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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: cleanup mana struct after debugfs_remove()\n\nWhen on a MANA VM hibernation is triggered, as part of hibernate_snapshot(),\nmana_gd_suspend() and mana_gd_resume() are called. If during this\nmana_gd_resume(), a failure occurs with HWC creation, mana_port_debugfs\npointer does not get reinitialized and ends up pointing to older,\ncleaned-up dentry.\nFurther in the hibernation path, as part of power_down(), mana_gd_shutdown()\nis triggered. This call, unaware of the failures in resume, tries to cleanup\nthe already cleaned up  mana_port_debugfs value and hits the following bug:\n\n[  191.359296] mana 7870:00:00.0: Shutdown was called\n[  191.359918] BUG: kernel NULL pointer dereference, address: 0000000000000098\n[  191.360584] #PF: supervisor write access in kernel mode\n[  191.361125] #PF: error_code(0x0002) - not-present page\n[  191.361727] PGD 1080ea067 P4D 0\n[  191.362172] Oops: Oops: 0002 [#1] SMP NOPTI\n[  191.362606] CPU: 11 UID: 0 PID: 1674 Comm: bash Not tainted 6.14.0-rc5+ #2\n[  191.363292] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/21/2024\n[  191.364124] RIP: 0010:down_write+0x19/0x50\n[  191.364537] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 de cd ff ff 31 c0 ba 01 00 00 00 \u003cf0\u003e 48 0f b1 13 75 16 65 48 8b 05 88 24 4c 6a 48 89 43 08 48 8b 5d\n[  191.365867] RSP: 0000:ff45fbe0c1c037b8 EFLAGS: 00010246\n[  191.366350] RAX: 0000000000000000 RBX: 0000000000000098 RCX: ffffff8100000000\n[  191.366951] RDX: 0000000000000001 RSI: 0000000000000064 RDI: 0000000000000098\n[  191.367600] RBP: ff45fbe0c1c037c0 R08: 0000000000000000 R09: 0000000000000001\n[  191.368225] R10: ff45fbe0d2b01000 R11: 0000000000000008 R12: 0000000000000000\n[  191.368874] R13: 000000000000000b R14: ff43dc27509d67c0 R15: 0000000000000020\n[  191.369549] FS:  00007dbc5001e740(0000) GS:ff43dc663f380000(0000) knlGS:0000000000000000\n[  191.370213] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  191.370830] CR2: 0000000000000098 CR3: 0000000168e8e002 CR4: 0000000000b73ef0\n[  191.371557] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  191.372192] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400\n[  191.372906] Call Trace:\n[  191.373262]  \u003cTASK\u003e\n[  191.373621]  ? show_regs+0x64/0x70\n[  191.374040]  ? __die+0x24/0x70\n[  191.374468]  ? page_fault_oops+0x290/0x5b0\n[  191.374875]  ? do_user_addr_fault+0x448/0x800\n[  191.375357]  ? exc_page_fault+0x7a/0x160\n[  191.375971]  ? asm_exc_page_fault+0x27/0x30\n[  191.376416]  ? down_write+0x19/0x50\n[  191.376832]  ? down_write+0x12/0x50\n[  191.377232]  simple_recursive_removal+0x4a/0x2a0\n[  191.377679]  ? __pfx_remove_one+0x10/0x10\n[  191.378088]  debugfs_remove+0x44/0x70\n[  191.378530]  mana_detach+0x17c/0x4f0\n[  191.378950]  ? __flush_work+0x1e2/0x3b0\n[  191.379362]  ? __cond_resched+0x1a/0x50\n[  191.379787]  mana_remove+0xf2/0x1a0\n[  191.380193]  mana_gd_shutdown+0x3b/0x70\n[  191.380642]  pci_device_shutdown+0x3a/0x80\n[  191.381063]  device_shutdown+0x13e/0x230\n[  191.381480]  kernel_power_off+0x35/0x80\n[  191.381890]  hibernate+0x3c6/0x470\n[  191.382312]  state_store+0xcb/0xd0\n[  191.382734]  kobj_attr_store+0x12/0x30\n[  191.383211]  sysfs_kf_write+0x3e/0x50\n[  191.383640]  kernfs_fop_write_iter+0x140/0x1d0\n[  191.384106]  vfs_write+0x271/0x440\n[  191.384521]  ksys_write+0x72/0xf0\n[  191.384924]  __x64_sys_write+0x19/0x20\n[  191.385313]  x64_sys_call+0x2b0/0x20b0\n[  191.385736]  do_syscall_64+0x79/0x150\n[  191.386146]  ? __mod_memcg_lruvec_state+0xe7/0x240\n[  191.386676]  ? __lruvec_stat_mod_folio+0x79/0xb0\n[  191.387124]  ? __pfx_lru_add+0x10/0x10\n[  191.387515]  ? queued_spin_unlock+0x9/0x10\n[  191.387937]  ? do_anonymous_page+0x33c/0xa00\n[  191.388374]  ? __handle_mm_fault+0xcf3/0x1210\n[  191.388805]  ? __count_memcg_events+0xbe/0x180\n[  191.389235]  ? handle_mm_fault+0xae/0x300\n[  19\n---truncated---"
