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          "product": "Linux",
          "programFiles": [
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            "mm/shmem.c",
            "mm/swap.h"
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          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
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              "status": "affected",
              "version": "6.14"
            },
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              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.15.5",
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            },
            {
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              "versionType": "original_commit_for_fix"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/shmem, swap: fix softlockup with mTHP swapin\n\nFollowing softlockup can be easily reproduced on my test machine with:\n\necho always \u003e /sys/kernel/mm/transparent_hugepage/hugepages-64kB/enabled\nswapon /dev/zram0 # zram0 is a 48G swap device\nmkdir -p /sys/fs/cgroup/memory/test\necho 1G \u003e /sys/fs/cgroup/test/memory.max\necho $BASHPID \u003e /sys/fs/cgroup/test/cgroup.procs\nwhile true; do\n    dd if=/dev/zero of=/tmp/test.img bs=1M count=5120\n    cat /tmp/test.img \u003e /dev/null\n    rm /tmp/test.img\ndone\n\nThen after a while:\nwatchdog: BUG: soft lockup - CPU#0 stuck for 763s! [cat:5787]\nModules linked in: zram virtiofs\nCPU: 0 UID: 0 PID: 5787 Comm: cat Kdump: loaded Tainted: G             L      6.15.0.orig-gf3021d9246bc-dirty #118 PREEMPT(voluntary)\u00b7\nTainted: [L]=SOFTLOCKUP\nHardware name: Red Hat KVM/RHEL-AV, BIOS 0.0.0 02/06/2015\nRIP: 0010:mpol_shared_policy_lookup+0xd/0x70\nCode: e9 b8 b4 ff ff 31 c0 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 0f 1f 44 00 00 41 54 55 53 \u003c48\u003e 8b 1f 48 85 db 74 41 4c 8d 67 08 48 89 fb 48 89 f5 4c 89 e7 e8\nRSP: 0018:ffffc90002b1fc28 EFLAGS: 00000202\nRAX: 00000000001c20ca RBX: 0000000000724e1e RCX: 0000000000000001\nRDX: ffff888118e214c8 RSI: 0000000000057d42 RDI: ffff888118e21518\nRBP: 000000000002bec8 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000bf4 R11: 0000000000000000 R12: 0000000000000001\nR13: 00000000001c20ca R14: 00000000001c20ca R15: 0000000000000000\nFS:  00007f03f995c740(0000) GS:ffff88a07ad9a000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f03f98f1000 CR3: 0000000144626004 CR4: 0000000000770eb0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n shmem_alloc_folio+0x31/0xc0\n shmem_swapin_folio+0x309/0xcf0\n ? filemap_get_entry+0x117/0x1e0\n ? xas_load+0xd/0xb0\n ? filemap_get_entry+0x101/0x1e0\n shmem_get_folio_gfp+0x2ed/0x5b0\n shmem_file_read_iter+0x7f/0x2e0\n vfs_read+0x252/0x330\n ksys_read+0x68/0xf0\n do_syscall_64+0x4c/0x1c0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7f03f9a46991\nCode: 00 48 8b 15 81 14 10 00 f7 d8 64 89 02 b8 ff ff ff ff eb bd e8 20 ad 01 00 f3 0f 1e fa 80 3d 35 97 10 00 00 74 13 31 c0 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 4f c3 66 0f 1f 44 00 00 55 48 89 e5 48 83 ec\nRSP: 002b:00007fff3c52bd28 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\nRAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007f03f9a46991\nRDX: 0000000000040000 RSI: 00007f03f98ba000 RDI: 0000000000000003\nRBP: 00007fff3c52bd50 R08: 0000000000000000 R09: 00007f03f9b9a380\nR10: 0000000000000022 R11: 0000000000000246 R12: 0000000000040000\nR13: 00007f03f98ba000 R14: 0000000000000003 R15: 0000000000000000\n \u003c/TASK\u003e\n\nThe reason is simple, readahead brought some order 0 folio in swap cache,\nand the swapin mTHP folio being allocated is in conflict with it, so\nswapcache_prepare fails and causes shmem_swap_alloc_folio to return\n-EEXIST, and shmem simply retries again and again causing this loop.\n\nFix it by applying a similar fix for anon mTHP swapin.\n\nThe performance change is very slight, time of swapin 10g zero folios\nwith shmem (test for 12 times):\nBefore:  2.47s\nAfter:   2.48s\n\n[kasong@tencent.com: add comment]"
