{"id":"CVE-2022-49142","summary":"net: preserve skb_end_offset() in skb_unclone_keeptruesize()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: preserve skb_end_offset() in skb_unclone_keeptruesize()\n\nsyzbot found another way to trigger the infamous WARN_ON_ONCE(delta \u003c len)\nin skb_try_coalesce() [1]\n\nI was able to root cause the issue to kfence.\n\nWhen kfence is in action, the following assertion is no longer true:\n\nint size = xxxx;\nvoid *ptr1 = kmalloc(size, gfp);\nvoid *ptr2 = kmalloc(size, gfp);\n\nif (ptr1 && ptr2)\n\tASSERT(ksize(ptr1) == ksize(ptr2));\n\nWe attempted to fix these issues in the blamed commits, but forgot\nthat TCP was possibly shifting data after skb_unclone_keeptruesize()\nhas been used, notably from tcp_retrans_try_collapse().\n\nSo we not only need to keep same skb-\u003etruesize value,\nwe also need to make sure TCP wont fill new tailroom\nthat pskb_expand_head() was able to get from a\naddr = kmalloc(...) followed by ksize(addr)\n\nSplit skb_unclone_keeptruesize() into two parts:\n\n1) Inline skb_unclone_keeptruesize() for the common case,\n   when skb is not cloned.\n\n2) Out of line __skb_unclone_keeptruesize() for the 'slow path'.\n\nWARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nModules linked in:\nCPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nCode: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa \u003c0f\u003e 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa\nRSP: 0018:ffffc900063af268 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000\nRDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003\nRBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000\nR10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8\nR13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155\nFS:  00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline]\n tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630\n tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914\n tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025\n tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947\n tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719\n sk_backlog_rcv include/net/sock.h:1037 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2779\n release_sock+0x54/0x1b0 net/core/sock.c:3311\n sk_wait_data+0x177/0x450 net/core/sock.c:2821\n tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457\n tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572\n inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632\n ___sys_recvmsg+0x127/0x200 net/socket.c:2674\n __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae","modified":"2026-08-12T03:51:27.756431725Z","published":"2025-02-26T01:55:12.823Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49142.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/23629b673b780d967b88a850b1518cf0f0ffc6aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a903e516f5df44b46d526b403d93e7be1a425538"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9a6d30264327d8ff7f23da33e7a77ffb793fa3f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49142.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49142"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"097b9146c0e26aabaa6ff3e5ea536a53f5254a79"},{"fixed":"23629b673b780d967b88a850b1518cf0f0ffc6aa"},{"fixed":"a9a6d30264327d8ff7f23da33e7a77ffb793fa3f"},{"fixed":"a903e516f5df44b46d526b403d93e7be1a425538"},{"fixed":"2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"7118945cdf0d4b5a76eb4f5f330ac6f48d372025"},{"last_affected":"ec697f7f3f6a89d4dd1af113587d0330b5a033e8"},{"last_affected":"7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5"},{"last_affected":"5d55a6a46a7f70bc1d270c50200edd3096cb380c"},{"last_affected":"e6af7cb64b7b37b8a371acdbe33a636496ffb5a4"},{"last_affected":"97ff09a7ed484fef2b1bbc103857444b7332fca8"},{"last_affected":"bf5a58d143d7899d2c89e585be6e98ec81fe9683"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.260"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.260"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.224"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.179"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.103"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.21"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.11.4"},{"fixed":"5.12"}]}],"versions":["v5.10","v5.11","v5.11.3","v5.10.20","v5.4.102","v4.19.178","v4.14.223","v4.9.259","v4.4.259","v5.11.2","v5.10.19","v5.4.101","v4.19.177","v4.14.222","v4.9.258","v4.4.258","v5.10.18","v5.4.100","v5.11.1","v5.11-rc3","v5.10.17","v5.4.99","v4.19.176","v4.14.221","v4.9.257","v4.4.257","v5.11-rc7","v5.11-rc6","v5.10.16","v5.4.98","v5.11-rc5","v5.11-rc1","v5.10.15","v5.4.97","v4.19.175","v5.11-rc4","v5.10.14","v5.4.96","v4.19.174","v4.14.220","v4.9.256","v4.4.256","v5.11-rc2","v5.10.13","v5.4.95","v4.19.173","v4.14.219","v4.9.255","v4.4.255","v5.10.12","v5.4.94","v4.19.172","v4.14.218","v4.9.254","v4.4.254","v5.10.11","v5.4.93","v4.19.171","v4.14.217","v4.9.253","v4.4.253","v5.10.10","v5.4.92","v4.19.170","v5.10.9","v5.4.91","v4.19.169","v4.14.216","v4.9.252","v4.4.252","v5.10-rc1","v5.10.8","v5.4.90","v4.19.168","v5.10.7","v5.4.89","v4.19.167","v4.14.215","v4.9.251","v4.4.251","v5.10.6","v5.4.88","v4.19.166","v4.14.214","v4.9.250","v4.4.250","v5.10.5","v5.4.87","v4.19.165","v4.14.213","v4.9.249","v4.4.249","v5.10.4","v5.4.86","v4.19.164","v5.10.3","v5.4.85","v4.19.163","v4.14.212","v4.9.248","v4.4.248","v5.10.2","v5.10.1","v5.4.84","v5.10-rc7","v5.4.83","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v4.14.211","v4.9.247","v4.4.247","v4.19.162","v5.4.82","v5.10-rc2","v5.10-rc5","v5.4.81","v4.19.161","v4.14.210","v5.4.80","v4.19.160","v4.14.209","v4.9.246","v4.4.246","v5.4.79","v4.19.159","v4.14.208","v4.9.245","v4.4.245","v5.4.78","v4.19.158","v4.14.207","v4.9.244","v4.4.244","v5.4.77","v4.19.157","v4.14.206","v4.9.243","v4.4.243","v5.4.76","v4.19.156","v4.14.205","v4.9.242","v4.4.242","v5.4.75","v4.19.155","v4.14.204","v4.9.241","v4.4.241","v5.4.74","v4.19.154","v4.14.203","v5.4.73","v4.19.153","v5.4.72","v4.19.152","v5.9-rc1","v4.14.202","v4.9.240","v4.4.240","v5.9-rc7","v4.4.239","v4.9.239","v4.14.201","v4.19.151","v5.4.71","v5.4.70","v4.19.150","v4.14.200","v4.9.238","v4.4.238","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.4.69","v4.19.149","v5.9-rc3","v4.9.237","v5.4.68","v4.19.148","v4.14.199","v4.4.237","v5.4.67","v4.19.147","v5.9-rc2","v5.4.66","v4.19.146",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