nvmet-tcp: fix page fragment cache leak in error path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74386
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:40 UTC
Updated2026-08-15 06:22:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fix page fragment cache leak in error path In nvmet_tcp_alloc_queue(), when a connection is closed during the allocation process (e.g., nvmet_tcp_set_queue_sock() returns -ENOTCONN), the error handling jumps to out_destroy_sq and then to out_ida_remove without draining the page fragment cache. Although nvmet_tcp_free_cmd() is called in some error paths to release individual page fragments, the underlying page cache reference held by queue->pf_cache is never released. The first allocation using pf_cache is the call to nvmet_tcp_alloc_cmd() for queue->connect, which happens after ida_alloc() returns successfully. This results in a page leak each time a connection fails during allocation, which could lead to memory exhaustion over time if connections are repeatedly opened and closed. Fix this by calling page_frag_cache_drain() before freeing the queue structure in the out_ida_remove label.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 872d26a391da92ed8f0c0f5cb5fef428067b7f30 a43a9abc1ebf663f0aa56a729106f68dd9c77da6 git Not specified
CNA Linux Linux affected 872d26a391da92ed8f0c0f5cb5fef428067b7f30 ba3209704b3cd46961e4e081af5c52a780785648 git Not specified
CNA Linux Linux affected 872d26a391da92ed8f0c0f5cb5fef428067b7f30 5fbe83a374f09561a0f0c1f4aa021501ffd681eb git Not specified
CNA Linux Linux affected 872d26a391da92ed8f0c0f5cb5fef428067b7f30 4dae393956093c807212918fd91a8fc70df15338 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a43a9abc1ebf663f0aa56a729106f68dd9c77da6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5fbe83a374f09561a0f0c1f4aa021501ffd681eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba3209704b3cd46961e4e081af5c52a780785648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4dae393956093c807212918fd91a8fc70df15338 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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