{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35862", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.107Z", "datePublished": "2024-05-19T08:34:21.173Z", "dateUpdated": "2026-08-05T11:30:26.161Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:26.161Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF in smb2_is_network_name_deleted()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF." } ], "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 - The vulnerable function is invoked by the CIFS demultiplex thread on every SMB2 response received over TCP/445, keyed entirely on server-supplied fields (`Status` and `Id.SyncId.TreeId`). A malicious SMB server, or an off-path/MITM attacker injecting into an unsigned SMB connection, triggers it purely with network data.\nAC:L - The remote peer controls both sides of the race: it forces the session teardown (failed reconnect/session setup drives `__cifs_put_smb_ses()`), and it holds the SES_EXITING window open for the full request timeout simply by not answering the SMB2 LOGOFF, while flooding STATUS_NETWORK_NAME_DELETED responses. The attempt is freely repeatable with no attacker-uncontrollable precondition.\nPR:N - The attacker is the remote SMB peer and needs no credentials or privileges on the target Linux client; the code path runs in the kernel demux thread before any signature validation of the response.\nUI:N - The attack works against an already-established mount — an fstab/autofs/systemd-automount or DFS-referral connection, or a file server compromised or MITM'd after mount — and the server itself induces the session teardown, so no victim action is required.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on `cifs_tcon`/`cifs_ses` gives an attacker-influenced read of freed slab contents, and `pr_warn_once(\"%s\", tcon->tree_name)` walks freed heap memory into the kernel log, leaking whatever now occupies that object.\nI:H - The path writes into freed memory — `spin_lock(&tcon->tc_lock)` plus `tcon->need_reconnect = true` — on an object the remote attacker selects via the controlled TreeId, giving a heap-spray-able corruption primitive leveragable for control-flow hijack.\nA:H - Dereferencing the poisoned/freed session and tcon produces a general protection fault or KASAN oops in the cifsd kernel thread (as shown in the sibling fix's trace), crashing or hanging the client with the mount unusable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2ops.c" ], "versions": [ { "version": "9e550b085206544bd03a8b1dd58a5414e9508351", "lessThan": "f9414004798d9742c1af23a1d839fe6a9503751c", "status": "affected", "versionType": "git" }, { "version": "9e550b085206544bd03a8b1dd58a5414e9508351", "lessThan": "aa582b33f94453fdeaff1e7d0aa252c505975e01", "status": "affected", "versionType": "git" }, { "version": "9e550b085206544bd03a8b1dd58a5414e9508351", "lessThan": "d919b6ea15ffa56fbafef4a1d92f47aeda9af645", "status": "affected", "versionType": "git" }, { "version": "9e550b085206544bd03a8b1dd58a5414e9508351", "lessThan": "63981561ffd2d4987807df4126f96a11e18b0c1d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2ops.c" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.12", "versionEndExcluding": "6.1.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f9414004798d9742c1af23a1d839fe6a9503751c" }, { "url": "https://git.kernel.org/stable/c/aa582b33f94453fdeaff1e7d0aa252c505975e01" }, { "url": "https://git.kernel.org/stable/c/d919b6ea15ffa56fbafef4a1d92f47aeda9af645" }, { "url": "https://git.kernel.org/stable/c/63981561ffd2d4987807df4126f96a11e18b0c1d" } ], "title": "smb: client: fix potential UAF in smb2_is_network_name_deleted()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.581Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/f9414004798d9742c1af23a1d839fe6a9503751c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/aa582b33f94453fdeaff1e7d0aa252c505975e01", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d919b6ea15ffa56fbafef4a1d92f47aeda9af645", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/63981561ffd2d4987807df4126f96a11e18b0c1d", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35862", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:41:27.598442Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:17.367Z" } } ] } }