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Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2026-50255)

high Nessus Plugin ID 311798

Synopsis

The remote Oracle Linux host is missing a security update.

Description

The remote Oracle Linux 7 / 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-50255 advisory.

 - crypto: algif_aead - use memcpy_sglist() instead of null skcipher (Eric Biggers) [Orabug: 39292250] {CVE-2026-31431}
 - macvlan: fix possible UAF in macvlan_forward_source() (Eric Dumazet) [Orabug: 38887731] {CVE-2026-23001}
 - macvlan: fix error recovery in macvlan_common_newlink() (Eric Dumazet) [Orabug: 38970510] {CVE-2026-23209}
 - io_uring: fix filename leak in __io_openat_prep() (Prithvi Tambewagh) [Orabug: 39064937] {CVE-2025-68814}
 - xfrm: also call xfrm_state_delete_tunnel at destroy time for states that were never added (Sabrina Dubroca) [Orabug: 38934000,39004270] {CVE-2025-40256}
 - xfrm: delete x->tunnel as we delete x (Sabrina Dubroca) [Orabug: 38730493,39016501] {CVE-2025-40215}
 - crypto: af_alg - Fix incorrect boolean values in af_alg_ctx (Eric Biggers) [Orabug:
 38879907,38884602,39004445] {CVE-2025-40022}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://linux.oracle.com/errata/ELSA-2026-50255.html

Plugin Details

Severity: High

ID: 311798

File Name: oraclelinux_ELSA-2026-50255.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/2/2026

Updated: 5/2/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-31431

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:oracle:linux:8:10:baseos_patch, p-cpe:/a:oracle:linux:kernel-uek-container, p-cpe:/a:oracle:linux:kernel-uek-debug-devel, cpe:/o:oracle:linux:7, cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:kernel-uek-debug, p-cpe:/a:oracle:linux:kernel-uek-devel, p-cpe:/a:oracle:linux:kernel-uek-doc, p-cpe:/a:oracle:linux:kernel-uek-container-debug, p-cpe:/a:oracle:linux:kernel-uek-tools, p-cpe:/a:oracle:linux:kernel-uek

Required KB Items: Host/OracleLinux, Host/RedHat/release, Host/RedHat/rpm-list, Host/local_checks_enabled

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/1/2026

Vulnerability Publication Date: 4/22/2026

CISA Known Exploited Vulnerability Due Dates: 5/15/2026

Reference Information

CVE: CVE-2026-31431