9.1

CVE-2023-53600: linux Out-of-bounds Read

CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2023-53600DEBIAN-CVE-2023-53600
Published 04-10-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2023-53600 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.29%
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 10 · Related 10
SUSE-SU-2025:21040-1SUSE-SU-2025:21052-1SUSE-SU-2025:21056-1SUSE-SU-2025:21064-1SUSE-SU-2025:4057-1SUSE-SU-2025:4128-1

Timeline

  1. 04-10-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tunnels: fix kasan splat when generating ipv4 pmtu error If we try to emit an icmp error in response to a nonliner skb, we get BUG: KASAN: slab-out-of-bounds in ip_compute_csum+0x134/0x220 Read of size 4 at addr ffff88811c50db00 by task iperf3/1691 CPU: 2 PID: 1691 Comm: iperf3 Not tainted 6.5.0-rc3+ #309 [..] kasan_report+0x105/0x140 ip_compute_csum+0x134/0x220 iptunnel_pmtud_build_icmp+0x554/0x1020 skb_tunnel_check_pmtu+0x513/0xb80 vxlan_xmit_one+0x139e/0x2ef0 vxlan_xmit+0x1867/0x2760 dev_hard_start_xmit+0x1ee/0x4f0 br_dev_queue_push_xmit+0x4d1/0x660 [..] ip_compute_csum() cannot deal with nonlinear skbs, so avoid it. After this change, splat is gone and iperf3 is no longer stuck.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.29%

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

Ubuntu108 products
  • linux< 5.15.0-91.101
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1051.56
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < 5850c391fd7e25662334cb3cbf29a62bcbff1084 | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < e95808121953410db8c59f0abfde70ac0d34222c | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < fe6a9f7516735be9fdabab00e47ef7a3403a174d | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < 6a7ac3d20593865209dceb554d8b3f094c6bd940 | 5.9
  • linux_kernel≥ 5.9, < 5.10.191 | ≥ 5.11, < 5.15.127 | ≥ 5.16, < 6.1.46 | ≥ 6.2, < 6.4.11 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3 | 6.5:rc4 | 6.5:rc5
Debian1 product
  • linux< 6.1.52-1 | < 6.4.11-1

3 vendors · 111 products

References

9 links