{"id":"CVE-2023-53358","state":"PUBLISHED","title":"ksmbd: fix racy issue under cocurrent smb2 tree disconnect","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue under cocurrent smb2 tree disconnect\n\nThere is UAF issue under cocurrent smb2 tree disconnect.\nThis patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent\naccess.","publishedAt":"2025-09-17T14:56:48.812Z","updatedAt":"2026-08-05T09:13:38.694Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"b36295c17fb97424406f0c3ab321b1ccaabb9be8","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"dc1c17716c099c90948ebb83e2170dd75a3be6b6","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"39366b47a59d46af15ac57beb0996268bf911f6a","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"30210947a343b6b3ca13adc9bfc88e1543e16dd5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ksmbd/mgmt/tree_connect.c","fs/ksmbd/mgmt/tree_connect.h","fs/ksmbd/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.145","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.28","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.15","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3.2","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ksmbd/mgmt/tree_connect.c","fs/ksmbd/mgmt/tree_connect.h","fs/ksmbd/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/b36295c17fb97424406f0c3ab321b1ccaabb9be8","https://git.kernel.org/stable/c/bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6","https://git.kernel.org/stable/c/dc1c17716c099c90948ebb83e2170dd75a3be6b6","https://git.kernel.org/stable/c/39366b47a59d46af15ac57beb0996268bf911f6a","https://git.kernel.org/stable/c/30210947a343b6b3ca13adc9bfc88e1543e16dd5"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53358.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53358","state":"PUBLISHED","datePublished":"2025-09-17T14:56:48.812Z","dateUpdated":"2026-08-05T09:13:38.694Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-17T14:54:09.732Z"},"containers":{"cna":{"title":"ksmbd: fix racy issue under cocurrent smb2 tree disconnect","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue under cocurrent smb2 tree disconnect\n\nThere is UAF issue under cocurrent smb2 tree disconnect.\nThis patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent\naccess."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"b36295c17fb97424406f0c3ab321b1ccaabb9be8","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"dc1c17716c099c90948ebb83e2170dd75a3be6b6","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"39366b47a59d46af15ac57beb0996268bf911f6a","versionType":"git"},{"version":"0626e6641f6b467447c81dd7678a69c66f7746cf","status":"affected","lessThan":"30210947a343b6b3ca13adc9bfc88e1543e16dd5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ksmbd/mgmt/tree_connect.c","fs/ksmbd/mgmt/tree_connect.h","fs/ksmbd/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.145","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.28","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.15","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3.2","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ksmbd/mgmt/tree_connect.c","fs/ksmbd/mgmt/tree_connect.h","fs/ksmbd/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b36295c17fb97424406f0c3ab321b1ccaabb9be8"},{"url":"https://git.kernel.org/stable/c/bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6"},{"url":"https://git.kernel.org/stable/c/dc1c17716c099c90948ebb83e2170dd75a3be6b6"},{"url":"https://git.kernel.org/stable/c/39366b47a59d46af15ac57beb0996268bf911f6a"},{"url":"https://git.kernel.org/stable/c/30210947a343b6b3ca13adc9bfc88e1543e16dd5"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - ksmbd is the in-kernel SMB server reached over TCP/445; smb2_tree_disconnect() is invoked from handle_ksmbd_work() solely on SMB2_TREE_DISCONNECT PDUs from a remote peer, with no local access required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2_TREE_DISCONNECT requests for the same TreeId (parallel ksmbd-io workqueue items via SMB credits) and can retry indefinitely until both paths observe the same tcon before TREE_CONN_EXPIRE exists.\nPR:L - smb2_check_user_session() and smb2_get_ksmbd_tcon() gate TREE_DISCONNECT behind an established session and tree connect, so a low-privileged SMB share user (including guest where mapped) is required; this is post-authentication, not a pre-auth path.\nUI:N - The attacker performs negotiate, session setup, tree connect, and concurrent tree disconnects entirely on its own connections; no victim or administrator action is needed.\nS:U - The use-after-free corrupts ksmbd kernel heap state within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Concurrent disconnect double-frees struct ksmbd_tree_connect (share_conf/user pointers), a sprayable slab UAF that yields arbitrary kernel read primitives once the object is reclaimed, consistent with ZDI-CAN-20592 RCE classification.\nI:H - The second disconnect path reads tree_conn fields from freed memory then kfree()s again, enabling heap spray to hijack control flow / arbitrary write; ZDI rates this as remote code execution in kernel context.\nA:H - Even without full exploitation, the double-free/UAF reliably oopses or panics ksmbd worker threads and can be triggered repeatedly over the network to deny service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T09:13:38.694Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.2.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.3.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2023-53358","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T18:43:24.919171Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T18:52:59.942Z"}}]}}}