Linux: Out-of-bounds Read
CVE-2026-45893 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 83939c2afba70b49062c31ca6a6de7f46951d26d, 1fbc4b24c7443ffd501609be74d9856fb940d703, 47e351dfef60ab0e3285133556e1a9c7f646a969 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 83939c2afba70b49062c31ca6a6de7f46951d26d or 1fbc4b24c7443ffd501609be74d9856fb940d703 or 47e351dfef60ab0e3285133556e1a9c7f646a969 or e027999049c493fb728ead5a90db76942181a935, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.12.75 or 6.18.14 or 6.19.4, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, 83939c2afba70b49062c31ca6a6de7f46951d26d; e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, 1fbc4b24c7443ffd501609be74d9856fb940d703; e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, 47e351dfef60ab0e3285133556e1a9c7f646a969; e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, e027999049c493fb728ead5a90db76942181a935; e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, 226c3b10aab23f73b03c47e7773107de56ba3a4e; e6e8bf418850d7958311a96ccfb594f2bcc8313e up to, but not including, 6fc367bfd4c8886e6b1742aabbd1c0bdc310db3a; 4.11 | 83939c2afba70b49062c31ca6a6de7f46951d26d, 1fbc4b24c7443ffd501609be74d9856fb940d703, 47e351dfef60ab0e3285133556e1a9c7f646a969, e027999049c493fb728ead5a90db76942181a935, 226c3b10aab23f73b03c47e7773107de56ba3a4e, 6fc367bfd4c8886e6b1742aabbd1c0bdc310db3a |
| Linux | Linux Kernel | 4.11 up to, but not including, 6.12.75; 6.13 up to, but not including, 6.18.14; 6.19 up to, but not including, 6.19.4 | 6.12.75, 6.18.14, 6.19.4 |
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 NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix & Optimize table creation from possibly unaligned memory Source blob may come from userspace and might be unaligned. Try to optize the copying process by avoiding unaligned memory accesses. - Added Fixes tag - Added "Fix &" to description as this doesn't just optimize but fixes a potential unaligned memory access [jj: remove duplicate word "convert" in comment trigger checkpatch warning]
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
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 8.2 High severity
- 7.1 High severity
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