CVE-2026-80578
CVE CVE-2026-80578EUVD EUVD-2026-66493Published 2026-08-26T14:37:36.000ZLast changed 2026-08-27T05:01:59.000ZCVSS 7.3
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: fbdev: core: Fix pointer desynchronization in fb_io_read() In fb_io_read(), if copy_to_user() performs a partial copy (e.g., due to a faulty user buffer), the loop adjusts the chunk size 'c' and updates the remaining 'count'. However, the hardware 'src' pointer has already been eagerly advanced by the original chunk size. If the loop is allowed to continue, the read will resume from an incorrect, over-advanced offset. Since the remaining 'count' was only decremented by the successful bytes, this desynchronization causes the next iterations to execute more hardware reads than originally bounded, eventually leading to out-of-bounds I/O reads. Fix this by breaking out of the loop immediately upon a partial copy_to_user(). A partial copy indicates a faulty user buffer, making subsequent read attempts futile. Breaking out ensures we return the number of successfully read bytes without risking out-of-bounds hardware accesses in subsequent mismatched iterations.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.6.153; 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff <42a6d8126c194133eafab2b0fd5c8668ebfcba5b; 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff <81cc73be40c6f028f1ee3f438ace46afe666dbae; 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff <42bc07b4e5a3c8a02a433388f562a8f46d093e11; patch: 7.2; patch: 6.12.105; patch: 0; patch: 7.1.10; patch: 6.18.46; 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff <7110b7b794a2aac2c5cf8eb06ebf2af724c74d50; 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff <7ff87a01ae3a8cd0208f7499386998223a8b5dba; 6.5
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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