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        {
          "url": "https://git.kernel.org/stable/c/a05dd8ae5cbb1cb45f349922cfea4f548a5e5d6f"
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      "title": "mm/shmem, swap: fix softlockup with mTHP swapin",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38241",
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    "dateReserved": "2025-04-16T04:51:23.996Z",
    "dateUpdated": "2026-05-11T21:23:58.127Z",
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: userfaultfd: fix race of userfaultfd_move and swap cache\n\nThis commit fixes two kinds of races, they may have different results:\n\nBarry reported a BUG_ON in commit c50f8e6053b0, we may see the same\nBUG_ON if the filemap lookup returned NULL and folio is added to swap\ncache after that.\n\nIf another kind of race is triggered (folio changed after lookup) we\nmay see RSS counter is corrupted:\n\n[  406.893936] BUG: Bad rss-counter state mm:ffff0000c5a9ddc0\ntype:MM_ANONPAGES val:-1\n[  406.894071] BUG: Bad rss-counter state mm:ffff0000c5a9ddc0\ntype:MM_SHMEMPAGES val:1\n\nBecause the folio is being accounted to the wrong VMA.\n\nI\u0027m not sure if there will be any data corruption though, seems no. \nThe issues above are critical already.\n\n\nOn seeing a swap entry PTE, userfaultfd_move does a lockless swap cache\nlookup, and tries to move the found folio to the faulting vma.  Currently,\nit relies on checking the PTE value to ensure that the moved folio still\nbelongs to the src swap entry and that no new folio has been added to the\nswap cache, which turns out to be unreliable.\n\nWhile working and reviewing the swap table series with Barry, following\nexisting races are observed and reproduced [1]:\n\nIn the example below, move_pages_pte is moving src_pte to dst_pte, where\nsrc_pte is a swap entry PTE holding swap entry S1, and S1 is not in the\nswap cache:\n\nCPU1                               CPU2\nuserfaultfd_move\n  move_pages_pte()\n    entry = pte_to_swp_entry(orig_src_pte);\n    // Here it got entry = S1\n    ... \u003c interrupted\u003e ...\n                                   \u003cswapin src_pte, alloc and use folio A\u003e\n                                   // folio A is a new allocated folio\n                                   // and get installed into src_pte\n                                   \u003cfrees swap entry S1\u003e\n                                   // src_pte now points to folio A, S1\n                                   // has swap count == 0, it can be freed\n                                   // by folio_swap_swap or swap\n                                   // allocator\u0027s reclaim.\n                                   \u003ctry to swap out another folio B\u003e\n                                   // folio B is a folio in another VMA.\n                                   \u003cput folio B to swap cache using S1 \u003e\n                                   // S1 is freed, folio B can use it\n                                   // for swap out with no problem.\n                                   ...\n    folio = filemap_get_folio(S1)\n    // Got folio B here !!!\n    ... \u003c interrupted again\u003e ...\n                                   \u003cswapin folio B and free S1\u003e\n                                   // Now S1 is free to be used again.\n                                   \u003cswapout src_pte \u0026 folio A using S1\u003e\n                                   // Now src_pte is a swap entry PTE\n                                   // holding S1 again.\n    folio_trylock(folio)\n    move_swap_pte\n      double_pt_lock\n      is_pte_pages_stable\n      // Check passed because src_pte == S1\n      folio_move_anon_rmap(...)