Linux: Out-of-bounds Read
CVE-2026-68447 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 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 1218c6dcec80f886372635e82f3229d5babc37d3, a0d87beb2660a5098b2b0ecdc1e96810a9074ea9, 426ffae6ecc7ec77d32bf8be065c21a1b881b084 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 0.16% 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 1218c6dcec80f886372635e82f3229d5babc37d3 or a0d87beb2660a5098b2b0ecdc1e96810a9074ea9 or 426ffae6ecc7ec77d32bf8be065c21a1b881b084, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 3a9822d7bd623be9000cef8101ecf8479fa53f2c up to, but not including, 1218c6dcec80f886372635e82f3229d5babc37d3; 3a9822d7bd623be9000cef8101ecf8479fa53f2c up to, but not including, a0d87beb2660a5098b2b0ecdc1e96810a9074ea9; 3a9822d7bd623be9000cef8101ecf8479fa53f2c up to, but not including, 426ffae6ecc7ec77d32bf8be065c21a1b881b084; 5.18 | 1218c6dcec80f886372635e82f3229d5babc37d3, a0d87beb2660a5098b2b0ecdc1e96810a9074ea9, 426ffae6ecc7ec77d32bf8be065c21a1b881b084 |
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
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component 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:U/C:H/I:N/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size CRIU checkpoint copies the MQD control stack using cp_hqd_cntl_stack_size from hardware without bounding it to the allocated BO region. If the HW field is larger than the queue's control stack allocation, memcpy reads past the BO into adjacent GTT memory and can leak kernel data to userspace. Store the page-aligned control stack BO size in mqd_manager and clamp checkpoint copies and reported checkpoint sizes to min(cp_hqd_cntl_stack_size, mm->ctl_stack_size). Apply the same bound for multi-XCC v9.4.3 checkpoint layout. (cherry picked from commit 6c2abd0ec09e86c6323010673766f76050e28aa3)
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.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.5 High severity
- 8.6 High severity
- 7.1 High severity
- 7.1 High severity
- 7.0 High severity
- 8.8 High severity
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