{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Get user_ns from in_skb in unix_diag_get_exact().\n\nWei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosed\nthe root cause: in unix_diag_get_exact(), the newly allocated skb does not\nhave sk. [2]\n\nWe must get the user_ns from the NETLINK_CB(in_skb).sk and pass it to\nsk_diag_fill().\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000270\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0\nOops: 0000 [#1] PREEMPT SMP\nCPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nrel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014\nRIP: 0010:sk_user_ns include/net/sock.h:920 [inline]\nRIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline]\nRIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170\nCode: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e8\n54 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd <48> 8b\n9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8d\nRSP: 0018:ffffc90000d67968 EFLAGS: 00010246\nRAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481d\nRDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270\nRBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000\nR10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800\nR13: ffff88812c87c400 R14: ffff88812ae42210 R15: ffff888103026940\nFS: 00007f08b4e6f700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000270 CR3: 000000012c58b000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n unix_diag_get_exact net/unix/diag.c:285 [inline]\n unix_diag_handler_dump+0x3f9/0x500 net/unix/diag.c:317\n __sock_diag_cmd net/core/sock_diag.c:235 [inline]\n sock_diag_rcv_msg+0x237/0x250 net/core/sock_diag.c:266\n netlink_rcv_skb+0x13e/0x250 net/netlink/af_netlink.c:2564\n sock_diag_rcv+0x24/0x40 net/core/sock_diag.c:277\n netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]\n netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1356\n netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1932\n sock_sendmsg_nosec net/socket.c:714 [inline]\n sock_sendmsg net/socket.c:734 [inline]\n ____sys_sendmsg+0x38f/0x500 net/socket.c:2476\n ___sys_sendmsg net/socket.c:2530 [inline]\n __sys_sendmsg+0x197/0x230 net/socket.c:2559\n __do_sys_sendmsg net/socket.c:2568 [inline]\n __se_sys_sendmsg net/socket.c:2566 [inline]\n __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x4697f9\nCode: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48\n89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d\n01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f08b4e6ec48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 000000000077bf80 RCX: 00000000004697f9\nRDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003\nRBP: 00000000004d29e9 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 000000000077bf80\nR13: 0000000000000000 R14: 000000000077bf80 R15: 00007ffdb36bc6c0\n \nModules linked in:\nCR2: 0000000000000270\n\n[1]: https://lore.kernel.org/netdev/CAO4mrfdvyjFpokhNsiwZiP-wpdSD0AStcJwfKcKQdAALQ9_2Qw@mail.gmail.com/\n[2]: https://lore.kernel.org/netdev/e04315e7c90d9a75613f3993c2baf2d344eef7eb.camel@redhat.com/" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/diag.c" ], "versions": [ { "version": "cae9910e7344", "lessThan": "c66d78aee55d", "status": "affected", "versionType": "git" }, { "version": "cae9910e7344", "lessThan": "575a6266f63d", "status": "affected", "versionType": "git" }, { "version": "cae9910e7344", "lessThan": "5c014eb0ed6c", "status": "affected", "versionType": "git" }, { "version": "cae9910e7344", "lessThan": "9c1d6f79a2c7", "status": "affected", "versionType": "git" }, { "version": "cae9910e7344", "lessThan": "b3abe42e9490", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/diag.c" ], "versions": [ { "version": "5.3", "status": "affected" }, { "version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.227", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.159", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.83", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.0.13", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c66d78aee55dab72c92020ebfbebc464d4f5dd2a" }, { "url": "https://git.kernel.org/stable/c/575a6266f63dbb3b8eb1da03671451f0d81b8034" }, { "url": "https://git.kernel.org/stable/c/5c014eb0ed6c8c57f483e94cc6e90f34ce426d91" }, { "url": "https://git.kernel.org/stable/c/9c1d6f79a2c7b8221dcec27defc6dc461052ead4" }, { "url": "https://git.kernel.org/stable/c/b3abe42e94900bdd045c472f9c9be620ba5ce553" } ], "title": "af_unix: Get user_ns from in_skb in unix_diag_get_exact().", "x_generator": { "engine": "bippy-c9c4e1df01b2" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2022-48970", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }