7.8

CVE-2026-89548: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-89548DEBIAN-CVE-2026-89548
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-89548 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
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 12 · Related 11
MGASA-2026-0506OPENSUSE-SU-2026:11880-1OPENSUSE-SU-2026:22091-1SUSE-SU-2026:24179-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: always drain cache_cleaner before destroying a cache_detail sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty. During per-netns teardown cache_list is never empty because init_net's caches remain registered, so the cancel never fires. After unlink, the caller proceeds to cache_destroy_net() which kfrees the cache_detail while cache_clean() may still hold a dangling pointer to it. The result is a use-after-free: cache_dequeue() takes cd->queue_lock on freed memory, and cache_put() dereferences cd->cache_put as a function pointer from freed slab. Drop the list_empty guard so that cancel_delayed_work_sync() always runs, ensuring any in-flight cache_clean() completes before the cache_detail is freed. Re-arm the cleaner afterwards if other caches are still registered.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < 5eea874a696201c31e7c2d7badbfa0d90e9961b5 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < cf239de7fdcc8336259b01ea4bcf650dadad1040 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < 6d74ecc2be120a0c300b224b7649fe93c0453714 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < 9d44836f60c8c29bcdb1471fd9202387c642a890 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < 3d60fdf951143d6ef4e352e2f8eb852286701726 | ≥ 820f9442e711a81749e70c40f149fc54c4ce0ca8, < f42d0fda0c67695db6bc704b04b7c10240805377 | 3.4

3 vendors · 172 products

References

13 links
Show all 13 references