| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: Fix NULL pointer in flush_workqueue\n\nOpen /dev/nbdX first, the config_refs will be 1 and\nthe pointers in nbd_device are still null. Disconnect\n/dev/nbdX, then reference a null recv_workq. The\nprotection by config_refs in nbd_genl_disconnect is useless.\n\n[ 656.366194] BUG: kernel NULL pointer dereference, address: 0000000000000020\n[ 656.368943] #PF: supervisor write access in kernel mode\n[ 656.369844] #PF: error_code(0x0002) - not-present page\n[ 656.370717] PGD 10cc87067 P4D 10cc87067 PUD 1074b4067 PMD 0\n[ 656.371693] Oops: 0002 [#1] SMP\n[ 656.372242] CPU: 5 PID: 7977 Comm: nbd-client Not tainted 5.11.0-rc5-00040-g76c057c84d28 #1\n[ 656.373661] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014\n[ 656.375904] RIP: 0010:mutex_lock+0x29/0x60\n[ 656.376627] Code: 00 0f 1f 44 00 00 55 48 89 fd 48 83 05 6f d7 fe 08 01 e8 7a c3 ff ff 48 83 05 6a d7 fe 08 01 31 c0 65 48 8b 14 25 00 6d 01 00 <f0> 48 0f b1 55 d\n[ 656.378934] RSP: 0018:ffffc900005eb9b0 EFLAGS: 00010246\n[ 656.379350] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n[ 656.379915] RDX: ffff888104cf2600 RSI: ffffffffaae8f452 RDI: 0000000000000020\n[ 656.380473] RBP: 0000000000000020 R08: 0000000000000000 R09: ffff88813bd6b318\n[ 656.381039] R10: 00000000000000c7 R11: fefefefefefefeff R12: ffff888102710b40\n[ 656.381599] R13: ffffc900005eb9e0 R14: ffffffffb2930680 R15: ffff88810770ef00\n[ 656.382166] FS: 00007fdf117ebb40(0000) GS:ffff88813bd40000(0000) knlGS:0000000000000000\n[ 656.382806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 656.383261] CR2: 0000000000000020 CR3: 0000000100c84000 CR4: 00000000000006e0\n[ 656.383819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 656.384370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 656.384927] Call Trace:\n[ 656.385111] flush_workqueue+0x92/0x6c0\n[ 656.385395] nbd_disconnect_and_put+0x81/0xd0\n[ 656.385716] nbd_genl_disconnect+0x125/0x2a0\n[ 656.386034] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0\n[ 656.386422] genl_rcv_msg+0xfc/0x2b0\n[ 656.386685] ? nbd_ioctl+0x490/0x490\n[ 656.386954] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0\n[ 656.387354] netlink_rcv_skb+0x62/0x180\n[ 656.387638] genl_rcv+0x34/0x60\n[ 656.387874] netlink_unicast+0x26d/0x590\n[ 656.388162] netlink_sendmsg+0x398/0x6c0\n[ 656.388451] ? netlink_rcv_skb+0x180/0x180\n[ 656.388750] ____sys_sendmsg+0x1da/0x320\n[ 656.389038] ? ____sys_recvmsg+0x130/0x220\n[ 656.389334] ___sys_sendmsg+0x8e/0xf0\n[ 656.389605] ? ___sys_recvmsg+0xa2/0xf0\n[ 656.389889] ? handle_mm_fault+0x1671/0x21d0\n[ 656.390201] __sys_sendmsg+0x6d/0xe0\n[ 656.390464] __x64_sys_sendmsg+0x23/0x30\n[ 656.390751] do_syscall_64+0x45/0x70\n[ 656.391017] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTo fix it, just add if (nbd->recv_workq) to nbd_disconnect_and_put()." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/block/nbd.c" |
| ], |
| "versions": [ |
| { |
| "version": "e9e006f5fcf2bab59149cb38a48a4817c1b538b4", |
| "lessThan": "1c4962df938891af9ab4775f5224ef8601764107", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e9e006f5fcf2bab59149cb38a48a4817c1b538b4", |
| "lessThan": "cde4b55cfb24522dcbba80bbdb0c082303e76c43", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e9e006f5fcf2bab59149cb38a48a4817c1b538b4", |
| "lessThan": "b31d237796fd618379ec8e0f4de3370b5e4aeee7", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e9e006f5fcf2bab59149cb38a48a4817c1b538b4", |
| "lessThan": "54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e9e006f5fcf2bab59149cb38a48a4817c1b538b4", |
| "lessThan": "79ebe9110fa458d58f1fceb078e2068d7ad37390", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "0b584bf573ae59021069c056c22d65d5721910cb", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9f0f39c92e4f50189155dfb13bb5524372e40eba", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "92ec11cccb7fc14331e000ab2337f60aa433433e", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/block/nbd.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.4", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.4", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.120", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.38", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.11.22", |
| "lessThanOrEqual": "5.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.12.5", |
| "lessThanOrEqual": "5.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.13", |
| "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": "5.4", |
| "versionEndExcluding": "5.4.120" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.10.38" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.11.22" |
| }, |
| { |
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| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.12.5" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4", |
| "versionEndExcluding": "5.13" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.14.149" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.19.79" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.3.6" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390" |
| } |
| ], |
| "title": "nbd: Fix NULL pointer in flush_workqueue", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-46981", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
