CVE-2023-2598: linux linux_kernel Use After Free
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2023-2598
Published 01-06-2023Last modified 23-04-2025
Vulnerability summary
CVE-2023-2598 is a high (CVSS 7.8) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 1.37% chance of exploitation in the next 30 days, higher than 71.6% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
1.37%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 01-06-2023PublishedVulnerability first disclosed.
- 23-04-2025Last modifiedVulnerability information updated.
Description
A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c) in the Linux kernel that allows out-of-bounds access to physical memory beyond the end of the buffer. This flaw enables full local privilege escalation.
CVSS metrics
3 scores · 3 sources · 1 versionHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.37%
Chance of exploitation in the next 30 days
Percentile
72%
Versus all other CVEs
30-day change
0.00 pp
From 1.37% on 21-09-2026
21-09-202621-10-2026
EPSS score1.37%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Ubuntu39 products
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
- linux-aws-5.13All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.8All versions (No fix recorded)
Linux1 product
- linux_kernel≥ 6.3, < 6.3.2
Netapp1 product
- hci_baseboard_management_controllerh300s | h410c | h410s | h500s | h700s
3 vendors · 41 products
References
7 links- security.netapp.com/advisory/ntap-20230703-0006/Third Party Advisory
- www.openwall.com/lists/oss-security/2024/04/24/3Mailing List
