fuse-uring: fix EFAULT clobber in fuse_uring_commit

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64264
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:06 UTC
Updated2026-07-30 15:00:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fuse-uring: fix EFAULT clobber in fuse_uring_commit copy_from_user() returns the number of bytes not copied as an unsigned residual on failure (1..sizeof(struct fuse_out_header)). fuse_uring_commit stores that residual in ssize_t err, sets req->out.h.error to -EFAULT, then jumps to out: with err still holding the positive residual. err = copy_from_user(&req->out.h, &ent->headers->in_out, sizeof(req->out.h)); if (err) { req->out.h.error = -EFAULT; goto out; /* err is the positive residual */ } ... out: fuse_uring_req_end(ent, req, err); fuse_uring_req_end() then runs if (error) req->out.h.error = error; which overwrites the just-assigned -EFAULT with the positive residual. FUSE callers such as fuse_simple_request() test err < 0 to detect failure, so the positive value is interpreted as success and the caller proceeds with an uninitialised or partial req->out.args. Fix by assigning err = -EFAULT in the failure branch before jumping to out, so fuse_uring_req_end() receives a negative errno and sets req->out.h.error to -EFAULT.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098420000 (date 2026-08-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c090c8abae4b6b77a1bee116aa6c385456ebef96 0483fffdeeb363f320e6bf5fc0f0306007507306 git Not specified
CNA Linux Linux affected c090c8abae4b6b77a1bee116aa6c385456ebef96 fe604c08d874648a69187f6380e5c7858627dc04 git Not specified
CNA Linux Linux affected c090c8abae4b6b77a1bee116aa6c385456ebef96 3a0a8bc51a13951c5141262bf770eeea3e0b6228 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 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/fe604c08d874648a69187f6380e5c7858627dc04 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a0a8bc51a13951c5141262bf770eeea3e0b6228 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0483fffdeeb363f320e6bf5fc0f0306007507306 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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