{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47352","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.985Z","datePublished":"2024-05-21T14:35:56.473Z","dateUpdated":"2026-08-05T08:47:24.845Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:47:24.845Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The used length is taken from the virtio used ring written by the device backend (hypervisor/vhost/VDUSE), not from packet payload, so a remote network peer cannot forge it; exploitation requires a locally attached malicious virtio-net device.\nAC:L - The attacker fully controls the used-ring length field and can reliably supply an oversized value on every completed RX buffer with no race or other conditions outside their control.\nPR:N - No privileges on the victim guest are required; a malicious virtio backend can kick the RX virtqueue and the NAPI path in receive_small/receive_mergeable processes the forged length automatically.\nUI:N - Exploitation occurs entirely in the automatic softirq/NAPI receive path when the device completes buffers; no user action is needed.\nS:U - Impact is confined to the guest kernel that runs the virtio-net driver; this is host/device-to-guest corruption within that OS authority, not a guest-to-host or cross-VM escape.\nC:H - An oversized used length can overlap skb_shared_info or drive XDP with a past-the-end data_end, yielding out-of-bounds reads of adjacent kernel memory; memory-corruption bugs of this class are scored C:H.\nI:H - The same oversized length enables skb_shared_info / buffer corruption and XDP out-of-bounds writes before the post-XDP mergeable check, which is exploitable for integrity compromise and control-flow hijacking as the fix notes (data corruption).\nA:H - Lengths beyond skb tailroom hit skb_over_panic, and corrupted RX/sk_buff state can oops or panic the guest kernel, so availability impact is High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/virtio_net.c"],"versions":[{"version":"f6b10209b90d48a84f886ab2b317b5d2cbfe3143","lessThan":"c1b40d1959517ff2ea473d40eeab4691d6d62462","status":"affected","versionType":"git"},{"version":"f6b10209b90d48a84f886ab2b317b5d2cbfe3143","lessThan":"c92298d228f61589dd21657af2bea95fc866b813","status":"affected","versionType":"git"},{"version":"f6b10209b90d48a84f886ab2b317b5d2cbfe3143","lessThan":"3133e01514c3c498f2b01ff210ee6134b70c663c","status":"affected","versionType":"git"},{"version":"f6b10209b90d48a84f886ab2b317b5d2cbfe3143","lessThan":"ba710baa1cc1b17a0483f7befe03e696efd17292","status":"affected","versionType":"git"},{"version":"f6b10209b90d48a84f886ab2b317b5d2cbfe3143","lessThan":"ad993a95c508417acdeb15244109e009e50d8758","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/net/virtio_net.c"],"versions":[{"version":"4.11","status":"affected"},{"version":"0","lessThan":"4.11","status":"unaffected","versionType":"semver"},{"version":"5.4.293","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.51","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.18","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.3","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","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":"4.11","versionEndExcluding":"5.4.293"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.10.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.12.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c1b40d1959517ff2ea473d40eeab4691d6d62462"},{"url":"https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"},{"url":"https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"},{"url":"https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"},{"url":"https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"}],"title":"virtio-net: Add validation for used length","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.505Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47352","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:38:39.694535Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:48.464Z"}}]}}