HIGH

CVE-2021-22555

Linux Linux Kernel 2021-07-07 CVSS v3.1

CVSS

7.8

KEV

Description

A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space

Summary dbcve.org

Heap out-of-bounds write vulnerability in net/netfilter/x_tables.c affecting Linux kernels since v2.6.19-rc1 allows local attackers to gain elevated privileges or cause denial of service via heap memory corruption through user namespace interaction.

Mitigation

Apply the upstream kernel patch or update to a kernel version containing the fix (Linux 5.10.13, 5.4.97, or later). This is a privilege escalation vulnerability requiring local access but with high impact due to heap corruption.

Proof of Concept

Patch Commit

Weakness (CWE)

CWE-787 Out-of-bounds Write

EPSS Score

78.68%

Probability of exploitation in next 30 days

99.6th percentile

References

http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html Exploit, Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html Exploit, Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html Exploit, Third Party Advisory, VDB Entry https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 Mailing List, Patch, Vendor Advisory https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d Mailing List, Patch, Vendor Advisory https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 Exploit, Third Party Advisory https://security.netapp.com/advisory/ntap-20210805-0010/ Third Party Advisory https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22555 US Government Resource

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Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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