5.5

CVE-2025-38037: debian debian_linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2025-38037DEBIAN-CVE-2025-38037
Published 18-06-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-38037 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.6% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.22%
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 34 · Related 31
DLA-4327-1DLA-4328-1DSA-5973-1USN-7704-1USN-7704-2USN-7704-3

Timeline

  1. 18-06-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: vxlan: Annotate FDB data races The 'used' and 'updated' fields in the FDB entry structure can be accessed concurrently by multiple threads, leading to reports such as [1]. Can be reproduced using [2]. Suppress these reports by annotating these accesses using READ_ONCE() / WRITE_ONCE(). [1] BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0: vxlan_xmit+0xb29/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2: vxlan_xmit+0xadf/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f Reported by Kernel Concurrency Sanitizer on: CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [2] #!/bin/bash set +H echo whitelist > /sys/kernel/debug/kcsan echo !vxlan_xmit > /sys/kernel/debug/kcsan ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1 bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1 taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q & taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.22%

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

No weakness data has been published for this record.

Affected systems

Ubuntu146 products
  • linuxAll versions (No fix recorded) | < 5.15.0-152.162 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1090.97 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < 02a33b1035a307453a1da6ce0a1bf3676be287d7 | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < 87d076987a9ba106c83412fcd113656f71af05a1 | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < e033da39fc6abbddab6c29624acef80757f273fa | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < 784b78295a3a58bf052339dd669e6e03710220d3 | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < 13cba3f837903f7184d6e9b6137d5165ffe82a8f | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < a6644aeb8ddf196dec5f8e782293c36f065df4d7 | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < 4eceb7eae6ea7c950384c34e6dbbe872c981935f | ≥ d342894c5d2f8c7df194c793ec4059656e09ca31, < f6205f8215f12a96518ac9469ff76294ae7bd612 | 3.7
  • linux_kernel≥ 3.7, < 5.4.294 | ≥ 5.5, < 5.10.238 | ≥ 5.11, < 5.15.185 | ≥ 5.16, < 6.1.141 | ≥ 6.2, < 6.6.93 | ≥ 6.7, < 6.12.31 | ≥ 6.13, < 6.14.9

3 vendors · 150 products

References

46 links
Show all 46 references