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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\n\nsyzbot found __ip6_tnl_rcv() could access unitiliazed data [1].\n\nCall pskb_inet_may_pull() to fix this, and initialize ipv6h\nvariable after this call as it can change skb-\u003ehead.\n\n[1]\n BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\n  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n  IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\n  ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727\n  __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845\n  ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888\n gre_rcv+0x143f/0x1870\n  ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\n  dst_input include/net/dst.h:461 [inline]\n  ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\n  __netif_receive_skb_one_core net/core/dev.c:5532 [inline]\n  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646\n  netif_receive_skb_internal net/core/dev.c:5732 [inline]\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5791\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\n  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2084 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0x786/0x1200 fs/read_write.c:590\n  ksys_write+0x20f/0x4c0 fs/read_write.c:643\n  __do_sys_write fs/read_write.c:655 [inline]\n  __se_sys_write fs/read_write.c:652 [inline]\n  __x64_sys_write+0x93/0xd0 fs/read_write.c:652\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n  slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\n  slab_alloc_node mm/slub.c:3478 [inline]\n  kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\n  __alloc_skb+0x318/0x740 net/core/skbuff.c:651\n  alloc_skb include/linux/skbuff.h:1286 [inline]\n  alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\n  sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787\n  tun_alloc_skb drivers/net/tun.c:1531 [inline]\n  tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2084 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0x786/0x1200 fs/read_write.c:590\n  ksys_write+0x20f/0x4c0 fs/read_write.c:643\n  __do_sys_write fs/read_write.c:655 [inline]\n  __se_sys_write fs/read_write.c:652 [inline]\n  __x64_sys_write+0x93/0xd0 fs/read_write.c:652\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nCPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023"
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              "value": "AV:N - The vulnerable code is in the IPv6 tunnel receive path, reached directly from `ipv6_rcv()` \u2192 `ip6_protocol_deliver_rcu()` \u2192 `gre_rcv()`/`ip6ip6_rcv()`/`ip4ip6_rcv()` when a host has an ip6tnl, ip6gre, ERSPAN or collect_md tunnel endpoint configured. A remote attacker triggers it purely by sending a crafted IPv6 packet (proto 47/41/4/137) with a truncated inner header.\nAC:L - The attacker fully controls the packet: simply emitting an outer IPv6+GRE header with zero/short inner payload deterministically reaches `dscp_ecn_decapsulate()` with the inner header absent from the linear area. No race, no memory-layout grooming, and no condition outside the attacker\u0027s control is required.\nPR:N - Tunnel decapsulation is completely unauthenticated \u2014 `ip6_tnl_rcv_ctl()`/`ip6_tnl_lookup()` only compare addresses and keys, and wildcard, `collect_md` and fallback tunnels match arbitrary sources. The attacker needs no account or credentials on the target.\nUI:N - Processing happens automatically in softirq context when the packet is received; no local user has to open, mount, or click anything.\nS:U - The uninitialized read and the out-of-bounds DSCP write are confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - KMSAN confirms uninitialized kernel heap memory is read and consumed by `__INET_ECN_decapsulate()`, and the outcome is remotely observable (packet dropped vs. delivered, plus the ratelimited \"non-ECT from %pI6 with DS=%#x\" log), giving a repeatable oracle over stale heap contents. The exposure is strictly bounded to a couple of bytes within the skb\u0027s own buffer rather than an arbitrary read.\nI:L - On tunnels configured with `IP6_TNL_F_RCV_DSCP_COPY`, `ipv6_change_dsfield()`/`ipv4_change_dsfield()` perform an unchecked read-modify-write beyond the packet data (unlike the bounds-checked `INET_ECN_set_ce()`), modifying kernel memory that does not belong to the packet \u2014 in the zero-tailroom case the first bytes of `struct skb_shared_info`. The corruption is a few bytes at a fixed offset, not an arbitrary write.\nA:H - The unchecked DSCP write can land on `skb_shared_info`\u0027s `meta_len` and `frag_list` pointer bytes, corrupting a kernel pointer that is later dereferenced during skb traversal/free, yielding an oops; garbage-driven ECN decisions additionally cause spurious `rx_frame_errors` drops of tunnel traffic, and the condition is a hard KMSAN/instrumented-kernel abort. Any unauthenticated remote peer can repeat it indefinitely."
