High [CVE-2026-63912] restore combined single-frag length gate
This high-severity Red Hat Linux advisory covers CVE-2026-63912 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag.
The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len.
Restore this combined-length page gate for both IPv4 and IPv6. A flaw was found in the Linux kernel's Encapsulating Security Payload (ESP) component.
An attacker could potentially trigger a scenario where the system rejects the page-fragment fast path, leading to a denial of service (DoS) condition.
Red Hat has rated this vulnerability as Moderate severity because triggering the condition requires an active IPsec configuration using Encapsulating Security Payload (ESP) under specific packet fragmentation criteria, limiting the primary impact to a denial of service rather than arbitrary privilege escalation or unauthorized data access.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 8; and 1 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- kernel-0:5.14.0-687.29.1.el9_8
- RHSA-2026:43307
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:5.14.0-687.29.1.el9_8, RHSA-2026:43307. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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