Bug 2457837 (CVE-2026-31417)

Summary: CVE-2026-31417 kernel: net/x25: Fix overflow when accumulating packets
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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A flaw was found in the Linux kernel's X.25 network protocol implementation (net/x25). An attacker could potentially trigger an integer overflow in the `x25_sock.fraglen` variable when accumulating packets. This oversight, combined with the `fraglen` not being properly reset, may lead to system instability or a denial of service.
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Description OSIDB Bzimport 2026-04-13 14:02:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/x25: Fix overflow when accumulating packets

Add a check to ensure that `x25_sock.fraglen` does not overflow.

The `fraglen` also needs to be resetted when purging `fragment_queue` in
`x25_clear_queues()`.
Comment 1 Keith Grant 2026-04-13 16:57:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026041310-CVE-2026-31417-d47b@gregkh/T