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net: lan966x: restore RX state on reload failure

Assessment

Severity
Moderate
CVSS base score
4.1CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Impact
Not stated
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Mariner
Weakness
—
Issued by
Linux
Published
24 Oct 2026 · October 2026
Last revised
24 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
LocalAV:L
Attack complexity
HighAC:H
Privileges required
HighPR:H
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product
  • azl3 kernel 6.6.157.1-1 on Azure Linux 3.0
Page history

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Explore global source statements, affected packages and advisory history for CVE-2026-98906. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-98906

Published

net: lan966x: restore RX state on reload failure

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: restore RX state on reload failure lan966x_fdma_reload() backs up rx->page_pool and rx->fdma before reallocating the RX resources for the new MTU. If the allocation fails, the restore path puts these fields back before restarting RX. However, the reload path also updates rx->page_order and rx->max_mtu before calling lan966x_fdma_rx_alloc(). These fields are not restored on failure, so RX can be restarted with the old pages, old FDMA state and old page pool, but with the page geometry from the failed new MTU. This can make the XDP path advertise a frame size derived from the new page_order while the actual RX pages still come from the old allocation. For example, after a failed reload to a jumbo MTU, xdp_init_buff() may be called with a frame size larger than the restored RX pages. lan966x_fdma_rx_alloc_page_pool() also registers the newly allocated page pool with each port's XDP RXQ before fdma_alloc_coherent() is called. If fdma_alloc_coherent() fails, the new page pool is destroyed, but the rollback path does not restore the per-port XDP RXQ mem model registration either. Save and restore rx->page_order and rx->max_mtu, and restore the old page pool registration for each port's XDP RXQ before RX is started again. This keeps the restored RX state consistent after a failed reload.

Source published
23 Oct 2026 11:54:42 UTC
Source modified
26 Oct 2026 06:56:35 UTC
Observed here
26 Oct 2026 08:20:49 UTC
Source terms
CVE Program Terms of Use

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