nfor CALIPSO.  3) is also no go as there have been many efforts to reduce\natomic ops and make TCP robust against DDoS.  See also commit 3b24d854cb35\n(\"tcp/dccp: do not touch listener sk_refcnt under synflood\").\n\nAs of the blamed commit, SYN Cookie already did not need refcounting,\nand no one has stumbled on the bug for 9 years, so no CALIPSO user will\ncare about SYN Cookie.\n\nLet\u0027s return an error in calipso_req_setattr() and calipso_req_delattr()\nin the SYN Cookie case.\n\nThis can be reproduced by [1] on Fedora and now connect() of nc times out.\n\n[0]:\nTCP: request_sock_TCPv6: Possible SYN flooding on port [::]:20002. Sending cookies.\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\nCPU: 3 UID: 0 PID: 12262 Comm: syz.1.2611 Not tainted 6.14.0 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nRIP: 0010:read_pnet include/net/net_namespace.h:406 [inline]\nRIP: 0010:sock_net include/net/sock.h:655 [inline]\nRIP: 0010:sock_kmalloc+0x35/0x170 net/core/sock.c:2806\nCode: 89 d5 41 54 55 89 f5 53 48 89 fb e8 25 e3 c6 fd e8 f0 91 e3 00 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02 00 0f 85 26 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b\nRSP: 0018:ffff88811af89038 EFLAGS: 00010216\nRAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888105266400\nRDX: 0000000000000006 RSI: ffff88800c890000 RDI: 0000000000000030\nRBP: 0000000000000050 R08: 0000000000000000 R09: ffff88810526640e\nR10: ffffed1020a4cc81 R11: ffff88810526640f R12: 0000000000000000\nR13: 0000000000000820 R14: ffff888105266400 R15: 0000000000000050\nFS:  00007f0653a07640(0000) GS:ffff88811af80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f863ba096f4 CR3: 00000000163c0005 CR4: 0000000000770ef0\nPKRU: 80000000\nCall Trace:\n \u003cIRQ\u003e\n ipv6_renew_options+0x279/0x950 net/ipv6/exthdrs.c:1288\n calipso_req_setattr+0x181/0x340 net/ipv6/calipso.c:1204\n calipso_req_setattr+0x56/0x80 net/netlabel/netlabel_calipso.c:597\n netlbl_req_setattr+0x18a/0x440 net/netlabel/netlabel_kapi.c:1249\n selinux_netlbl_inet_conn_request+0x1fb/0x320 security/selinux/netlabel.c:342\n selinux_inet_conn_request+0x1eb/0x2c0 security/selinux/hooks.c:5551\n security_inet_conn_request+0x50/0xa0 security/security.c:4945\n tcp_v6_route_req+0x22c/0x550 net/ipv6/tcp_ipv6.c:825\n tcp_conn_request+0xec8/0x2b70 net/ipv4/tcp_input.c:7275\n tcp_v6_conn_request+0x1e3/0x440 net/ipv6/tcp_ipv6.c:1328\n tcp_rcv_state_process+0xafa/0x52b0 net/ipv4/tcp_input.c:6781\n tcp_v6_do_rcv+0x8a6/0x1a40 net/ipv6/tcp_ipv6.c:1667\n tcp_v6_rcv+0x505e/0x5b50 net/ipv6/tcp_ipv6.c:1904\n ip6_protocol_deliver_rcu+0x17c/0x1da0 net/ipv6/ip6_input.c:436\n ip6_input_finish+0x103/0x180 net/ipv6/ip6_input.c:480\n NF_HOOK include/linux/netfilter.h:314 [inline]\n NF_HOOK include/linux/netfilter.h:308 [inline]\n ip6_input+0x13c/0x6b0 net/ipv6/ip6_input.c:491\n dst_input include/net/dst.h:469 [inline]\n ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]\n ip6_rcv_finish+0xb6/0x490 net/ipv6/ip6_input.c:69\n NF_HOOK include/linux/netfilter.h:314 [inline]\n NF_HOOK include/linux/netf\n---truncated---"
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              "value": "AV:N - The crash is reached purely from an inbound IPv6 TCP SYN processed in `tcp_v6_rcv` \u2192 `tcp_conn_request` \u2192 `tcp_v6_route_req` \u2192 `calipso_req_setattr`, with no local access required. CALIPSO labeled networking exists specifically to carry labels between remote peers over routed IPv6, so any remote host that can reach the listening port can trigger it.\nAC:L - The only precondition beyond sending SYNs is that SYN cookies be active, and the attacker creates that condition themselves by SYN-flooding the listener until `inet_csk_reqsk_queue_is_full()` (default `tcp_syncookies=1`), or it is permanently on with `=2`. No race, no memory-layout dependency, no information the attacker must first obtain \u2014 the oops reproduces deterministically on every cookie-mode SYN.\nPR:N - The vulnerable code runs inside `tcp_conn_request()` while handling the very first packet of a connection, long before any TCP handshake completes or any application-level authentication occurs. The attacker needs no account, credentials, or socket on the target.