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        {
          "url": "https://git.kernel.org/stable/c/3d8c6f26893d55fab218ad086719de1fc9bb86ba"
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    "dateUpdated": "2025-05-04T07:23:20.708Z",
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()\n\nWhen performing an iSCSI boot using IPv6, iscsistart still reads the\n/sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix\nlength is 64, this causes the shift exponent to become negative,\ntriggering a UBSAN warning. As the concept of a subnet mask does not\napply to IPv6, the value is set to ~0 to suppress the warning message."
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        {
          "url": "https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5"
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      "title": "iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()",
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    "dateReserved": "2024-12-29T08:45:45.801Z",
    "dateUpdated": "2025-10-01T17:13:24.916Z",
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              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: fix race between cancel_hw_scan and hw_scan completion\n\nThe rtwdev-\u003escanning flag isn\u0027t protected by mutex originally, so\ncancel_hw_scan can pass the condition, but suddenly hw_scan completion\nunset the flag and calls ieee80211_scan_completed() that will free\nlocal-\u003ehw_scan_req. Then, cancel_hw_scan raises null-ptr-deref and\nuse-after-free. Fix it by moving the check condition to where\nprotected by mutex.\n\n KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]\n CPU: 2 PID: 6922 Comm: kworker/2:2 Tainted: G           OE\n Hardware name: LENOVO 2356AD1/2356AD1, BIOS G7ETB6WW (2.76 ) 09/10/2019\n Workqueue: events cfg80211_conn_work [cfg80211]\n RIP: 0010:rtw89_fw_h2c_scan_offload_be+0xc33/0x13c3 [rtw89_core]\n Code: 00 45 89 6c 24 1c 0f 85 23 01 00 00 48 8b 85 20 ff ff ff 48 8d\n RSP: 0018:ffff88811fd9f068 EFLAGS: 00010206\n RAX: dffffc0000000000 RBX: ffff88811fd9f258 RCX: 0000000000000001\n RDX: 0000000000000011 RSI: 0000000000000001 RDI: 0000000000000089\n RBP: ffff88811fd9f170 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff88811fd9f108 R11: 0000000000000000 R12: ffff88810e47f960\n R13: 0000000000000000 R14: 000000000000ffff R15: 0000000000000000\n FS:  0000000000000000(0000) GS:ffff8881d6f00000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007531dfca55b0 CR3: 00000001be296004 CR4: 00000000001706e0\n Call Trace:\n  \u003cTASK\u003e\n  ? show_regs+0x61/0x73\n  ? __die_body+0x20/0x73\n  ? die_addr+0x4f/0x7b\n  ? exc_general_protection+0x191/0x1db\n  ? asm_exc_general_protection+0x27/0x30\n  ? rtw89_fw_h2c_scan_offload_be+0xc33/0x13c3 [rtw89_core]\n  ? rtw89_fw_h2c_scan_offload_be+0x458/0x13c3 [rtw89_core]\n  ? __pfx_rtw89_fw_h2c_scan_offload_be+0x10/0x10 [rtw89_core]\n  ? do_raw_spin_lock+0x75/0xdb\n  ? __pfx_do_raw_spin_lock+0x10/0x10\n  rtw89_hw_scan_offload+0xb5e/0xbf7 [rtw89_core]\n  ? _raw_spin_unlock+0xe/0x24\n  ? __mutex_lock.constprop.0+0x40c/0x471\n  ? __pfx_rtw89_hw_scan_offload+0x10/0x10 [rtw89_core]\n  ? __mutex_lock_slowpath+0x13/0x1f\n  ? mutex_lock+0xa2/0xdc\n  ? __pfx_mutex_lock+0x10/0x10\n  rtw89_hw_scan_abort+0x58/0xb7 [rtw89_core]\n  rtw89_ops_cancel_hw_scan+0x120/0x13b [rtw89_core]\n  ieee80211_scan_cancel+0x468/0x4d0 [mac80211]\n  ieee80211_prep_connection+0x858/0x899 [mac80211]\n  ieee80211_mgd_auth+0xbea/0xdde [mac80211]\n  ? __pfx_ieee80211_mgd_auth+0x10/0x10 [mac80211]\n  ? cfg80211_find_elem+0x15/0x29 [cfg80211]\n  ? is_bss+0x1b7/0x1d7 [cfg80211]\n  ieee80211_auth+0x18/0x27 [mac80211]\n  cfg80211_mlme_auth+0x3bb/0x3e7 [cfg80211]\n  cfg80211_conn_do_work+0x410/0xb81 [cfg80211]\n  ? __pfx_cfg80211_conn_do_work+0x10/0x10 [cfg80211]\n  ? __kasan_check_read+0x11/0x1f\n  ? psi_group_change+0x8bc/0x944\n  ? __kasan_check_write+0x14/0x22\n  ? mutex_lock+0x8e/0xdc\n  ? __pfx_mutex_lock+0x10/0x10\n  ? __pfx___radix_tree_lookup+0x10/0x10\n  cfg80211_conn_work+0x245/0x34d [cfg80211]\n  ? __pfx_cfg80211_conn_work+0x10/0x10 [cfg80211]\n  ? update_cfs_rq_load_avg+0x3bc/0x3d7\n  ? sched_clock_noinstr+0x9/0x1a\n  ? sched_clock+0x10/0x24\n  ? sched_clock_cpu+0x7e/0x42e\n  ? newidle_balance+0x796/0x937\n  ? __pfx_sched_clock_cpu+0x10/0x10\n  ? __pfx_newidle_balance+0x10/0x10\n  ? __kasan_check_read+0x11/0x1f\n  ? psi_group_change+0x8bc/0x944\n  ? _raw_spin_unlock+0xe/0x24\n  ? raw_spin_rq_unlock+0x47/0x54\n  ? raw_spin_rq_unlock_irq+0x9/0x1f\n  ? finish_task_switch.isra.0+0x347/0x586\n  ? __schedule+0x27bf/0x2892\n  ? mutex_unlock+0x80/0xd0\n  ? do_raw_spin_lock+0x75/0xdb\n  ? __pfx___schedule+0x10/0x10\n  process_scheduled_works+0x58c/0x821\n  worker_thread+0x4c7/0x586\n  ? __kasan_check_read+0x11/0x1f\n  kthread+0x285/0x294\n  ? __pfx_worker_thread+0x10/0x10\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x29/0x6f\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1b/0x30\n  \u003c/TASK\u003e"
        }
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          "url": "https://git.kernel.org/stable/c/ba4bb0402c60e945c4c396c51f0acac3c3e3ea5c"
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      "title": "wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: Fix memory accounting leak.\n\nMatt Dowling reported a weird UDP memory usage issue.\n\nUnder normal operation, the UDP memory usage reported in /proc/net/sockstat\nremains close to zero.  However, it occasionally spiked to 524,288 pages\nand never dropped.  Moreover, the value doubled when the application was\nterminated.  Finally, it caused intermittent packet drops.\n\nWe can reproduce the issue with the script below [0]:\n\n  1. /proc/net/sockstat reports 0 pages\n\n    # cat /proc/net/sockstat | grep UDP:\n    UDP: inuse 1 mem 0\n\n  2. Run the script till the report reaches 524,288\n\n    # python3 test.py \u0026 sleep 5\n    # cat /proc/net/sockstat | grep UDP:\n    UDP: inuse 3 mem 524288  \u003c-- (INT_MAX + 1) \u003e\u003e PAGE_SHIFT\n\n  3. Kill the socket and confirm the number never drops\n\n    # pkill python3 \u0026\u0026 sleep 5\n    # cat /proc/net/sockstat | grep UDP:\n    UDP: inuse 1 mem 524288\n\n  4. (necessary since v6.0) Trigger proto_memory_pcpu_drain()\n\n    # python3 test.py \u0026 sleep 1 \u0026\u0026 pkill python3\n\n  5. The number doubles\n\n    # cat /proc/net/sockstat | grep UDP:\n    UDP: inuse 1 mem 1048577\n\nThe application set INT_MAX to SO_RCVBUF, which triggered an integer\noverflow in udp_rmem_release().\n\nWhen a socket is close()d, udp_destruct_common() purges its receive\nqueue and sums up skb-\u003etruesize in the queue.  This total is calculated\nand stored in a local unsigned integer variable.\n\nThe total size is then passed to udp_rmem_release() to adjust memory\naccounting.  However, because the function takes a signed integer\nargument, the total size can wrap around, causing an overflow.\n\nThen, the released amount is calculated as follows:\n\n  1) Add size to sk-\u003esk_forward_alloc.\n  2) Round down sk-\u003esk_forward_alloc to the nearest lower multiple of\n      PAGE_SIZE and assign it to amount.\n  3) Subtract amount from sk-\u003esk_forward_alloc.\n  4) Pass amount \u003e\u003e PAGE_SHIFT to __sk_mem_reduce_allocated().