CVE-2026-74436

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Source
https://cve.org/CVERecord?id=CVE-2026-74436
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74436.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-74436
Downstream
Published
2026-08-15T05:59:34Z
Modified
2026-08-25T03:51:23Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
rxrpc: serialize kernel accept preallocation with socket teardown
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74436.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
00e907127e6f86d0f9b122d9b4347a8aa09a8b61
Fixed
d6207326b4ca0ae1041281b6af9df53f8080669a
Fixed
11b429b84c87cb5a0152f14e7d6cb649ed363901
Fixed
c20d983968f239574290cf804a58cde18ad1c559
Fixed
0337cdba0c477f176c0459bed012109453184573
Fixed
dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5
Fixed
35a967ff8b24db09ee429c39c5b5e6571639997d
Fixed
1741378a7a83dfd8e53a9196730df709b903cd33
Fixed
dc175389b18c29a5303ee83169ec653adfae3e17

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74436.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.9.0
Fixed
5.10.266
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.217
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.184
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.148
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.101
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.40
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74436.json"