Vulnerability Description
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.11.14 |
Related Weaknesses (CWE)
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing ListPatchVendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=11Mailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adMailing ListPatchVendor Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genExploitThird Party Advisory
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploitMailing ListThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing ListPatchVendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=11Mailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adMailing ListPatchVendor Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genExploitThird Party Advisory
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploitMailing ListThird Party Advisory
FAQ
What is CVE-2021-33033?
CVE-2021-33033 is a vulnerability with a CVSS score of 7.8 (HIGH). The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. ...
How severe is CVE-2021-33033?
CVE-2021-33033 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-33033?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.