\n\nWhen the issue occurred, the total in udp_destruct_common() was 2147484480\n(INT_MAX + 833), which was cast to -2147482816 in udp_rmem_release().\n\nAt 1) sk-\u003esk_forward_alloc is changed from 3264 to -2147479552, and\n2) sets -2147479552 to amount.  3) reverts the wraparound, so we don\u0027t\nsee a warning in inet_sock_destruct().  However, udp_memory_allocated\nends up doubling at 4).\n\nSince commit 3cd3399dd7a8 (\"net: implement per-cpu reserves for\nmemory_allocated\"), memory usage no longer doubles immediately after\na socket is close()d because __sk_mem_reduce_allocated() caches the\namount in udp_memory_per_cpu_fw_alloc.  However, the next time a UDP\nsocket receives a packet, the subtraction takes effect, causing UDP\nmemory usage to double.\n\nThis issue makes further memory allocation fail once the socket\u0027s\nsk-\u003esk_rmem_alloc exceeds net.ipv4.udp_rmem_min, resulting in packet\ndrops.\n\nTo prevent this issue, let\u0027s use unsigned int for the calculation and\ncall sk_forward_alloc_add() only once for the small delta.\n\nNote that first_packet_length() also potentially has the same problem.\n\n[0]:\nfrom socket import *\n\nSO_RCVBUFFORCE = 33\nINT_MAX = (2 ** 31) - 1\n\ns = socket(AF_INET, SOCK_DGRAM)\ns.bind((\u0027\u0027, 0))\ns.setsockopt(SOL_SOCKET, SO_RCVBUFFORCE, INT_MAX)\n\nc = socket(AF_INET, SOCK_DGRAM)\nc.connect(s.getsockname())\n\ndata = b\u0027a\u0027 * 100\n\nwhile True:\n    c.send(data)"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix geneve_opt length integer overflow\n\nstruct geneve_opt uses 5 bit length for each single option, which\nmeans every vary size option should be smaller than 128 bytes.\n\nHowever, all current related Netlink policies cannot promise this\nlength condition and the attacker can exploit a exact 128-byte size\noption to *fake* a zero length option and confuse the parsing logic,\nfurther achieve heap out-of-bounds read.\n\nOne example crash log is like below:\n\n[    3.905425] ==================================================================\n[    3.905925] BUG: KASAN: slab-out-of-bounds in nla_put+0xa9/0xe0\n[    3.906255] Read of size 124 at addr ffff888005f291cc by task poc/177\n[    3.906646]\n[    3.906775] CPU: 0 PID: 177 Comm: poc-oob-read Not tainted 6.1.132 #1\n[    3.907131] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n[    3.907784] Call Trace:\n[    3.907925]  \u003cTASK\u003e\n[    3.908048]  dump_stack_lvl+0x44/0x5c\n[    3.908258]  print_report+0x184/0x4be\n[    3.909151]  kasan_report+0xc5/0x100\n[    3.909539]  kasan_check_range+0xf3/0x1a0\n[    3.909794]  memcpy+0x1f/0x60\n[    3.909968]  nla_put+0xa9/0xe0\n[    3.910147]  tunnel_key_dump+0x945/0xba0\n[    3.911536]  tcf_action_dump_1+0x1c1/0x340\n[    3.912436]  tcf_action_dump+0x101/0x180\n[    3.912689]  tcf_exts_dump+0x164/0x1e0\n[    3.912905]  fw_dump+0x18b/0x2d0\n[    3.913483]  tcf_fill_node+0x2ee/0x460\n[    3.914778]  tfilter_notify+0xf4/0x180\n[    3.915208]  tc_new_tfilter+0xd51/0x10d0\n[    3.918615]  rtnetlink_rcv_msg+0x4a2/0x560\n[    3.919118]  netlink_rcv_skb+0xcd/0x200\n[    3.919787]  netlink_unicast+0x395/0x530\n[    3.921032]  netlink_sendmsg+0x3d0/0x6d0\n[    3.921987]  __sock_sendmsg+0x99/0xa0\n[    3.922220]  __sys_sendto+0x1b7/0x240\n[    3.922682]  __x64_sys_sendto+0x72/0x90\n[    3.922906]  do_syscall_64+0x5e/0x90\n[    3.923814]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n[    3.924122] RIP: 0033:0x7e83eab84407\n[    3.924331] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 \u003c5b\u003e c3 0f 1f 80 00 00 00 00 83 e2 39 83 faf\n[    3.925330] RSP: 002b:00007ffff505e370 EFLAGS: 00000202 ORIG_RAX: 000000000000002c\n[    3.925752] RAX: ffffffffffffffda RBX: 00007e83eaafa740 RCX: 00007e83eab84407\n[    3.926173] RDX: 00000000000001a8 RSI: 00007ffff505e3c0 RDI: 0000000000000003\n[    3.926587] RBP: 00007ffff505f460 R08: 00007e83eace1000 R09: 000000000000000c\n[    3.926977] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffff505f3c0\n[    3.927367] R13: 00007ffff505f5c8 R14: 00007e83ead1b000 R15: 00005d4fbbe6dcb8\n\nFix these issues by enforing correct length condition in related\npolicies."
