Bug 2454804 (CVE-2026-23445)

Summary: CVE-2026-23445 kernel: igc: fix page fault in XDP TX timestamps handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's igc network driver. When an XDP (eXpress Data Path) application that requests transmit (TX) timestamping is shut down while the network interface link remains active, the driver fails to properly clear stale `xsk_meta` pointers. This improper cleanup can lead to a page fault, potentially causing a system crash and resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-04-03 16:01:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

igc: fix page fault in XDP TX timestamps handling

If an XDP application that requested TX timestamping is shutting down
while the link of the interface in use is still up the following kernel
splat is reported:

[  883.803618] [   T1554] BUG: unable to handle page fault for address: ffffcfb6200fd008
...
[  883.803650] [   T1554] Call Trace:
[  883.803652] [   T1554]  <TASK>
[  883.803654] [   T1554]  igc_ptp_tx_tstamp_event+0xdf/0x160 [igc]
[  883.803660] [   T1554]  igc_tsync_interrupt+0x2d5/0x300 [igc]
...

During shutdown of the TX ring the xsk_meta pointers are left behind, so
that the IRQ handler is trying to touch them.

This issue is now being fixed by cleaning up the stale xsk meta data on
TX shutdown. TX timestamps on other queues remain unaffected.
Comment 1 Jon Moroney 2026-04-03 19:40:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040315-CVE-2026-23445-d003@gregkh/T