| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure tx skbs always have the MPTCP ext\n\nDue to signed/unsigned comparison, the expression:\n\n\tinfo->size_goal - skb->len > 0\n\nevaluates to true when the size goal is smaller than the\nskb size. That results in lack of tx cache refill, so that\nthe skb allocated by the core TCP code lacks the required\nMPTCP skb extensions.\n\nDue to the above, syzbot is able to trigger the following WARN_ON():\n\nWARNING: CPU: 1 PID: 810 at net/mptcp/protocol.c:1366 mptcp_sendmsg_frag+0x1362/0x1bc0 net/mptcp/protocol.c:1366\nModules linked in:\nCPU: 1 PID: 810 Comm: syz-executor.4 Not tainted 5.14.0-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:mptcp_sendmsg_frag+0x1362/0x1bc0 net/mptcp/protocol.c:1366\nCode: ff 4c 8b 74 24 50 48 8b 5c 24 58 e9 0f fb ff ff e8 13 44 8b f8 4c 89 e7 45 31 ed e8 98 57 2e fe e9 81 f4 ff ff e8 fe 43 8b f8 <0f> 0b 41 bd ea ff ff ff e9 6f f4 ff ff 4c 89 e7 e8 b9 8e d2 f8 e9\nRSP: 0018:ffffc9000531f6a0 EFLAGS: 00010216\nRAX: 000000000000697f RBX: 0000000000000000 RCX: ffffc90012107000\nRDX: 0000000000040000 RSI: ffffffff88eac9e2 RDI: 0000000000000003\nRBP: ffff888078b15780 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff88eac017 R11: 0000000000000000 R12: ffff88801de0a280\nR13: 0000000000006b58 R14: ffff888066278280 R15: ffff88803c2fe9c0\nFS: 00007fd9f866e700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007faebcb2f718 CR3: 00000000267cb000 CR4: 00000000001506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n __mptcp_push_pending+0x1fb/0x6b0 net/mptcp/protocol.c:1547\n mptcp_release_cb+0xfe/0x210 net/mptcp/protocol.c:3003\n release_sock+0xb4/0x1b0 net/core/sock.c:3206\n sk_stream_wait_memory+0x604/0xed0 net/core/stream.c:145\n mptcp_sendmsg+0xc39/0x1bc0 net/mptcp/protocol.c:1749\n inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:643\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n sock_write_iter+0x2a0/0x3e0 net/socket.c:1057\n call_write_iter include/linux/fs.h:2163 [inline]\n new_sync_write+0x40b/0x640 fs/read_write.c:507\n vfs_write+0x7cf/0xae0 fs/read_write.c:594\n ksys_write+0x1ee/0x250 fs/read_write.c:647\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\nRIP: 0033:0x4665f9\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fd9f866e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665f9\nRDX: 00000000000e7b78 RSI: 0000000020000000 RDI: 0000000000000003\nRBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038\nR13: 0000000000a9fb1f R14: 00007fd9f866e300 R15: 0000000000022000\n\nFix the issue rewriting the relevant expression to avoid\nsign-related problems - note: size_goal is always >= 0.\n\nAdditionally, ensure that the skb in the tx cache always carries\nthe relevant extension." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/mptcp/protocol.c" |
| ], |
| "versions": [ |
| { |
| "version": "e35820fb56415be6924bf552ec223ed5f347b4be", |
| "lessThan": "f8ff625a8082db8c2b58dcb5229b27928943b94b", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1094c6fe7280e17e0e87934add5ad2585e990def", |
| "lessThan": "977d293e23b48a1129830d7968605f61c4af71a0", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/mptcp/protocol.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.14.7", |
| "lessThan": "5.14.9", |
| "status": "affected", |
| "versionType": "semver" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.14.7", |
| "versionEndExcluding": "5.14.9" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/f8ff625a8082db8c2b58dcb5229b27928943b94b" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/977d293e23b48a1129830d7968605f61c4af71a0" |
| } |
| ], |
| "title": "mptcp: ensure tx skbs always have the MPTCP ext", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47370", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
