| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: do not perform operations on net devices being unregistered\n\nThere is a short period between a net device starts to be unregistered\nand when it is actually gone. In that time frame ethtool operations\ncould still be performed, which might end up in unwanted or undefined\nbehaviours[1].\n\nDo not allow ethtool operations after a net device starts its\nunregistration. This patch targets the netlink part as the ioctl one\nisn't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't be found after unregister.\n\n[1] For example adding Tx queues after unregister ends up in NULL\n pointer exceptions and UaFs, such as:\n\n BUG: KASAN: use-after-free in kobject_get+0x14/0x90\n Read of size 1 at addr ffff88801961248c by task ethtool/755\n\n CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\n Call Trace:\n dump_stack_lvl+0x57/0x72\n print_address_description.constprop.0+0x1f/0x140\n kasan_report.cold+0x7f/0x11b\n kobject_get+0x14/0x90\n kobject_add_internal+0x3d1/0x450\n kobject_init_and_add+0xba/0xf0\n netdev_queue_update_kobjects+0xcf/0x200\n netif_set_real_num_tx_queues+0xb4/0x310\n veth_set_channels+0x1c3/0x550\n ethnl_set_channels+0x524/0x610" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/ethtool/netlink.c" |
| ], |
| "versions": [ |
| { |
| "version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", |
| "lessThan": "7c26da3be1e9843a15b5318f90db8a564479d2ac", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", |
| "lessThan": "cfd719f04267108f5f5bf802b9d7de69e99a99f9", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", |
| "lessThan": "dde91ccfa25fd58f64c397d91b81a4b393100ffa", |
| "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/ethtool/netlink.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.6", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.6", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.87", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.8", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.16", |
| "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": "5.6", |
| "versionEndExcluding": "5.10.87" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.6", |
| "versionEndExcluding": "5.15.8" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.6", |
| "versionEndExcluding": "5.16" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa" |
| } |
| ], |
| "title": "ethtool: do not perform operations on net devices being unregistered", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47517", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