\nUI:N - Processing happens in the softirq receive path with no involvement of any local user or process. Merely having an IPv6 TCP listener with a CALIPSO NetLabel mapping is enough.\nS:U - The fault is a kernel dereference handled within the kernel\u0027s own security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - `sock_kmalloc(NULL, ...)` faults on a read of a fixed low offset (~0x30) off a NULL pointer that the attacker cannot displace or control, and the faulting value is never returned to the attacker. No memory contents are disclosed.\nI:N - The bug is a NULL-pointer read that aborts before any store; the subsequent writes (`memset(opt2,...)`, `xchg`, `atomic_sub`) are never reached because the allocation faults first. There is no out-of-bounds or freed-object write and hence no control-flow or data corruption primitive.\nA:H - The NULL dereference occurs in NAPI/softirq context, where the resulting oops is a fatal exception in interrupt context and panics the machine \u2014 the reporter\u0027s reproducer shows a GPF taking down the kernel. An unauthenticated remote attacker can repeat it at will, giving complete loss of availability."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: ensure the allocated report buffer can contain the reserved report ID\n\nWhen the report ID is not used, the low level transport drivers expect\nthe first byte to be 0. However, currently the allocated buffer not\naccount for that extra byte, meaning that instead of having 8 guaranteed\nbytes for implement to be working, we only have 7."
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              "value": "AV:A - The undersized buffer is driven entirely by the device-supplied HID report descriptor (report-\u003eid == 0 plus a chosen report-\u003esize), and the Bluetooth HIDP transport is itself one of the consumers that writes the reserved report-ID byte into it (`data[0] = report_number` in hidp_get_raw_report()/hidp_set_raw_report()); a malicious or spoofed BR/EDR HID peripheral, or a BLE HoG device whose descriptor bluetoothd forwards into uhid, controls this from radio range. USB HID is an additional but strictly less severe (physical) path.\nAC:L - The attacker fully and deterministically controls both trigger conditions through the report descriptor \u2014 declaring an unnumbered (ID 0) report and picking a size so that hid_report_len(report)+7 lands exactly on a kmalloc slab-size boundary \u2014 with no race to win and no dependence on state the attacker cannot influence.\nPR:N - A HID peripheral needs no credentials or account on the target; the report descriptor is fetched and parsed, and feature/output reports are requested, automatically during device setup and driver probe (hid_hw_request(), mt_get_feature(), the hidinput LED worker, etc.).\nUI:N - Descriptor parsing and the subsequent report requests happen automatically during HID device enumeration and probe, with no action required from a logged-in user; an already-paired or reconnecting Bluetooth HID device reaches the code with no interaction at all.\nS:U - The under-allocation and the resulting heap corruption are both confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The buffer is one byte short of its documented contract in both directions, so on GET_REPORT paths adjacent slab bytes are mixed into data fed back through hid_report_raw_event() and into driver reads such as hid-steam\u0027s `memcpy(data, buf + 1, ...)`; per kernel scoring guidance, heap corruption of this kind is leverageable for information disclosure.\nI:H - This is an out-of-bounds heap write of attacker-influenced report data one byte past a kmalloc\u0027d object, and because the attacker picks the report size they can align the allocation to a slab boundary so the overflow lands in the adjacent object \u2014 a classic primitive for control-flow hijacking via heap grooming.\nA:H - Corrupting the neighbouring slab object (or its metadata) readily produces oopses, slab corruption panics, and KASAN-detected slab-out-of-bounds aborts, and the attacking peripheral can retrigger it at will by reconnecting."
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