5.5

CVE-2025-21781: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21781DEBIAN-CVE-2025-21781
Published 27-02-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-21781 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.3% 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 · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 48 · Related 47
DLA-4102-1DLA-4178-1SUSE-SU-2025:01919-1SUSE-SU-2025:1177-1SUSE-SU-2025:1178-1SUSE-SU-2025:1180-1

Timeline

  1. 27-02-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix panic during interface removal Reference counting is used to ensure that batadv_hardif_neigh_node and batadv_hard_iface are not freed before/during batadv_v_elp_throughput_metric_update work is finished. But there isn't a guarantee that the hard if will remain associated with a soft interface up until the work is finished. This fixes a crash triggered by reboot that looks like this: Call trace: batadv_v_mesh_free+0xd0/0x4dc [batman_adv] batadv_v_elp_throughput_metric_update+0x1c/0xa4 process_one_work+0x178/0x398 worker_thread+0x2e8/0x4d0 kthread+0xd8/0xdc ret_from_fork+0x10/0x20 (the batadv_v_mesh_free call is misleading, and does not actually happen) I was able to make the issue happen more reliably by changing hardif_neigh->bat_v.metric_work work to be delayed work. This allowed me to track down and confirm the fix. [sven@narfation.org: prevent entering batadv_v_elp_get_throughput without soft_iface]

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

+0.01 pp

From 0.21% 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

Ubuntu136 products
  • linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-78.78
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1035.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c833484e5f3872a38fe232c663586069d5ad9645, < 167422a07096a6006599067c8b55884064fa0b72 | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < ce3f1545bf8fa28bd05ec113679e8e6cd23af577 | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < f0a16c6c79768180333f3e41ce63f32730e3c3af | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < 7eb5dd201695645af071592a50026eb780081a72 | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < 072b2787321903287a126c148e8db87dd7ef96fe | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < 2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7 | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < 522b1596ea19e327853804da2de60aeb9c5d6f42 | ≥ c833484e5f3872a38fe232c663586069d5ad9645, < ccb7276a6d26d6f8416e315b43b45e15ee7f29e2 | 4.6
  • linux_kernel≥ 4.6, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 6.14:rc1 | 6.14:rc2
Debian1 product
  • linux< 6.1.129-1 | < 6.12.16-1

3 vendors · 139 products

References

53 links
Show all 53 references