\n      // Moved invalid folio B here !!!\n\nThe race window is very short and requires multiple collisions of multiple\nrare events, so it\u0027s very unlikely to happen, but with a deliberately\nconstructed reproducer and increased time window, it can be reproduced\neasily.\n\nThis can be fixed by checking if the folio returned by filemap is the\nvalid swap cache folio after acquiring the folio lock.\n\nAnother similar race is possible: filemap_get_folio may return NULL, but\nfolio (A) could be swapped in and then swapped out again using the same\nswap entry after the lookup.  In such a case, folio (A) may remain in the\nswap cache, so it must be moved too:\n\nCPU1                               CPU2\nuserfaultfd_move\n  move_pages_pte()\n    entry = pte_to_swp_entry(orig_src_pte);\n    // Here it got entry = S1, and S1 is not in swap cache\n    folio = filemap_get\n---truncated---"
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      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/db2ca8074955ca64187a4fb596dd290b9c446cd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ea148a799198518d8ebab63ddd0bb6114a103bc"
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      ],
      "title": "mm: userfaultfd: fix race of userfaultfd_move and swap cache",
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38242",
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    "dateReserved": "2025-04-16T04:51:23.996Z",
    "dateUpdated": "2026-05-11T21:23:59.291Z",
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          "vendor": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential deadlock when reconnecting channels\n\nFix cifs_signal_cifsd_for_reconnect() to take the correct lock order\nand prevent the following deadlock from happening\n\n======================================================\nWARNING: possible circular locking dependency detected\n6.16.0-rc3-build2+ #1301 Tainted: G S      W\n------------------------------------------------------\ncifsd/6055 is trying to acquire lock:\nffff88810ad56038 (\u0026tcp_ses-\u003esrv_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x134/0x200\n\nbut task is already holding lock:\nffff888119c64330 (\u0026ret_buf-\u003echan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #2 (\u0026ret_buf-\u003echan_lock){+.+.}-{3:3}:\n       validate_chain+0x1cf/0x270\n       __lock_acquire+0x60e/0x780\n       lock_acquire.part.0+0xb4/0x1f0\n       _raw_spin_lock+0x2f/0x40\n       cifs_setup_session+0x81/0x4b0\n       cifs_get_smb_ses+0x771/0x900\n       cifs_mount_get_session+0x7e/0x170\n       cifs_mount+0x92/0x2d0\n       cifs_smb3_do_mount+0x161/0x460\n       smb3_get_tree+0x55/0x90\n       vfs_get_tree+0x46/0x180\n       do_new_mount+0x1b0/0x2e0\n       path_mount+0x6ee/0x740\n       do_mount+0x98/0xe0\n       __do_sys_mount+0x148/0x180\n       do_syscall_64+0xa4/0x260\n       entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n-\u003e #1 (\u0026ret_buf-\u003eses_lock){+.+.}-{3:3}:\n       validate_chain+0x1cf/0x270\n       __lock_acquire+0x60e/0x780\n       lock_acquire.part.0+0xb4/0x1f0\n       _raw_spin_lock+0x2f/0x40\n       cifs_match_super+0x101/0x320\n       sget+0xab/0x270\n       cifs_smb3_do_mount+0x1e0/0x460\n       smb3_get_tree+0x55/0x90\n       vfs_get_tree+0x46/0x180\n       do_new_mount+0x1b0/0x2e0\n       path_mount+0x6ee/0x740\n       do_mount+0x98/0xe0\n       __do_sys_mount+0x148/0x180\n       do_syscall_64+0xa4/0x260\n       entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n-\u003e #0 (\u0026tcp_ses-\u003esrv_lock){+.+.