CVE-2021-22555 · netVigilance record NV25-0193
Linux Kernel Heap Out-of-Bounds Write
past due
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA deadline 2025-10-27 · passed 10 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
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.
Who is affected
Linux Kernel. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-787.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 10 months ago
Sources
- NVD entry for CVE-2021-22555 nvd.nist.gov/vuln/detail/CVE-2021-22555
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- git.kernel.org git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21
- git.kernel.org git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d
- security.netapp.com security.netapp.com/advisory/ntap-20210805-0010/
- github.com github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2021-22555