{"schema_version":"1","data":[{"id":322,"advisory_id":"564bd9e5-5817-4b6f-a686-31abbd0e94dc","revision":1,"source_id":"core-kev","source_url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22555","source_published_at":"2025-10-06T00:00:00+00:00","published_at":"2026-10-24T20:43:26.052075+00:00","extraction_method":"structured","technologies":["core-kev","kernel"],"cve_ids":["CVE-2021-22555"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Linux Kernel Heap Out-of-Bounds Write Vulnerability","summary":"Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","evidence":"kev:CVE-2021-22555","products":[{"name":{"value":"Kernel","evidence":"/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2021-22555","aliases":["CVE-2021-22555"],"affected":[],"modified":"2025-10-06T00:00:00.000Z","provider":"kev","references":["https://www.cisa.gov/known-exploited-vulnerabilities-catalog"],"exploitation":{"cwes":["CWE-787"],"cveID":"CVE-2021-22555","notes":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 ; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d ; https://security.netapp.com/advisory/ntap-20210805-0010/ ; https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 ; https://nvd.nist.gov/vuln/detail/CVE-2021-22555","dueDate":"2025-10-27","product":"Kernel","dateAdded":"2025-10-06","vendorProject":"Linux","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","known_exploited":true,"shortDescription":"Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.","vulnerabilityName":"Linux Kernel Heap Out-of-Bounds Write Vulnerability","knownRansomwareCampaignUse":"Unknown"}},"related_cves":[{"value":"CVE-2021-22555","evidence":"/cveID"}],"security_relevant":true,"severity_evidence":null},"priority":{"reasons":["known_exploited"],"severity":"unknown","linked_cves":[],"fix_available":false,"known_exploited":true,"publisher_severity":"unknown"},"context_update":false}],"next_after":322,"next_before":322}