9.8

CVE-2026-74436: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-74436DEBIAN-CVE-2026-74436
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74436 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.40%
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 9 · Related 9
USN-8781-1USN-8816-1USN-8816-2USN-8816-3USN-8816-4USN-8888-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

0.00 pp

From 0.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.40%

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

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.5-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < d6207326b4ca0ae1041281b6af9df53f8080669a | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 11b429b84c87cb5a0152f14e7d6cb649ed363901 | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < c20d983968f239574290cf804a58cde18ad1c559 | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 0337cdba0c477f176c0459bed012109453184573 | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5 | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 35a967ff8b24db09ee429c39c5b5e6571639997d | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < 1741378a7a83dfd8e53a9196730df709b903cd33 | ≥ 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, < dc175389b18c29a5303ee83169ec653adfae3e17 | 4.9

3 vendors · 171 products

References

21 links
Show all 21 references