CVE-2026-97993
UnknownSummary
In the Linux kernel, the vhost-vdpa module has a bug where the eventfd_ctx_fdget() error is installed 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. vhost_vdpa_config_cb() only tests for NULL, so a config interrupt delivered inside that window hands the ERR_PTR to eventfd_signal(). Additionally, a rejected fd can tear down a working config interrupt.
Risk Assessment
Can lead to a kernel crash or malfunction of vhost-vdpa device config interrupts. Requires access to /dev/vhost-vdpa-*.
Recommendation
Update the Linux kernel to a version containing the fix that checks the fd before installing it. Restrict access to /dev/vhost-vdpa-* for untrusted users.
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Original NVD description (English source)
In 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS