net: fix a resource leak in copy_net_ns() error handling path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90077
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:56 UTC
Updated2026-09-17 17:16:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: fix a resource leak in copy_net_ns() error handling path Currently, preinit_net() does two things: (1) call ns_common_init() which might fail (2) initialize resources which does not fail However, preinit_net() is returning early when (1) fails, and copy_net_ns() is jumping to the dec_ucounts: label. As a result, resources allocated by net_alloc() are leaking. We need to call key_remove_domain() and net_passive_dec() in order to release resources allocated by net_alloc(). We cannot simply jump to the put_userns: label when preinit_net() failed, for (2) is not yet done. But we can reorder (1) and (2), for there is no dependency between (1) and (2). Therefore, this patch decouples (1) from preinit_net() and changes preinit_net() back to a void function, and calls ns_common_init() after preinit_net() succeeded. Then, we can jump to immediately after ns_common_free() of the put_userns: label.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 08027f6b790be1e444e4182fb4dc53faa6539d16 76c847e80d2b6be047707d58e8e05eedbe2593ad git Not specified
CNA Linux Linux affected 08027f6b790be1e444e4182fb4dc53faa6539d16 e69bde4eb566aea8fa97cbb93e0bab608964f1a5 git Not specified
CNA Linux Linux affected 08027f6b790be1e444e4182fb4dc53faa6539d16 3220b62fbb8a55feebd2a826d5ead0f49f09ed5a git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3220b62fbb8a55feebd2a826d5ead0f49f09ed5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e69bde4eb566aea8fa97cbb93e0bab608964f1a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76c847e80d2b6be047707d58e8e05eedbe2593ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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