OESA-2026-3986

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3986
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-3986.json
JSON Data
https://api.test.osv.dev/v1/vulns/OESA-2026-3986
Upstream
Published
2026-09-20T13:23:51Z
Modified
2026-09-20T13:30:24Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
kernel security update
Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

sctp: validate STALE_COOKIE cause length before reading staleness

When an ERROR chunk with a STALE_COOKIE cause is received in the COOKIE_ECHOED state, sctp_sf_do_5_2_6_stale() reads the 4-byte Measure of Staleness that follows the cause header:

err   = (struct sctp_errhdr *)(chunk->skb->data);
stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err)));

err is the first cause in the chunk, not the STALE_COOKIE cause that caused the dispatch, and nothing guarantees the staleness field is present. sctp_walk_errors() only requires a cause to be as long as the 4-byte header, so for a STALE_COOKIE cause of length 4 the read runs past the cause, and for a minimal ERROR chunk past skb->tail. The value is echoed to the peer in the Cookie Preservative of the reply INIT, leaking uninitialized memory.

sctp_sf_cookie_echoed_err() already walks to the STALE_COOKIE cause, so check its length there and pass it to sctp_sf_do_5_2_6_stale(), which reads that cause instead of the first one. A STALE_COOKIE cause too short to hold the staleness field is discarded.

The read is reachable by any peer that can drive an association into COOKIE_ECHOED, including an unprivileged process using a raw SCTP socket in a user and network namespace.(CVE-2026-64551)

Database specific 
{
    "severity":  "Critical"
}
References

Affected packages

openEuler:22.03-LTS-SP4 / kernel

Package

Name
kernel
Purl
pkg:rpm/openEuler/kernel&distro=openEuler-22.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.10.0-332.0.0.233.oe2203sp4

Ecosystem specific 

{
    "aarch64":  [
        "bpftool-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "bpftool-debuginfo-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-debuginfo-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-debugsource-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-devel-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-headers-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-source-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-tools-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-tools-debuginfo-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "kernel-tools-devel-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "perf-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "perf-debuginfo-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "python3-perf-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm",
        "python3-perf-debuginfo-5.10.0-332.0.0.233.oe2203sp4.aarch64.rpm"
    ],
    "src":  [
        "kernel-5.10.0-332.0.0.233.oe2203sp4.src.rpm"
    ],
    "x86_64":  [
        "bpftool-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "bpftool-debuginfo-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-debuginfo-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-debugsource-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-devel-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-headers-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-source-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-tools-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-tools-debuginfo-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "kernel-tools-devel-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "perf-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "perf-debuginfo-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "python3-perf-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm",
        "python3-perf-debuginfo-5.10.0-332.0.0.233.oe2203sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3986.json"