{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53010","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.378Z","datePublished":"2026-06-24T16:29:21.211Z","dateUpdated":"2026-08-05T12:32:37.574Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:32:37.574Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb2_open during durable reconnect\n\nIn smb2_open, the call to ksmbd_put_durable_fd(fp) drops the reference\nto the durable file descriptor early during the durable reconnect\nprocess. If an error occurs subsequently (eg, ksmbd_iov_pin_rsp fails)\nor a scavenger accesses the file, it leads to a use-after-free when\naccessing fp properties (eg fp->create_time).\n\nMove the single put to the end of the function below err_out2 so fp\nstays valid until smb2_open returns."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - ksmbd is an in-kernel SMB server reachable over TCP, and SMB2_CREATE requests are dispatched from network-received SMB packets to smb2_open. The durable reconnect path is therefore remotely reachable over the network.\nAC:L - An attacker can drive the required SMB sequence by creating a durable handle, disconnecting, and sending a durable reconnect request with controlled create contexts. The bug is a use-after-free/lifetime error in the request path, not a race depending on conditions outside the attacker's control.\nPR:N - Although SMB2_CREATE requires a valid session and tree connect, ksmbd supports guest/anonymous users and guest shares, so a reasonable guest-enabled deployment lets an unauthenticated network client satisfy those gates. Scoring uses that highest reasonable exposure.\nUI:N - No victim user action is required once ksmbd is listening and the share is available. The attacker sends SMB protocol messages directly.\nS:U - The vulnerability is in the kernel SMB server and impacts the same kernel/server security authority. It does not cross a VM, IOMMU, or other separate security scope boundary.\nC:H - The bug is a use-after-free of struct ksmbd_file, which contains kernel pointers, file state, IDs, GUIDs, and list links. Kernel UAF memory corruption can be leveraged for information disclosure, so confidentiality impact is high.\nI:H - Use-after-free in kernel heap objects can be exploited through heap shaping and stale pointer reuse to corrupt kernel state or hijack control flow. Integrity impact is therefore high.\nA:H - The stale ksmbd_file can be dereferenced or closed after free on reconnect/error/scavenger paths, which can crash or destabilize the kernel. Availability impact is high."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"],"versions":[{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"ce2e164c1c51c3f7813b80f8c926836e896bcbb3","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"97a0cd55283b4e63fd92804da91c8d9896adcad9","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"1baff47b81f94f9231c91236aa511420d0e266b9","status":"affected","versionType":"git"},{"version":"8df4bcdb0a4232192b2445256c39b787d58ef14d","status":"affected","versionType":"git"},{"version":"6.6.32","lessThan":"6.7","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.18.33","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.10","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.32"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ce2e164c1c51c3f7813b80f8c926836e896bcbb3"},{"url":"https://git.kernel.org/stable/c/97a0cd55283b4e63fd92804da91c8d9896adcad9"},{"url":"https://git.kernel.org/stable/c/1baff47b81f94f9231c91236aa511420d0e266b9"}],"title":"ksmbd: fix use-after-free in smb2_open during durable reconnect","x_generator":{"engine":"bippy-1.2.0"}}}}