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        },
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      "title": "net: fix geneve_opt length integer overflow",
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    "datePublished": "2025-04-16T14:12:12.595Z",
    "dateReserved": "2024-12-29T08:45:45.811Z",
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              "version": "3.1"
            }
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              "content": {
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                  },
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                  },
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        },
        "title": "CISA ADP Vulnrichment"
      }
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nproc: fix UAF in proc_get_inode()\n\nFix race between rmmod and /proc/XXX\u0027s inode instantiation.\n\nThe bug is that pde-\u003eproc_ops don\u0027t belong to /proc, it belongs to a\nmodule, therefore dereferencing it after /proc entry has been registered\nis a bug unless use_pde/unuse_pde() pair has been used.\n\nuse_pde/unuse_pde can be avoided (2 atomic ops!) because pde-\u003eproc_ops\nnever changes so information necessary for inode instantiation can be\nsaved _before_ proc_register() in PDE itself and used later, avoiding\npde-\u003eproc_ops-\u003e...  dereference.\n\n      rmmod                         lookup\nsys_delete_module\n                         proc_lookup_de\n\t\t\t   pde_get(de);\n\t\t\t   proc_get_inode(dir-\u003ei_sb, de);\n  mod-\u003eexit()\n    proc_remove\n      remove_proc_subtree\n       proc_entry_rundown(de);\n  free_module(mod);\n\n                               if (S_ISREG(inode-\u003ei_mode))\n\t                         if (de-\u003eproc_ops-\u003eproc_read_iter)\n                           --\u003e As module is already freed, will trigger UAF\n\nBUG: unable to handle page fault for address: fffffbfff80a702b\nPGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nRIP: 0010:proc_get_inode+0x302/0x6e0\nRSP: 0018:ffff88811c837998 EFLAGS: 00010a06\nRAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007\nRDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158\nRBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20\nR10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0\nR13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001\nFS:  00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n proc_lookup_de+0x11f/0x2e0\n __lookup_slow+0x188/0x350\n walk_component+0x2ab/0x4f0\n path_lookupat+0x120/0x660\n filename_lookup+0x1ce/0x560\n vfs_statx+0xac/0x150\n __do_sys_newstat+0x96/0x110\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n[adobriyan@gmail.com: don\u0027t do 2 atomic ops on the common path]"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix insufficient bounds propagation from adjust_scalar_min_max_vals\n\nKuee reported a corner case where the tnum becomes constant after the call\nto __reg_bound_offset(), but the register\u0027s bounds are not, that is, its\nmin bounds are still not equal to the register\u0027s max bounds.\n\nThis in turn allows to leak pointers through turning a pointer register as\nis into an unknown scalar via adjust_ptr_min_max_vals().