}-{3:3}:\n       check_noncircular+0x95/0xc0\n       check_prev_add+0x115/0x2f0\n       validate_chain+0x1cf/0x270\n       __lock_acquire+0x60e/0x780\n       lock_acquire.part.0+0xb4/0x1f0\n       _raw_spin_lock+0x2f/0x40\n       cifs_signal_cifsd_for_reconnect+0x134/0x200\n       __cifs_reconnect+0x8f/0x500\n       cifs_handle_standard+0x112/0x280\n       cifs_demultiplex_thread+0x64d/0xbc0\n       kthread+0x2f7/0x310\n       ret_from_fork+0x2a/0x230\n       ret_from_fork_asm+0x1a/0x30\n\nother info that might help us debug this:\n\nChain exists of:\n  \u0026tcp_ses-\u003esrv_lock --\u003e \u0026ret_buf-\u003eses_lock --\u003e \u0026ret_buf-\u003echan_lock\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(\u0026ret_buf-\u003echan_lock);\n                               lock(\u0026ret_buf-\u003eses_lock);\n                               lock(\u0026ret_buf-\u003echan_lock);\n  lock(\u0026tcp_ses-\u003esrv_lock);\n\n *** DEADLOCK ***\n\n3 locks held by cifsd/6055:\n #0: ffffffff857de398 (\u0026cifs_tcp_ses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x7b/0x200\n #1: ffff888119c64060 (\u0026ret_buf-\u003eses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x9c/0x200\n #2: ffff888119c64330 (\u0026ret_buf-\u003echan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200"
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      "title": "smb: client: fix potential deadlock when reconnecting channels",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().\n\nsyzbot reported a warning below during atm_dev_register(). [0]\n\nBefore creating a new device and procfs/sysfs for it, atm_dev_register()\nlooks up a duplicated device by __atm_dev_lookup().  These operations are\ndone under atm_dev_mutex.\n\nHowever, when removing a device in atm_dev_deregister(), it releases the\nmutex just after removing the device from the list that __atm_dev_lookup()\niterates over.\n\nSo, there will be a small race window where the device does not exist on\nthe device list but procfs/sysfs are still not removed, triggering the\nsplat.\n\nLet\u0027s hold the mutex until procfs/sysfs are removed in\natm_dev_deregister().\n\n[0]:\nproc_dir_entry \u0027atm/atmtcp:0\u0027 already registered\nWARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377\nModules linked in:\nCPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nRIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377\nCode: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 \u003c0f\u003e 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48\nRSP: 0018:ffffc9000466fa30 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248\nRDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001\nRBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140\nR13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444\nFS:  00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n proc_create_data+0xbe/0x110 fs/proc/generic.c:585\n atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361\n atm_dev_register+0x46d/0x890 net/atm/resources.c:113\n atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369\n atmtcp_attach drivers/atm/atmtcp.c:403 [inline]\n atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x115/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f38b3b74459\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459\nRDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005\nRBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f\nR10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac\nR13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b\n \u003c/TASK\u003e"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt: properly flush XDP redirect lists\n\nWe encountered following crash when testing a XDP_REDIRECT feature\nin production:\n\n[56251.579676] list_add corruption. next-\u003eprev should be prev (ffff93120dd40f30), but was ffffb301ef3a6740. (next=ffff93120dd\n40f30).\n[56251.601413] ------------[ cut here ]------------\n[56251.611357] kernel BUG at lib/list_debug.c:29!\n[56251.621082] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n[56251.632073] CPU: 111 UID: 0 PID: 0 Comm: swapper/111 Kdump: loaded Tainted: P           O       6.12.33-cloudflare-2025.6.