| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vlan: fix underflow for the real_dev refcnt\n\nInject error before dev_hold(real_dev) in register_vlan_dev(),\nand execute the following testcase:\n\nip link add dev dummy1 type dummy\nip link add name dummy1.100 link dummy1 type vlan id 100\nip link del dev dummy1\n\nWhen the dummy netdevice is removed, we will get a WARNING as following:\n\n=======================================================================\nrefcount_t: decrement hit 0; leaking memory.\nWARNING: CPU: 2 PID: 0 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0\n\nand an endless loop of:\n\n=======================================================================\nunregister_netdevice: waiting for dummy1 to become free. Usage count = -1073741824\n\nThat is because dev_put(real_dev) in vlan_dev_free() be called without\ndev_hold(real_dev) in register_vlan_dev(). It makes the refcnt of real_dev\nunderflow.\n\nMove the dev_hold(real_dev) to vlan_dev_init() which is the call-back of\nndo_init(). That makes dev_hold() and dev_put() for vlan's real_dev\nsymmetrical." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/8021q/vlan.c", |
| "net/8021q/vlan_dev.c" |
| ], |
| "versions": [ |
| { |
| "version": "700602b662d7eaa816b1a3cb0abe7a85de358fd4", |
| "lessThan": "5e44178864b38dd70b877985abd7d86fdb95f27d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e04a7a84bb77f9cdf4475340fe931389bc72331c", |
| "lessThan": "6e800ee43218a56acc93676bbb3d93b74779e555", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "21032425c36ff85f16e72ca92193a8c401e4acd5", |
| "lessThan": "f7fc72a508cf115c273a7a29350069def1041890", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "563bcbae3ba233c275c244bfce2efe12938f5363", |
| "lessThan": "01d9cc2dea3fde3bad6d27f464eff463496e2b00", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "fca96b3f852a1b369b7b2844ce357cd689879934", |
| "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/8021q/vlan.c", |
| "net/8021q/vlan_dev.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.4.160", |
| "lessThan": "5.4.163", |
| "status": "affected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.80", |
| "lessThan": "5.10.83", |
| "status": "affected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.3", |
| "lessThan": "5.15.6", |
| "status": "affected", |
| "versionType": "semver" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.4.160", |
| "versionEndExcluding": "5.4.163" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.10.80", |
| "versionEndExcluding": "5.10.83" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.15.3", |
| "versionEndExcluding": "5.15.6" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.14.19" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/5e44178864b38dd70b877985abd7d86fdb95f27d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/6e800ee43218a56acc93676bbb3d93b74779e555" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/f7fc72a508cf115c273a7a29350069def1041890" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/01d9cc2dea3fde3bad6d27f464eff463496e2b00" |
| } |
| ], |
| "title": "net: vlan: fix underflow for the real_dev refcnt", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47555", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
