| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value\n\nCurrently, when the rule related to IDLETIMER is added, idletimer_tg timer\nstructure is initialized by kmalloc on executing idletimer_tg_create\nfunction. However, in this process timer->timer_type is not defined to\na specific value. Thus, timer->timer_type has garbage value and it occurs\nkernel panic. So, this commit fixes the panic by initializing\ntimer->timer_type using kzalloc instead of kmalloc.\n\nTest commands:\n # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test\n $ cat /sys/class/xt_idletimer/timers/test\n Killed\n\nSplat looks like:\n BUG: KASAN: user-memory-access in alarm_expires_remaining+0x49/0x70\n Read of size 8 at addr 0000002e8c7bc4c8 by task cat/917\n CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n Call Trace:\n dump_stack_lvl+0x6e/0x9c\n kasan_report.cold+0x112/0x117\n ? alarm_expires_remaining+0x49/0x70\n __asan_load8+0x86/0xb0\n alarm_expires_remaining+0x49/0x70\n idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d]\n dev_attr_show+0x3c/0x60\n sysfs_kf_seq_show+0x11d/0x1f0\n ? device_remove_bin_file+0x20/0x20\n kernfs_seq_show+0xa4/0xb0\n seq_read_iter+0x29c/0x750\n kernfs_fop_read_iter+0x25a/0x2c0\n ? __fsnotify_parent+0x3d1/0x570\n ? iov_iter_init+0x70/0x90\n new_sync_read+0x2a7/0x3d0\n ? __x64_sys_llseek+0x230/0x230\n ? rw_verify_area+0x81/0x150\n vfs_read+0x17b/0x240\n ksys_read+0xd9/0x180\n ? vfs_write+0x460/0x460\n ? do_syscall_64+0x16/0xc0\n ? lockdep_hardirqs_on+0x79/0x120\n __x64_sys_read+0x43/0x50\n do_syscall_64+0x3b/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f0cdc819142\n Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24\n RSP: 002b:00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\n RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f0cdc819142\n RDX: 0000000000020000 RSI: 00007f0cdc032000 RDI: 0000000000000003\n RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000\n R10: 0000000000000022 R11: 0000000000000246 R12: 00005607e9ee31f0\n R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/netfilter/xt_IDLETIMER.c" |
| ], |
| "versions": [ |
| { |
| "version": "68983a354a655c35d3fb204489d383a2a051fda7", |
| "lessThan": "2a670c323055282c9b72794a491d53cef86bbeaf", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "68983a354a655c35d3fb204489d383a2a051fda7", |
| "lessThan": "cae7cab804c943d723d52724a3aeb07a3f4a2650", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "68983a354a655c35d3fb204489d383a2a051fda7", |
| "lessThan": "902c0b1887522a099aa4e1e6b4b476c2fe5dd13e", |
| "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/netfilter/xt_IDLETIMER.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.7", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.7", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.76", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.14.15", |
| "lessThanOrEqual": "5.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.7", |
| "versionEndExcluding": "5.10.76" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.7", |
| "versionEndExcluding": "5.14.15" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.7", |
| "versionEndExcluding": "5.15" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e" |
| } |
| ], |
| "title": "netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47451", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
