High [CVE-2026-80977] Linux kernel: Information disclosure in network stack due to improper zerocopy state management
This high-severity Red Hat Linux advisory covers CVE-2026-80977.
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Summary
A flaw was found in the Linux kernel's networking subsystem. The `skb_tx_error()` function improperly handles shared zerocopy state in socket buffers (skbs).
When a cloned skb is processed, it can prematurely signal that its pages are free and drop shared fragment flags while the original skb is still in use. This can lead to a scenario where a local ESP (Encapsulating Security Payload) delivery decrypts data into memory fragments that it does not privately own, potentially resulting in information disclosure.
Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H). Weakness: CWE-821.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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