\n\nBefore:\n\n  func#0 @0\n  0: R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R10=fp(off=0,imm=0,umax=0,var_off=(0x0; 0x0))\n  0: (b7) r0 = 1                        ; R0_w=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0))\n  1: (b7) r3 = 0                        ; R3_w=scalar(imm=0,umax=0,var_off=(0x0; 0x0))\n  2: (87) r3 = -r3                      ; R3_w=scalar()\n  3: (87) r3 = -r3                      ; R3_w=scalar()\n  4: (47) r3 |= 32767                   ; R3_w=scalar(smin=-9223372036854743041,umin=32767,var_off=(0x7fff; 0xffffffffffff8000),s32_min=-2147450881)\n  5: (75) if r3 s\u003e= 0x0 goto pc+1       ; R3_w=scalar(umin=9223372036854808575,var_off=(0x8000000000007fff; 0x7fffffffffff8000),s32_min=-2147450881,u32_min=32767)\n  6: (95) exit\n\n  from 5 to 7: R0=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0)) R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R3=scalar(umin=32767,umax=9223372036854775807,var_off=(0x7fff; 0x7fffffffffff8000),s32_min=-2147450881) R10=fp(off=0,imm=0,umax=0,var_off=(0x0; 0x0))\n  7: (d5) if r3 s\u003c= 0x8000 goto pc+1    ; R3=scalar(umin=32769,umax=9223372036854775807,var_off=(0x7fff; 0x7fffffffffff8000),s32_min=-2147450881,u32_min=32767)\n  8: (95) exit\n\n  from 7 to 9: R0=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0)) R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R3=scalar(umin=32767,umax=32768,var_off=(0x7fff; 0x8000)) R10=fp(off=0,imm=0,umax=0,var_off=(0x0; 0x0))\n  9: (07) r3 += -32767                  ; R3_w=scalar(imm=0,umax=1,var_off=(0x0; 0x0))  \u003c--- [*]\n  10: (95) exit\n\nWhat can be seen here is that R3=scalar(umin=32767,umax=32768,var_off=(0x7fff;\n0x8000)) after the operation R3 += -32767 results in a \u0027malformed\u0027 constant, that\nis, R3_w=scalar(imm=0,umax=1,var_off=(0x0; 0x0)). Intersecting with var_off has\nnot been done at that point via __update_reg_bounds(), which would have improved\nthe umax to be equal to umin.\n\nRefactor the tnum \u003c\u003e min/max bounds information flow into a reg_bounds_sync()\nhelper and use it consistently everywhere. After the fix, bounds have been\ncorrected to R3_w=scalar(imm=0,umax=0,var_off=(0x0; 0x0)) and thus the register\nis regarded as a \u0027proper\u0027 constant scalar of 0.\n\nAfter:\n\n  func#0 @0\n  0: R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R10=fp(off=0,imm=0,umax=0,var_off=(0x0; 0x0))\n  0: (b7) r0 = 1                        ; R0_w=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0))\n  1: (b7) r3 = 0                        ; R3_w=scalar(imm=0,umax=0,var_off=(0x0; 0x0))\n  2: (87) r3 = -r3                      ; R3_w=scalar()\n  3: (87) r3 = -r3                      ; R3_w=scalar()\n  4: (47) r3 |= 32767                   ; R3_w=scalar(smin=-9223372036854743041,umin=32767,var_off=(0x7fff; 0xffffffffffff8000),s32_min=-2147450881)\n  5: (75) if r3 s\u003e= 0x0 goto pc+1       ; R3_w=scalar(umin=9223372036854808575,var_off=(0x8000000000007fff; 0x7fffffffffff8000),s32_min=-2147450881,u32_min=32767)\n  6: (95) exit\n\n  from 5 to 7: R0=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0)) R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R3=scalar(umin=32767,umax=9223372036854775807,var_off=(0x7fff; 0x7fffffffffff8000),s32_min=-2147450881) R10=fp(off=0,imm=0,umax=0,var_off=(0x0; 0x0))\n  7: (d5) if r3 s\u003c= 0x8000 goto pc+1    ; R3=scalar(umin=32769,umax=9223372036854775807,var_off=(0x7fff; 0x7fffffffffff8000),s32_min=-2147450881,u32_min=32767)\n  8: (95) exit\n\n  from 7 to 9: R0=scalar(imm=1,umin=1,umax=1,var_off=(0x1; 0x0)) R1=ctx(off=0,imm=0,umax=0,var_off=(0x0; 0x0)) R3=scalar(umin=32767,umax=32768,var_off=(0x7fff; 0x8000)) R10=fp(off=0\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: consolidate suboption status\n\nMPTCP maintains the received sub-options status is the bitmask carrying\nthe received suboptions and in several bitfields carrying per suboption\nadditional info.