vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97993
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:27 UTC
Updated2026-10-19 10:17:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx vhost_vdpa_set_config_call() swaps the eventfd_ctx_fdget() return value into v->config_ctx before checking it, so on failure the field briefly holds an ERR_PTR: ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); swap(ctx, v->config_ctx); if (!IS_ERR_OR_NULL(ctx)) eventfd_ctx_put(ctx); if (IS_ERR(v->config_ctx)) { long ret = PTR_ERR(v->config_ctx); v->config_ctx = NULL; return ret; } Commit 0bde59c1723a ("vhost-vdpa: set v->config_ctx to NULL if eventfd_ctx_fdget() fails") added that clearing, and spelled out the invariant the rest of the file relies on: "we consider 'v->config_ctx' valid if it is not NULL". The window between the swap and the clearing still breaks it. vhost_vdpa_config_cb() only tests for NULL, so a config interrupt delivered inside the window hands the ERR_PTR to eventfd_signal(). Check the fd before installing it instead. That closes the window and matches how vhost_vring_ioctl() handles the same failure for the vq call fd. It also stops a rejected fd from tearing down a config interrupt that was working: until now the swap replaced the live context and put it, so after an EBADF the device silently stopped delivering config interrupts until userspace installed a new fd.

Risk And Classification

EPSS: 0.002100000 probability, percentile 0.102470000 (date 2026-10-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 e260dc9fbfdae0978e7a8698f977fbb463a657be git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 66e73fa18910b39fea0941dea5fe091122240855 git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 4fde085eb839fbb39c25cbba5d2a091ded394877 git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 59fc7c1c6b4d325194ca45352180340092d95098 git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 388c678639a0cebfd936b3e56c64ac6a371efec2 git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 6b20b40f020bde236f6b8a08ff88d8653261ec2b git Not specified
CNA Linux Linux affected 776f395004d829bbbf18c159ed9beb517a208c71 e74a9fa50749b9940b4fb13199652325e08d3c4a git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/59fc7c1c6b4d325194ca45352180340092d95098 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fde085eb839fbb39c25cbba5d2a091ded394877 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e74a9fa50749b9940b4fb13199652325e08d3c4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e260dc9fbfdae0978e7a8698f977fbb463a657be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66e73fa18910b39fea0941dea5fe091122240855 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b20b40f020bde236f6b8a08ff88d8653261ec2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/388c678639a0cebfd936b3e56c64ac6a371efec2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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