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    "cveId": "CVE-2024-26641",
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    "dateReserved": "2024-02-19T14:20:24.137Z",
    "dateUpdated": "2026-08-05T11:26:29.008Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don\u0027t abort filesystem when attempting to snapshot deleted subvolume\n\nIf the source file descriptor to the snapshot ioctl refers to a deleted\nsubvolume, we get the following abort:\n\n  BTRFS: Transaction aborted (error -2)\n  WARNING: CPU: 0 PID: 833 at fs/btrfs/transaction.c:1875 create_pending_snapshot+0x1040/0x1190 [btrfs]\n  Modules linked in: pata_acpi btrfs ata_piix libata scsi_mod virtio_net blake2b_generic xor net_failover virtio_rng failover scsi_common rng_core raid6_pq libcrc32c\n  CPU: 0 PID: 833 Comm: t_snapshot_dele Not tainted 6.7.0-rc6 #2\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-1.fc39 04/01/2014\n  RIP: 0010:create_pending_snapshot+0x1040/0x1190 [btrfs]\n  RSP: 0018:ffffa09c01337af8 EFLAGS: 00010282\n  RAX: 0000000000000000 RBX: ffff9982053e7c78 RCX: 0000000000000027\n  RDX: ffff99827dc20848 RSI: 0000000000000001 RDI: ffff99827dc20840\n  RBP: ffffa09c01337c00 R08: 0000000000000000 R09: ffffa09c01337998\n  R10: 0000000000000003 R11: ffffffffb96da248 R12: fffffffffffffffe\n  R13: ffff99820535bb28 R14: ffff99820b7bd000 R15: ffff99820381ea80\n  FS:  00007fe20aadabc0(0000) GS:ffff99827dc00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000559a120b502f CR3: 00000000055b6000 CR4: 00000000000006f0\n  Call Trace:\n   \u003cTASK\u003e\n   ? create_pending_snapshot+0x1040/0x1190 [btrfs]\n   ? __warn+0x81/0x130\n   ? create_pending_snapshot+0x1040/0x1190 [btrfs]\n   ? report_bug+0x171/0x1a0\n   ? handle_bug+0x3a/0x70\n   ? exc_invalid_op+0x17/0x70\n   ? asm_exc_invalid_op+0x1a/0x20\n   ? create_pending_snapshot+0x1040/0x1190 [btrfs]\n   ? create_pending_snapshot+0x1040/0x1190 [btrfs]\n   create_pending_snapshots+0x92/0xc0 [btrfs]\n   btrfs_commit_transaction+0x66b/0xf40 [btrfs]\n   btrfs_mksubvol+0x301/0x4d0 [btrfs]\n   btrfs_mksnapshot+0x80/0xb0 [btrfs]\n   __btrfs_ioctl_snap_create+0x1c2/0x1d0 [btrfs]\n   btrfs_ioctl_snap_create_v2+0xc4/0x150 [btrfs]\n   btrfs_ioctl+0x8a6/0x2650 [btrfs]\n   ? kmem_cache_free+0x22/0x340\n   ? do_sys_openat2+0x97/0xe0\n   __x64_sys_ioctl+0x97/0xd0\n   do_syscall_64+0x46/0xf0\n   entry_SYSCALL_64_after_hwframe+0x6e/0x76\n  RIP: 0033:0x7fe20abe83af\n  RSP: 002b:00007ffe6eff1360 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n  RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fe20abe83af\n  RDX: 00007ffe6eff23c0 RSI: 0000000050009417 RDI: 0000000000000003\n  RBP: 0000000000000003 R08: 0000000000000000 R09: 00007fe20ad16cd0\n  R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n  R13: 00007ffe6eff13c0 R14: 00007fe20ad45000 R15: 0000559a120b6d58\n   \u003c/TASK\u003e\n  ---[ end trace 0000000000000000 ]---\n  BTRFS: error (device vdc: state A) in create_pending_snapshot:1875: errno=-2 No such entry\n  BTRFS info (device vdc: state EA): forced readonly\n  BTRFS warning (device vdc: state EA): Skipping commit of aborted transaction.\n  BTRFS: error (device vdc: state EA) in cleanup_transaction:2055: errno=-2 No such entry\n\nThis happens because create_pending_snapshot() initializes the new root\nitem as a copy of the source root item. This includes the refs field,\nwhich is 0 for a deleted subvolume. The call to btrfs_insert_root()\ntherefore inserts a root with refs == 0. btrfs_get_new_fs_root() then\nfinds the root and returns -ENOENT if refs == 0, which causes\ncreate_pending_snapshot() to abort.\n\nFix it by checking the source root\u0027s refs before attempting the\nsnapshot, but after locking subvol_sem to avoid racing with deletion."
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