\n\nZeroing the bitmask before parsing is not enough to ensure a consistent\nstatus, and the MPTCP code has to additionally clear some bitfiled\ndepending on the actually parsed suboption.\n\nThe above schema is fragile, and syzbot managed to trigger a path where\na relevant bitfield is not cleared/initialized:\n\n  BUG: KMSAN: uninit-value in __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n  BUG: KMSAN: uninit-value in mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n  BUG: KMSAN: uninit-value in ack_update_msk net/mptcp/options.c:1060 [inline]\n  BUG: KMSAN: uninit-value in mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n   __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n   mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n   ack_update_msk net/mptcp/options.c:1060 [inline]\n   mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n   tcp_data_queue+0xb4/0x7be0 net/ipv4/tcp_input.c:5233\n   tcp_rcv_established+0x1061/0x2510 net/ipv4/tcp_input.c:6264\n   tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1916\n   tcp_v4_rcv+0x51df/0x5750 net/ipv4/tcp_ipv4.c:2351\n   ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233\n   NF_HOOK include/linux/netfilter.h:314 [inline]\n   ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254\n   dst_input include/net/dst.h:460 [inline]\n   ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447\n   NF_HOOK include/linux/netfilter.h:314 [inline]\n   ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567\n   __netif_receive_skb_one_core net/core/dev.c:5704 [inline]\n   __netif_receive_skb+0x319/0xa00 net/core/dev.c:5817\n   process_backlog+0x4ad/0xa50 net/core/dev.c:6149\n   __napi_poll+0xe7/0x980 net/core/dev.c:6902\n   napi_poll net/core/dev.c:6971 [inline]\n   net_rx_action+0xa5a/0x19b0 net/core/dev.c:7093\n   handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n   __do_softirq+0x14/0x1a kernel/softirq.c:595\n   do_softirq+0x9a/0x100 kernel/softirq.c:462\n   __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\n   local_bh_enable include/linux/bottom_half.h:33 [inline]\n   rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n   __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4493\n   dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n   neigh_hh_output include/net/neighbour.h:523 [inline]\n   neigh_output include/net/neighbour.h:537 [inline]\n   ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236\n   __ip_finish_output+0x287/0x810\n   ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324\n   NF_HOOK_COND include/linux/netfilter.h:303 [inline]\n   ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434\n   dst_output include/net/dst.h:450 [inline]\n   ip_local_out net/ipv4/ip_output.c:130 [inline]\n   __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536\n   ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550\n   __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1468\n   tcp_transmit_skb net/ipv4/tcp_output.c:1486 [inline]\n   tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2829\n   __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3012\n   tcp_send_fin+0x9f6/0xf50 net/ipv4/tcp_output.c:3618\n   __tcp_close+0x140c/0x1550 net/ipv4/tcp.c:3130\n   __mptcp_close_ssk+0x74e/0x16f0 net/mptcp/protocol.c:2496\n   mptcp_close_ssk+0x26b/0x2c0 net/mptcp/protocol.c:2550\n   mptcp_pm_nl_rm_addr_or_subflow+0x635/0xd10 net/mptcp/pm_netlink.c:889\n   mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:924 [inline]\n   mptcp_pm_flush_addrs_and_subflows net/mptcp/pm_netlink.c:1688 [inline]\n   mptcp_nl_flush_addrs_list net/mptcp/pm_netlink.c:1709 [inline]\n   mptcp_pm_nl_flush_addrs_doit+0xe10/0x1630 net/mptcp/pm_netlink.c:1750\n   genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]\n \n---truncated---"
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