CVE-2026-49422

highpriority · track · 0EPSS 0.002 · 6 %ileDERUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.17% (6th) EPSS

CVSS 7.8 · high

Is it mine?

20 products

Check your exposure

Who says so?

3 sources

fstec_bdu · cert_bund · nvd

EPSS · scored 2026-10-27

The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block. If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory. The bug may be exploitable by an unprivileged local user to escalate privileges.

cvss

Technical severity, 0–10. One row per scoring source.

8.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.8highAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.4highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.5 · impact 5.9

v3.17.7highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USCWE-416US

affected products (20)

Products and version ranges known to be affected.

FreeBSD Project FreeBSD OS <14.3-RELEASE-p16all versionscert_bundDE
FreeBSD Project FreeBSD OS <14.4-RELEASE-p7all versionscert_bundDE
FreeBSD Project FreeBSD OS <14.4-STABLEall versionscert_bundDE
FreeBSD Project FreeBSD OS <15.0-RELEASE-p11all versionscert_bundDE
FreeBSD Project FreeBSD OS <15.1-RELEASE-p1all versionscert_bundDE
FreeBSD Project FreeBSD OS <15.1-STABLEall versionscert_bundDE
FreeBSD Project FreeBSD OS< 14.3-RELEASE-p16cert_bundDE
FreeBSD Project FreeBSD OS< 14.4-RELEASE-p7cert_bundDE
FreeBSD Project FreeBSD OS< 14.4-STABLEcert_bundDE
FreeBSD Project FreeBSD OS< 15.0-RELEASE-p11cert_bundDE
FreeBSD Project FreeBSD OS< 15.1-RELEASE-p1cert_bundDE
FreeBSD Project FreeBSD OS< 15.1-STABLEcert_bundDE
FreeBSD Project FreeBSD14.3 → 14.3-RELEASE-p16fstec_bduRU
FreeBSD Project FreeBSD14.4 → 14.4-RELEASE-p7fstec_bduRU
FreeBSD Project FreeBSD15.0 → 15.0-RELEASE-p11fstec_bduRU
FreeBSD Project FreeBSD15.1 → 15.1-RELEASE-p1fstec_bduRU
freebsd freebsd= 14.3nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 14.4nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 15.0nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd= 15.1nvdUScpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2165FreeBSD Project FreeBSD OS: Mehrere SchwachstellenDeutsch2026-06-30csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in FreeBSD Project FreeBSD OS ausnutzen, um seine Privilegien zu erhöhen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Denial of Service Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

also known as (1)

Other names and identifiers for this entity.

BDU:2026-11349 fstec_bdu

sources

Which sources assert this record, and when.

fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2026-08-19modified 2026-09-01

references (1) nvd

External citations — patches, advisories, analysis.

https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.ascVendor Advisory

scry

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