io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64426
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:26 UTC
Updated2026-07-25 10:17:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE NOP file-acquisition support choses between a fixed (registered) file and a normal fget()'d file based on its own IORING_NOP_FIXED_FILE flag in sqe->nop_flags. However, a request's REQ_F_FIXED_FILE is set independently from the generic IOSQE_FIXED_FILE sqe flag during request init, before the issue handler runs. If a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is set) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path and grabs a real reference via io_file_get_normal(). On completion, io_put_file() only drops the reference when REQ_F_FIXED_FILE is clear, so the fget()'d file is never released and leaks: BUG: memory leak unreferenced object 0xffff88800f42c240 (size 176): kmem_cache_alloc_noprof+0x358/0x440 alloc_empty_file+0x57/0x180 path_openat+0x44/0x1e50 do_file_open+0x121/0x200 do_sys_openat2+0xa7/0x150 __x64_sys_openat+0x82/0xf0 Decide between fixed and normal file acquisition from REQ_F_FIXED_FILE, the same way io_assign_file() does for every other opcode, and fold IORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a85f31052bce52111b4e9d5a536003481d0421d0 722869fcff598fad20d5ab79c305897a7534708b git Not specified
CNA Linux Linux affected a85f31052bce52111b4e9d5a536003481d0421d0 7267717f35787167fcce4bc14f6ef3fa06682dcf git Not specified
CNA Linux Linux affected a85f31052bce52111b4e9d5a536003481d0421d0 2564ca2e31bd8ee8348362941af2ee4671e487ca git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 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/722869fcff598fad20d5ab79c305897a7534708b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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