Bug 2536803 (CVE-2026-90222)

Summary: CVE-2026-90222 kernel: nfc: pn533: hold a reference to the request skb during send_frame
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's Near Field Communication (NFC) PN533 driver. A race condition can occur during frame transmission where a memory buffer is prematurely released while the I2C transport is still attempting to use it. This use-after-free vulnerability can lead to system instability or a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description OSIDB Bzimport 2026-09-17 19:34:58 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nfc: pn533: hold a reference to the request skb during send_frame

__pn533_send_async() publishes the command and then calls
dev->phy_ops->send_frame(). Once dev->cmd is set, an incoming frame
can be matched to this command: the I2C threaded IRQ runs
pn533_recv_frame(), which queues cmd_complete_work, and
pn533_send_async_complete() frees cmd->req with consume_skb().

On the I2C transport, pn533_i2c_send_frame() still dereferences the same
skb after i2c_master_send() returns, so a completion that races the
send can free the skb while the transport is still using it.

The request skb is owned by the command object and may be freed by
command completion at any time after dev->cmd is published, so the
transport send path must not assume it stays alive. Hold a temporary
reference to the request skb across the send_frame() call so the
transport always sees a live skb even if completion races the send.
Add a pn533_send_cmd_frame() helper and use it from all three send
paths.
Comment 1 Mauro Matteo Cascella 2026-09-24 13:38:31 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90222.mbox