Coverage › CVE-2021-22555
CVE-2021-22555 Unmapped
Linux Kernel Heap Out-of-Bounds Write Vulnerability
- Vendor / product
- Linux — Kernel
- Description (CISA)
- 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.
- Added to KEV
- 2025-10-06 — after the latest CTID mapping snapshot (2025-07-28)
- Due date
- 2025-10-27
- 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.
- Known ransomware use
- Unknown
- CWE
- CWE-787
- CISA 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 - Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2021-22555. This entry was added to KEV on 2025-10-06, after that snapshot; of the 283 entries added since, 0 have a mapping. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-787) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.