\n3 #1\n[56251.653155] Tainted: [P]=PROPRIETARY_MODULE, [O]=OOT_MODULE\n[56251.663877] Hardware name: MiTAC GC68B-B8032-G11P6-GPU/S8032GM-HE-CFR, BIOS V7.020.B10-sig 01/22/2025\n[56251.682626] RIP: 0010:__list_add_valid_or_report+0x4b/0xa0\n[56251.693203] Code: 0e 48 c7 c7 68 e7 d9 97 e8 42 16 fe ff 0f 0b 48 8b 52 08 48 39 c2 74 14 48 89 f1 48 c7 c7 90 e7 d9 97 48\n 89 c6 e8 25 16 fe ff \u003c0f\u003e 0b 4c 8b 02 49 39 f0 74 14 48 89 d1 48 c7 c7 e8 e7 d9 97 4c 89\n[56251.725811] RSP: 0018:ffff93120dd40b80 EFLAGS: 00010246\n[56251.736094] RAX: 0000000000000075 RBX: ffffb301e6bba9d8 RCX: 0000000000000000\n[56251.748260] RDX: 0000000000000000 RSI: ffff9149afda0b80 RDI: ffff9149afda0b80\n[56251.760349] RBP: ffff9131e49c8000 R08: 0000000000000000 R09: ffff93120dd40a18\n[56251.772382] R10: ffff9159cf2ce1a8 R11: 0000000000000003 R12: ffff911a80850000\n[56251.784364] R13: ffff93120fbc7000 R14: 0000000000000010 R15: ffff9139e7510e40\n[56251.796278] FS:  0000000000000000(0000) GS:ffff9149afd80000(0000) knlGS:0000000000000000\n[56251.809133] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[56251.819561] CR2: 00007f5e85e6f300 CR3: 00000038b85e2006 CR4: 0000000000770ef0\n[56251.831365] PKRU: 55555554\n[56251.838653] Call Trace:\n[56251.845560]  \u003cIRQ\u003e\n[56251.851943]  cpu_map_enqueue.cold+0x5/0xa\n[56251.860243]  xdp_do_redirect+0x2d9/0x480\n[56251.868388]  bnxt_rx_xdp+0x1d8/0x4c0 [bnxt_en]\n[56251.877028]  bnxt_rx_pkt+0x5f7/0x19b0 [bnxt_en]\n[56251.885665]  ? cpu_max_write+0x1e/0x100\n[56251.893510]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.902276]  __bnxt_poll_work+0x190/0x340 [bnxt_en]\n[56251.911058]  bnxt_poll+0xab/0x1b0 [bnxt_en]\n[56251.919041]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.927568]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.935958]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.944250]  __napi_poll+0x2b/0x160\n[56251.951155]  bpf_trampoline_6442548651+0x79/0x123\n[56251.959262]  __napi_poll+0x5/0x160\n[56251.966037]  net_rx_action+0x3d2/0x880\n[56251.973133]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.981265]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.989262]  ? __hrtimer_run_queues+0x162/0x2a0\n[56251.996967]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56252.004875]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56252.012673]  ? bnxt_msix+0x62/0x70 [bnxt_en]\n[56252.019903]  handle_softirqs+0xcf/0x270\n[56252.026650]  irq_exit_rcu+0x67/0x90\n[56252.032933]  common_interrupt+0x85/0xa0\n[56252.039498]  \u003c/IRQ\u003e\n[56252.044246]  \u003cTASK\u003e\n[56252.048935]  asm_common_interrupt+0x26/0x40\n[56252.055727] RIP: 0010:cpuidle_enter_state+0xb8/0x420\n[56252.063305] Code: dc 01 00 00 e8 f9 79 3b ff e8 64 f7 ff ff 49 89 c5 0f 1f 44 00 00 31 ff e8 a5 32 3a ff 45 84 ff 0f 85 ae\n 01 00 00 fb 45 85 f6 \u003c0f\u003e 88 88 01 00 00 48 8b 04 24 49 63 ce 4c 89 ea 48 6b f1 68 48 29\n[56252.088911] RSP: 0018:ffff93120c97fe98 EFLAGS: 00000202\n[56252.096912] RAX: ffff9149afd80000 RBX: ffff9141d3a72800 RCX: 0000000000000000\n[56252.106844] RDX: 00003329176c6b98 RSI: ffffffe36db3fdc7 RDI: 0000000000000000\n[56252.116733] RBP: 0000000000000002 R08: 0000000000000002 R09: 000000000000004e\n[56252.126652] R10: ffff9149afdb30c4 R11: 071c71c71c71c71c R12: ffffffff985ff860\n[56252.136637] R13: 00003329176c6b98 R14: 0000000000000002 R15: 0000000000000000\n[56252.146667]  ? cpuidle_enter_state+0xab/0x420\n[56252.153909]  cpuidle_enter+0x2d/0x40\n[56252.160360]  do_idle+0x176/0x1c0\n[56252.166456\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: mcast: Fix use-after-free during router port configuration\n\nThe bridge maintains a global list of ports behind which a multicast\nrouter resides. The list is consulted during forwarding to ensure\nmulticast packets are forwarded to these ports even if the ports are not\nmember in the matching MDB entry.