CVE-2026-90224

nfc: nci: fix double completion race in nci_data_exchange_complete

State: Published
Severity: 7.5 High
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

nfc: nci: fix double completion race in nci_data_exchange_complete

nci_close_device() and nci_rx_work can both call nci_data_exchange_complete() concurrently. After commit 4527025d440ce8 ("nfc: nci: fix circular locking dependency in nci_close_device") moved flush_workqueue(ndev->rx_wq) after mutex_unlock(&ndev->req_lock), rx_work is no longer serialized with the explicit completion call in the close path. Both callers read the non-NULL callback pointer and invoke rawsock_data_exchange_complete(), which calls sock_put() -- but only one sock_hold() was taken, so the second sock_put() underflows the refcount and frees the socket while it is still in use.

Replace the bare clear_bit(NCI_DATA_EXCHANGE) with test_and_clear_bit() so that only the first caller proceeds to invoke the callback.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7ed00a3edc8597fe2333f524401e2889aa1b5edf to before 3f075832734005310740d148d1cf1c1e792ebdcaAffected 5eef9ebec7f5738f12cadede3545c05b34bf5ac3 to before 588ccd19a6e69eca72d54608c3ab3b45709b2305Affected ca54e904a071aa65ef3ad46ba42d51aaac6b73b4 to before cf646a9f5554bc07d6ccb59c327812b3a0c6a368Affected eb435d150ca74b4d40f77f1a2266f3636ed64a79 to before 9030a1bbe2c6b1e3e54cef462d159b5248f09fd2Affected 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289 to before bfdf412208fea7fc0d5b32d68a35b25261917393Affected d89b74bf08f067b55c03d7f999ba0a0e73177eb3 to before ba4c776af3dc21ed04e315e6545e99703bb1b53aAffected 4527025d440ce84bf56e75ce1df2e84cb8178616 to before ee08414d78b851e3d1856d6e4d631939b01a1bbeAffected 4527025d440ce84bf56e75ce1df2e84cb8178616 to before 8265a626cc14a48e46e6dc8c47667e72b4232ac2Affected 09143c0e8f3b03517e6233aad42f45c794d8df8eAffected 5.10.253 to before 5.10.270Affected 5.15.203 to before 5.15.221Affected 6.1.168 to before 6.1.188Affected 6.6.131 to before 6.6.157Affected 6.12.80 to before 6.12.110Affected 6.18.21 to before 6.18.52Affected 6.19.11 to before 6.20Affected
LinuxLinux	7.0Affected before 7.0Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

7ed00a3edc8597fe2333f524401e2889aa1b5edf to before 3f075832734005310740d148d1cf1c1e792ebdcaAffected
5eef9ebec7f5738f12cadede3545c05b34bf5ac3 to before 588ccd19a6e69eca72d54608c3ab3b45709b2305Affected
ca54e904a071aa65ef3ad46ba42d51aaac6b73b4 to before cf646a9f5554bc07d6ccb59c327812b3a0c6a368Affected
eb435d150ca74b4d40f77f1a2266f3636ed64a79 to before 9030a1bbe2c6b1e3e54cef462d159b5248f09fd2Affected
1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289 to before bfdf412208fea7fc0d5b32d68a35b25261917393Affected
d89b74bf08f067b55c03d7f999ba0a0e73177eb3 to before ba4c776af3dc21ed04e315e6545e99703bb1b53aAffected
4527025d440ce84bf56e75ce1df2e84cb8178616 to before ee08414d78b851e3d1856d6e4d631939b01a1bbeAffected
4527025d440ce84bf56e75ce1df2e84cb8178616 to before 8265a626cc14a48e46e6dc8c47667e72b4232ac2Affected
09143c0e8f3b03517e6233aad42f45c794d8df8eAffected
5.10.253 to before 5.10.270Affected
5.15.203 to before 5.15.221Affected
6.1.168 to before 6.1.188Affected
6.6.131 to before 6.6.157Affected
6.12.80 to before 6.12.110Affected
6.18.21 to before 6.18.52Affected
6.19.11 to before 6.20Affected

LinuxLinux

7.0Affected
before 7.0Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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