{"id":"CVE-2026-97993","revision":"92a5c05423e14838ac533e67bbe96614","records":[{"revision":"92a5c05423e14838ac533e67bbe96614","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97993","aliases":[],"title":"vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx\n\nvhost_vdpa_set_config_call() swaps the eventfd_ctx_fdget() return value\ninto v->config_ctx before checking it, so on failure the field briefly\nholds an ERR_PTR:\n\n\tctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);\n\tswap(ctx, v->config_ctx);\n\n\tif (!IS_ERR_OR_NULL(ctx))\n\t\teventfd_ctx_put(ctx);\n\n\tif (IS_ERR(v->config_ctx)) {\n\t\tlong ret = PTR_ERR(v->config_ctx);\n\n\t\tv->config_ctx = NULL;\n\t\treturn ret;\n\t}\n\nCommit 0bde59c1723a (\"vhost-vdpa: set v->config_ctx to NULL if\neventfd_ctx_fdget() fails\") added that clearing, and spelled out the\ninvariant the rest of the file relies on: \"we consider 'v->config_ctx'\nvalid if it is not NULL\".  The window between the swap and the clearing\nstill breaks it.  vhost_vdpa_config_cb() only tests for NULL, so a config\ninterrupt delivered inside the window hands the ERR_PTR to\neventfd_signal().\n\nCheck the fd before installing it instead.  That closes the window and\nmatches how vhost_vring_ioctl() handles the same failure for the vq call\nfd.\n\nIt also stops a rejected fd from tearing down a config interrupt that was\nworking: until now the swap replaced the live context and put it, so\nafter an EBADF the device silently stopped delivering config interrupts\nuntil userspace installed a new fd.","state":0,"publishedAt":"2026-09-25T10:23:25.11+00:00","modifiedAt":"2026-10-19T09:12:00.172+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vhost/vdpa.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"e260dc9fbfdae0978e7a8698f977fbb463a657be\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"66e73fa18910b39fea0941dea5fe091122240855\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"4fde085eb839fbb39c25cbba5d2a091ded394877\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"59fc7c1c6b4d325194ca45352180340092d95098\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"388c678639a0cebfd936b3e56c64ac6a371efec2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"6b20b40f020bde236f6b8a08ff88d8653261ec2b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"776f395004d829bbbf18c159ed9beb517a208c71\",\n                            \"lessThan\": \"e74a9fa50749b9940b4fb13199652325e08d3c4a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vhost/vdpa.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e260dc9fbfdae0978e7a8698f977fbb463a657be","https://git.kernel.org/stable/c/66e73fa18910b39fea0941dea5fe091122240855","https://git.kernel.org/stable/c/4fde085eb839fbb39c25cbba5d2a091ded394877","https://git.kernel.org/stable/c/59fc7c1c6b4d325194ca45352180340092d95098","https://git.kernel.org/stable/c/388c678639a0cebfd936b3e56c64ac6a371efec2","https://git.kernel.org/stable/c/65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a","https://git.kernel.org/stable/c/6b20b40f020bde236f6b8a08ff88d8653261ec2b","https://git.kernel.org/stable/c/e74a9fa50749b9940b4fb13199652325e08d3c4a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97993","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97993","identifiers":["CVE-2026-97993"]},"retained":false,"historicalAffected":[]}],"coverage":[]}