\n\nWhen per-VLAN multicast snooping is enabled, the per-port multicast\ncontext is disabled on each port and the port is removed from the global\nrouter port list:\n\n # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1\n # ip link add name dummy1 up master br1 type dummy\n # ip link set dev dummy1 type bridge_slave mcast_router 2\n $ bridge -d mdb show | grep router\n router ports on br1: dummy1\n # ip link set dev br1 type bridge mcast_vlan_snooping 1\n $ bridge -d mdb show | grep router\n\nHowever, the port can be re-added to the global list even when per-VLAN\nmulticast snooping is enabled:\n\n # ip link set dev dummy1 type bridge_slave mcast_router 0\n # ip link set dev dummy1 type bridge_slave mcast_router 2\n $ bridge -d mdb show | grep router\n router ports on br1: dummy1\n\nSince commit 4b30ae9adb04 (\"net: bridge: mcast: re-implement\nbr_multicast_{enable, disable}_port functions\"), when per-VLAN multicast\nsnooping is enabled, multicast disablement on a port will disable the\nper-{port, VLAN} multicast contexts and not the per-port one. As a\nresult, a port will remain in the global router port list even after it\nis deleted. This will lead to a use-after-free [1] when the list is\ntraversed (when adding a new port to the list, for example):\n\n # ip link del dev dummy1\n # ip link add name dummy2 up master br1 type dummy\n # ip link set dev dummy2 type bridge_slave mcast_router 2\n\nSimilarly, stale entries can also be found in the per-VLAN router port\nlist. When per-VLAN multicast snooping is disabled, the per-{port, VLAN}\ncontexts are disabled on each port and the port is removed from the\nper-VLAN router port list:\n\n # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1\n # ip link add name dummy1 up master br1 type dummy\n # bridge vlan add vid 2 dev dummy1\n # bridge vlan global set vid 2 dev br1 mcast_snooping 1\n # bridge vlan set vid 2 dev dummy1 mcast_router 2\n $ bridge vlan global show dev br1 vid 2 | grep router\n       router ports: dummy1\n # ip link set dev br1 type bridge mcast_vlan_snooping 0\n $ bridge vlan global show dev br1 vid 2 | grep router\n\nHowever, the port can be re-added to the per-VLAN list even when\nper-VLAN multicast snooping is disabled:\n\n # bridge vlan set vid 2 dev dummy1 mcast_router 0\n # bridge vlan set vid 2 dev dummy1 mcast_router 2\n $ bridge vlan global show dev br1 vid 2 | grep router\n       router ports: dummy1\n\nWhen the VLAN is deleted from the port, the per-{port, VLAN} multicast\ncontext will not be disabled since multicast snooping is not enabled\non the VLAN. As a result, the port will remain in the per-VLAN router\nport list even after it is no longer member in the VLAN. This will lead\nto a use-after-free [2] when the list is traversed (when adding a new\nport to the list, for example):\n\n # ip link add name dummy2 up master br1 type dummy\n # bridge vlan add vid 2 dev dummy2\n # bridge vlan del vid 2 dev dummy1\n # bridge vlan set vid 2 dev dummy2 mcast_router 2\n\nFix these issues by removing the port from the relevant (global or\nper-VLAN) router port list in br_multicast_port_ctx_deinit(). The\nfunction is invoked during port deletion with the per-port multicast\ncontext and during VLAN deletion with the per-{port, VLAN} multicast\ncontext.\n\nNote that deleting the multicast router timer is not enough as it only\ntakes care of the temporary multicast router states (1 or 3) and not the\npermanent one (2).\n\n[1]\nBUG: KASAN: slab-out-of-bounds in br_multicast_add_router.part.0+0x3f1/0x560\nWrite of size 8 at addr ffff888004a67328 by task ip/384\n[...]\nCall Trace:\n \u003cTASK\u003e\n dump_stack\n---truncated---"
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          "programFiles": [
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          "url": "https://git.kernel.org/stable/c/f3054152c12e2eed1e72704aff47b0ea58229584"
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