8.4

CVE-2026-74631: linux

CVSS: 8.4v3.1HighReceived
AliasesUBUNTU-CVE-2026-74631DEBIAN-CVE-2026-74631
Published 22-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74631 is a high (CVSS 8.4) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
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 6 · Related 5
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4640-1SUSE-SU-2026:4660-1SUSE-SU-2026:4706-1USN-8886-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.14% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.14%

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

Ubuntu165 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
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < 07ad246529d136d5ef441d5ab4c305d132ff3090 | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < c841789e456ec6751342fa800639ce8e82ff0e6b | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < af02c67ce654356c58db20a0bb2db33ace3b07a8 | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < ca8342b5fc24c249fdb998468f6a168b457c67e5 | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0 | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < 4515c78f4d9fd577270f012efeb062ea58b3682d | ≥ 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f, < 5d9686af2976741bbd79b150d1c9e60b81e7f12e | 4.18

3 vendors · 168 products

References

13 links
Show all 13 references