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ReviewHigh

CVE-2026-80560

Linux

In the Linux kernel, the following vulnerability has been resolved: openrisc: signal: do not restore privileged SR bits on sigreturn restore_sigcontext() copies the whole supervision register (SR) from the signal frame and only clears SPR_SR_SM before the value is reloaded into the hardware SR (through ESR and l.rfe) on the return to user space. All other SR bits are left under user control. An unprivileged task can thus return from a signal handler through a crafted sigframe that clears SPR_SR_DME. With the data MMU disabled the CPU performs no translation or protection on data accesses, s...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: openrisc: signal: do not restore privileged SR bits on sigreturn restore_sigcontext() copies the whole supervision register (SR) from the signal frame and only clears SPR_SR_SM before the value is reloaded into the hardware SR (through ESR and l.rfe) on the return to user space. All other SR bits are left under user control. An unprivileged task can thus return from a signal handler through a crafted sigframe that clears SPR_SR_DME. With the data MMU disabled the CPU performs no translation or protection on data accesses, s...

Affected product and versions

Product
Linux
Affected versions
>= ac689eb7f9d4e270d1365853b82eece669387e2c < bc2e24ba6e167ccf374a197457aa5640a802f429, >= ac689eb7f9d4e270d1365853b82eece669387e2c < cf1b5514ddf9df098ce7e3741fc9679fd85a4ec6, >= ac689eb7f9d4e270d1365853b82eece669387e2c < cd8b43a71755c516f5c1f265a103438ae9ab15be, >= ac689eb7f9d4e270d1365853b82eece669387e2c < b4d73c3848bae9084fa8b9b2aa76d99a7d8eb17d, >= ac689eb7f9d4e270d1365853b82eece669387e2c < 89a91b30685c0493b0fa2b47d0ab41061a63069d, >= ac689eb7f9d4e270d1365853b82eece669387e2c < a88d688be8d7f03cbf927f2ab454ea9fa58d2979, >= ac689eb7f9d4e270d1365853b82eece669387e2c < 212fc482ddd7f9ccdd74a05eab1cac849350dcd6, >= ac689eb7f9d4e270d1365853b82eece669387e2c < 32ef1b30ad736519f7a207bcc2986f3d4129d972, >= 3.1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available