Linux: Out-of-bounds Read
CVE-2026-31569 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 126053d0a685bf1f2e98db8966386f38b2336338, 2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3, b97bd69eb0f67b5f961b304d28e9ba45e202d841 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.12% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 126053d0a685bf1f2e98db8966386f38b2336338 or 2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3 or b97bd69eb0f67b5f961b304d28e9ba45e202d841, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.18.21 or 6.19.11, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 3956a52bc05bd811082a3c9d2b423ee957e6fefc up to, but not including, 126053d0a685bf1f2e98db8966386f38b2336338; 3956a52bc05bd811082a3c9d2b423ee957e6fefc up to, but not including, 2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3; 3956a52bc05bd811082a3c9d2b423ee957e6fefc up to, but not including, b97bd69eb0f67b5f961b304d28e9ba45e202d841; 6.13 | 126053d0a685bf1f2e98db8966386f38b2336338, 2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3, b97bd69eb0f67b5f961b304d28e9ba45e202d841 |
| Linux | Linux Kernel | 6.13.1 up to, but not including, 6.18.21; 6.19 up to, but not including, 6.19.11; 6.13; 7.0 | 6.18.21, 6.19.11 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Handle the case that EIOINTC's coremap is empty EIOINTC's coremap in eiointc_update_sw_coremap() can be empty, currently we get a cpuid with -1 in this case, but we actually need 0 because it's similar as the case that cpuid >= 4. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.8 High severity
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