High [CVE-2026-64414] handle unreadable frags
This high-severity Red Hat Linux advisory covers CVE-2026-64414 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: handle unreadable frags sashiko reports: When an skb with unreadable fragments (such as from devmem TCP, where skb_frags_readable(skb) returns false) is processed by the u32 module, skb_copy_bits() will safely return a negative error code [..] xt_u32: bail out with hotdrop in this case. gather_frags: return -1, just as if we had no fragment header. nfnetlink_queue: restrict to the linear part. nfnetlink_log: restrict to the linear part. v2: - skb_zerocopy helpers don't copy readable flag, i.e. nfnetlink_queue is broken too xt_u32 shouldn't return true if hotdrop was set.
This vulnerability occurs when the u32 module processes network packets containing unreadable fragments, leading to improper handling of these fragments. A remote attacker could exploit this flaw by sending specially crafted network traffic, potentially causing a denial of service (DoS) on the affected system.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-390.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat fixing advisory: RHSA-2026:68507.
Affected products named by the advisory: Red Hat package: kernel.
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 26 days ago·verify at source
- kernel-0:6.12.0-211.56.1.el10_2
- RHSA-2026:68507
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.56.1.el10_2, RHSA-2026:68507. 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 26 days ago·verify at source
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