VulnerabilityAnalyzed
CVE-2021-33033
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.
HIGH 7.8EPSS 0.57%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.57% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing List, Patch, Vendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing List, Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8Mailing List, Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08Mailing List, Patch, Vendor Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genoptExploit, Third Party Advisory
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploit, Mailing List, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing List, Patch, Vendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing List, Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8Mailing List, Patch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08Mailing List, Patch, Vendor Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genoptExploit, Third Party Advisory
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploit, Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.