net/packet: avoid fanout hook re-registration after unregister

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68338
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:24 UTC
Updated2026-08-19 17:20:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/packet: avoid fanout hook re-registration after unregister packet_set_ring() temporarily detaches a socket from packet delivery while reconfiguring its ring. It records the previous running state, clears po->num, unregisters the protocol hook when needed, drops po->bind_lock, and later restores po->num and re-registers the hook from the saved was_running value. That unlocked window can race with NETDEV_UNREGISTER. The notifier can observe the socket as not running, skip __unregister_prot_hook(), and invalidate the per-socket binding by setting po->ifindex to -1 and clearing po->prot_hook.dev. A one-member fanout group can still retain its shared fanout hook device pointer. When packet_set_ring() resumes, re-registering solely from the stale was_running state can re-add the fanout hook after the device has been unregistered. Treat po->ifindex == -1 as an invalidated binding after reacquiring po->bind_lock. This is distinct from ifindex 0, the normal unbound/wildcard state: ifindex -1 marks an existing device binding that was invalidated when the device was unregistered. Restore po->num as before, but do not re-register the hook if device unregister already detached the socket.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001750000 probability, percentile 0.073370000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc acb40ebfa5c4d62f84339fcbf713f2a9fd033a71 git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc c820f4b7f2fa38f8769db0d0cefdd94e2721504d git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc 4628efbdc7affd094181f5263e65c1062e31f15f git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc 80ec024d53a05c60ad1d08968dcf745f10c1665c git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc 0a052e0808e015e68144a9877e6ef42b952c49fa git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc 1bc55c29cd85818e9052f17deb287d5a11fb817f git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc a885387dae7986a55bae5c77a15bdd447f64e9b9 git Not specified
CNA Linux Linux affected dc99f600698dcac69b8f56dda9a8a00d645c5ffc 50aff80475abd3533eef4320477037e6fcc6b56e git Not specified
CNA Linux Linux affected 3.1 Not specified
CNA Linux Linux unaffected 3.1 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50aff80475abd3533eef4320477037e6fcc6b56e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1bc55c29cd85818e9052f17deb287d5a11fb817f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/acb40ebfa5c4d62f84339fcbf713f2a9fd033a71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4628efbdc7affd094181f5263e65c1062e31f15f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c820f4b7f2fa38f8769db0d0cefdd94e2721504d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80ec024d53a05c60ad1d08968dcf745f10c1665c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a885387dae7986a55bae5c77a15bdd447f64e9b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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