VulnerabilityModified

CVE-2021-33909

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.

HIGH 7.8EPSS 9.73%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (9.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CVSS 3.1: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 9.73% probability · 95th percentile
CISA KEV: Not listed
Weakness: CWE-190, CWE-787
Affected: linux/linux kernel · fedoraproject/fedora · debian/debian linux · netapp/hci management node · netapp/solidfire · oracle/communications session border controller · sonicwall/sma1000 firmware
Source: cve@mitre.org

References

http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/07/22/7Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/25/10Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53bPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00014.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00015.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00016.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015Third Party Advisory
https://security.netapp.com/advisory/ntap-20210819-0004/Third Party Advisory
https://www.debian.org/security/2021/dsa-4941Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/07/20/1Exploit, Mailing List, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/07/22/7Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/25/10Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4Mailing List, Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.