7.8

CVE-2025-38083: net_sched: prio: fix a race in prio_tune()

Modified
AliasesUBUNTU-CVE-2025-38083USN-7681-1USN-7681-2
Published 20-06-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-38083 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 110 · Related 105
DLA-4327-1DLA-4328-1DSA-5973-1MGASA-2025-0218MGASA-2025-0219SUSE-SU-2025:02249-1

Showing 100 of 110.

Timeline

  1. 20-06-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.15% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu139 products
  • linux< 5.4.0-220.240 | < 5.15.0-151.161 | < 6.8.0-71.71
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1149.159 | < 5.15.0-1089.96 | < 6.8.0-1033.35
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 53d11560e957d53ee87a0653d258038ce12361b7 | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 4483d8b9127591c60c4eb789d6cab953bc4522a9 | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 46c15c9d0f65c9ba857d63f53264f4b17e8a715f | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < e3f6745006dc9423d2b065b90f191cfa11b1b584 | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < 93f9eeb678d4c9c1abf720b3615fa8299a490845 | ≥ 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7, < d35acc1be3480505b5931f17e4ea9b7617fea4d3 | 5.0
  • linux_kernel≥ 5.0, < 5.4.295 | ≥ 5.5, < 5.10.239 | ≥ 5.11, < 5.15.186 | ≥ 5.16, < 6.1.142 | ≥ 6.2, < 6.6.94 | ≥ 6.7, < 6.12.34 | ≥ 6.13, < 6.15.3 | 6.16:rc1

3 vendors · 143 products

References

41 links
Show all 41 references