idpf: detach and close netdevs while handling a reset

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Summary

CVECVE-2026-22981
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-23 16:15:54 UTC
Updated2026-04-02 12:16:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: idpf: detach and close netdevs while handling a reset Protect the reset path from callbacks by setting the netdevs to detached state and close any netdevs in UP state until the reset handling has completed. During a reset, the driver will de-allocate resources for the vport, and there is no guarantee that those will recover, which is why the existing vport_ctrl_lock does not provide sufficient protection. idpf_detach_and_close() is called right before reset handling. If the reset handling succeeds, the netdevs state is recovered via call to idpf_attach_and_open(). If the reset handling fails the netdevs remain down. The detach/down calls are protected with RTNL lock to avoid racing with callbacks. On the recovery side the attach can be done without holding the RTNL lock as there are no callbacks expected at that point, due to detach/close always being done first in that flow. The previous logic restoring the netdevs state based on the IDPF_VPORT_UP_REQUESTED flag in the init task is not needed anymore, hence the removal of idpf_set_vport_state(). The IDPF_VPORT_UP_REQUESTED is still being used to restore the state of the netdevs following the reset, but has no use outside of the reset handling flow. idpf_init_hard_reset() is converted to void, since it was used as such and there is no error handling being done based on its return value. Before this change, invoking hard and soft resets simultaneously will cause the driver to lose the vport state: ip -br a <inf> UP echo 1 > /sys/class/net/ens801f0/device/reset& \ ethtool -L ens801f0 combined 8 ip -br a <inf> DOWN ip link set <inf> up ip -br a <inf> DOWN Also in case of a failure in the reset path, the netdev is left exposed to external callbacks, while vport resources are not initialized, leading to a crash on subsequent ifup/down: [408471.398966] idpf 0000:83:00.0: HW reset detected [408471.411744] idpf 0000:83:00.0: Device HW Reset initiated [408472.277901] idpf 0000:83:00.0: The driver was unable to contact the device's firmware. Check that the FW is running. Driver state= 0x2 [408508.125551] BUG: kernel NULL pointer dereference, address: 0000000000000078 [408508.126112] #PF: supervisor read access in kernel mode [408508.126687] #PF: error_code(0x0000) - not-present page [408508.127256] PGD 2aae2f067 P4D 0 [408508.127824] Oops: Oops: 0000 [#1] SMP NOPTI ... [408508.130871] RIP: 0010:idpf_stop+0x39/0x70 [idpf] ... [408508.139193] Call Trace: [408508.139637] <TASK> [408508.140077] __dev_close_many+0xbb/0x260 [408508.140533] __dev_change_flags+0x1cf/0x280 [408508.140987] netif_change_flags+0x26/0x70 [408508.141434] dev_change_flags+0x3d/0xb0 [408508.141878] devinet_ioctl+0x460/0x890 [408508.142321] inet_ioctl+0x18e/0x1d0 [408508.142762] ? _copy_to_user+0x22/0x70 [408508.143207] sock_do_ioctl+0x3d/0xe0 [408508.143652] sock_ioctl+0x10e/0x330 [408508.144091] ? find_held_lock+0x2b/0x80 [408508.144537] __x64_sys_ioctl+0x96/0xe0 [408508.144979] do_syscall_64+0x79/0x3d0 [408508.145415] entry_SYSCALL_64_after_hwframe+0x76/0x7e [408508.145860] RIP: 0033:0x7f3e0bb4caff

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 6.19 rc1 All All
Operating System Linux Linux Kernel 6.19 rc2 All All
Operating System Linux Linux Kernel 6.19 rc3 All All
Operating System Linux Linux Kernel 6.19 rc4 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0fe45467a1041ea3657a7fa3a791c84c104fbd34 9ad3d0836d8bc1a0f0b4bf56efc56312a9e64b97 git Not specified
CNA Linux Linux affected 0fe45467a1041ea3657a7fa3a791c84c104fbd34 ac122f5fb050903b3d262001562c452be95eaf70 git Not specified
CNA Linux Linux affected 0fe45467a1041ea3657a7fa3a791c84c104fbd34 2e281e1155fc476c571c0bd2ffbfe28ab829a5c3 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.6 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ac122f5fb050903b3d262001562c452be95eaf70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2e281e1155fc476c571c0bd2ffbfe28ab829a5c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9ad3d0836d8bc1a0f0b4bf56efc56312a9e64b97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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