# CVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability

- Exploited (CISA KEV): yes, added 2026-05-01
- Published: 2026-04-22
- CVSS: 7.8 HIGH (v3.1)
- EPSS: 98.1% (100th percentile)
- CWE: CWE-669

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Social

1 posts seen since 2026-10-29.

- hn 2026-10-29: > Linux seems to have a huge attack surface that doesn't necessarily need to be there for every user/server. IIRC it was CVE-2026-31431 earlier this year that made me go audit what modules were loaded and go on a whole hardening kick. As far as I understood, the vulnerable modul… (https://news.ycombinator.com/item?id=50297817)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

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