Vulnerability Description
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.12.43, < 3.13 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 9.0 |
| Netapp | Hci Management Node | - |
| Netapp | Solidfire | - |
| Oracle | Communications Session Border Controller | 8.2 |
| Sonicwall | Sma1000 Firmware | <= 12.4.2-02044 |
| Sonicwall | Sma1000 | - |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-FilesyExploitThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2021/07/22/7Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/08/25/10Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing ListThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4Mailing ListPatchVendor Advisory
- https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00014.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00015.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00016.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-33909?
CVE-2021-33909 is a vulnerability with a CVSS score of 7.8 (HIGH). fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by...
How severe is CVE-2021-33909?
CVE-2021-33909 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-2021-33909?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Fedoraproject Fedora, Debian Debian Linux, Netapp Hci Management Node, Netapp Solidfire.