{"containers":{"cna":{"affected":[{"product":"Linux","vendor":"Linux","versions":[{"lessThan":"4.12","status":"unknown","version":"unspecified","versionType":"custom"},{"lessThan":"unspecified","status":"affected","version":"5.5.0","versionType":"custom"},{"lessThan":"unspecified","status":"unaffected","version":"next of 5.12.2","versionType":"custom"}]}],"credits":[{"lang":"en","value":"{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Michael Brown of iPXE and diagnosed by\\nOlivier Benjamin, Michael Kurth and Martin Mazein of AWS.'}]}}}"}],"descriptions":[{"lang":"en","value":"Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer."}],"metrics":[{"other":{"content":{"description":{"description_data":[{"lang":"eng","value":"A malicious or buggy frontend driver can trigger a dom0 crash.\nPrivilege escalation and information leaks cannot be ruled out."}]}},"type":"unknown"}}],"problemTypes":[{"descriptions":[{"description":"unknown","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2021-08-05T11:07:09.000Z","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","shortName":"XEN"},"references":[{"tags":["x_refsource_MISC"],"url":"https://xenbits.xenproject.org/xsa/advisory-374.txt"},{"name":"GLSA-202107-30","tags":["vendor-advisory","x_refsource_GENTOO"],"url":"https://security.gentoo.org/glsa/202107-30"},{"tags":["x_refsource_CONFIRM"],"url":"https://security.netapp.com/advisory/ntap-20210805-0002/"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@xen.org","ID":"CVE-2021-28691","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Linux","version":{"version_data":[{"version_affected":"?<","version_value":"4.12"},{"version_affected":">=","version_value":"5.5.0"},{"version_affected":"!>","version_value":"5.12.2"}]}}]},"vendor_name":"Linux"}]}},"configuration":{"configuration_data":{"description":{"description_data":[{"lang":"eng","value":"Systems using Linux version 5.5 or newer are vulnerable."}]}}},"credit":{"credit_data":{"description":{"description_data":[{"lang":"eng","value":"This issue was discovered by Michael Brown of iPXE and diagnosed by\nOlivier Benjamin, Michael Kurth and Martin Mazein of AWS."}]}}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer."}]},"impact":{"impact_data":{"description":{"description_data":[{"lang":"eng","value":"A malicious or buggy frontend driver can trigger a dom0 crash.\nPrivilege escalation and information leaks cannot be ruled out."}]}}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"unknown"}]}]},"references":{"reference_data":[{"name":"https://xenbits.xenproject.org/xsa/advisory-374.txt","refsource":"MISC","url":"https://xenbits.xenproject.org/xsa/advisory-374.txt"},{"name":"GLSA-202107-30","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/202107-30"},{"name":"https://security.netapp.com/advisory/ntap-20210805-0002/","refsource":"CONFIRM","url":"https://security.netapp.com/advisory/ntap-20210805-0002/"}]},"workaround":{"workaround_data":{"description":{"description_data":[{"lang":"eng","value":"On x86 running only HVM guests with emulated network cards will avoid the\nissue.  There's however no option in the upstream toolstack to offer only\nemulated network cards to guests."}]}}}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T21:47:33.196Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://xenbits.xenproject.org/xsa/advisory-374.txt"},{"name":"GLSA-202107-30","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"],"url":"https://security.gentoo.org/glsa/202107-30"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://security.netapp.com/advisory/ntap-20210805-0002/"}]}]},"cveMetadata":{"assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","assignerShortName":"XEN","cveId":"CVE-2021-28691","datePublished":"2021-06-29T11:30:53.000Z","dateReserved":"2021-03-18T00:00:00.000Z","dateUpdated":"2024-08-03T21:47:33.196Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"}