CVE-2025-37914: net_sched: ets: Fix double list add in class with netem as child qdisc
Vulnerability summary
CVE-2025-37914 is a high (CVSS 7.8) Double Free vulnerability in debian debian_linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.1% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 61 · Related 43Timeline
- 20-05-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of ets, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem 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
0.23%
Chance of exploitation in the next 30 days
Percentile
14%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.22% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu140 products
- linuxAll versions (No fix recorded) | < 5.15.0-144.157 | < 6.8.0-100.100
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1088.95 | < 6.8.0-1046.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.140-1 | < 6.12.29-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 554acc5a2ea9703e08023eb9a003f9e5a830a502 | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990 | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3 | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 1f01e9f961605eb397c6ecd1d7b0233dfbf9077c | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < bc321f714de693aae06e3786f88df2975376d996 | ≥ dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33, < 1a6d0c00fa07972384b0c308c72db091d49988b6 | 5.6
- linux_kernel≥ 5.6, < 5.10.238 | ≥ 5.11, < 5.15.182 | ≥ 5.16, < 6.1.138 | ≥ 6.2, < 6.6.90 | ≥ 6.7, < 6.12.28 | ≥ 6.13, < 6.14.6 | 6.15:rc1 | 6.15:rc2 | 6.15:rc3 | 6.15:rc4
3 vendors · 144 products
