CVE-2026-31431Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability
CVE-2026-31431 is a vulnerability in Linux Kernel, rated high (7.8 on CVSS 3.1).
Why this priority: Exploited in the wild: listed in CISA's KEV catalog.
Published · Updated · NVD status: Analyzed
What it is
The record does not classify the weakness yet; the description below says what the reporter found.
How it is reached
An attacker can exploit it by someone who can already run code or sign in on the machine, with an ordinary user account, and nobody has to click anything.
What an attacker gains
A successful attack can read the data it protects, change data or behaviour and take it offline.
Is it being exploited?
CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-01: it is being exploited in the wild. EPSS estimates a 98% chance of exploitation activity in the next 30 days, higher than 100% of scored CVEs.
What to do
- Treat it as urgent: it is on CISA's KEV list. CISA's deadline for US federal agencies: 2026-05-15.
- No fixed version is listed for Linux Kernel itself; fixed versions for the other affected products are listed on this page.
- Limit who can run code or sign in on the hosts that run it.
- Check exposed instances for signs of compromise, not only for the version.
Description from NVD
In the Linux kernel, the following vulnerability has been resolved:
crypto: algif_aead - Revert to operating out-of-place
This mostly reverts commit 72548b093ee3 except for the copying of the associated data.
There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.
What this means for your architecture.
A CVE names a product. Whether it matters depends on where that product sits in your systems: what reaches it, which trust boundary it guards and what it can reach once compromised. Veriom maps your components, their relationships and your trust boundaries from your code, cloud and delivery evidence, so you can see where a component like this sits. The radar itself does not look at your systems.
Components it touches
- Operating systems on servers, workstations or devices. Everything on the host inherits the flaw.
Trust boundaries in play
- Host boundary. The attacker needs a foothold on the machine first; the flaw turns a small foothold into a bigger one.
Questions to answer about your own systems
- Where does Linux Kernel run in your systems, and at which version?
- Which of those hosts also run code or users you do not fully trust?
- What can it reach once compromised: which data stores, secrets and services?
Read more
Patches and commits
- git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c
- git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc
- git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667
- git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82
- git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b
- git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
- git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237
- git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
- www.openwall.com/lists/oss-security/2026/04/29/23
- www.openwall.com/lists/oss-security/2026/04/29/25
- www.openwall.com/lists/oss-security/2026/04/29/26
- www.openwall.com/lists/oss-security/2026/04/30/10
Exploits and proofs of concept
More reading
- www.openwall.com/lists/oss-security/2026/04/30/17
- www.openwall.com/lists/oss-security/2026/04/30/2
- www.openwall.com/lists/oss-security/2026/04/30/20
- www.openwall.com/lists/oss-security/2026/04/30/6
- www.openwall.com/lists/oss-security/2026/05/01/10
- www.openwall.com/lists/oss-security/2026/05/01/12
- www.openwall.com/lists/oss-security/2026/05/01/15
- www.openwall.com/lists/oss-security/2026/05/01/16
- www.openwall.com/lists/oss-security/2026/05/01/17
- www.openwall.com/lists/oss-security/2026/05/01/18
- www.openwall.com/lists/oss-security/2026/05/01/2
- www.openwall.com/lists/oss-security/2026/05/01/22
Sources
- CVE records and CVSS scores from the NVD CVE API. This product uses the NVD API but is not endorsed or certified by the NVD.
- Exploitation status from CISA’s Known Exploited Vulnerabilities catalog.
- Exploit likelihood from FIRST’s Exploit Prediction Scoring System (EPSS), refreshed daily.
- Explanations are written by Veriom from fixed templates over each record’s data, not by a person reviewing each CVE. Descriptions are quoted from the records as published.