7.8

CVE-2023-53559: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2023-53559DEBIAN-CVE-2023-53559
Published 04-10-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2023-53559 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 19 · Related 17
RHSA-2024:2394RHSA-2024:3138SUSE-SU-2025:21040-1SUSE-SU-2025:21052-1SUSE-SU-2025:21056-1SUSE-SU-2025:21064-1

Timeline

  1. 04-10-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ip_vti: fix potential slab-use-after-free in decode_session6 When ip_vti device is set to the qdisc of the sfb type, the cb field of the sent skb may be modified during enqueuing. Then, slab-use-after-free may occur when ip_vti device sends IPv6 packets. As commit f855691975bb ("xfrm6: Fix the nexthdr offset in _decode_session6.") showed, xfrm_decode_session was originally intended only for the receive path. IP6CB(skb)->nhoff is not set during transmission. Therefore, set the cb field in the skb to 0 before sending packets.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu123 products
  • linuxAll versions (No fix recorded) | < 5.4.0-169.187 | < 5.15.0-91.101
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1116.126 | < 5.15.0-1051.56
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f855691975bb06373a98711e4cfe2c224244b536, < 82fb41c5de243e7dfa90f32ca58e35adaff56c1d | ≥ f855691975bb06373a98711e4cfe2c224244b536, < 7dfe23659f3677c08a60a0056cda2d91a79c15ca | ≥ f855691975bb06373a98711e4cfe2c224244b536, < d34c30442d5e53a33cde79ca163320dbe2432cbd | ≥ f855691975bb06373a98711e4cfe2c224244b536, < 0b4d69539fdea138af2befe08893850c89248068 | ≥ f855691975bb06373a98711e4cfe2c224244b536, < e1e04cc2ef2c0c0866c19f5627149a76c2baae32 | ≥ f855691975bb06373a98711e4cfe2c224244b536, < 2b05bf5dc437f7891dd409a3eaf5058459391c7a | ≥ f855691975bb06373a98711e4cfe2c224244b536, < 78e397a43e1c47321a4679cc49a6c4530bf820b9 | ≥ f855691975bb06373a98711e4cfe2c224244b536, < 6018a266279b1a75143c7c0804dd08a5fc4c3e0b | 3.19
  • linux_kernel≥ 3.19.1, < 4.14.324 | ≥ 4.15, < 4.19.293 | ≥ 4.20, < 5.4.255 | ≥ 5.5, < 5.10.192 | ≥ 5.11, < 5.15.128 | ≥ 5.16, < 6.1.47 | ≥ 6.2, < 6.4.12 | 3.19 | 3.19:rc7 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3 | 6.5:rc4 | 6.5:rc5 | 6.5:rc6
Debian1 product
  • linux< 6.1.52-1 | < 6.4.13-1

3 vendors · 126 products

References

12 links
Show all 12 references