Linux: Off-by-one Error
CVE-2026-52907 is a high-severity off-by-one error vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 73e119036b3a799170ed89907b4273c07306d611, e4056b84af0fc18c84b4e5741df04ecd8ca17973 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 0.11% 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 73e119036b3a799170ed89907b4273c07306d611 or e4056b84af0fc18c84b4e5741df04ecd8ca17973, whichever matches your release line, or a later version.
- Update Linux Kernel to 7.0.4 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 1f2353f5a1af995efbf7bea44341aa0d03460b28 up to, but not including, 73e119036b3a799170ed89907b4273c07306d611; 1f2353f5a1af995efbf7bea44341aa0d03460b28 up to, but not including, e4056b84af0fc18c84b4e5741df04ecd8ca17973; 6.19 | 73e119036b3a799170ed89907b4273c07306d611, e4056b84af0fc18c84b4e5741df04ecd8ca17973 |
| Linux | Linux Kernel | 6.19 up to, but not including, 7.0.4 | 7.0.4 |
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
- HighData or code can be modified at will.
- 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:H/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: media: rockchip: rkcif: fix off by one bugs Change these comparisons from > vs >= to avoid accessing one element beyond the end of the arrays. While at it, use ARRAY_SIZE instead of the _MAX enum values. [fix cosmetic issues]
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Off-by-one Error
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
How developers prevent this class of flaw
- When copying character arrays or using character manipulation methods, the correct size parameter must be used to account for the null terminator that needs to be added at the end of the array. Some examples of functions susceptible to this weakness in C include strcpy(), strncpy(), strcat(), strncat(), printf(), sprintf(), scanf() and sscanf().
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Off-by-one Error vulnerabilities
- 8.6 High severity
- 7.5 High severity
- 7.1 High severity
- 8.1 High severity
- 7.8 High severity
- 7.1 High severity
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