{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26828", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.181Z", "datePublished": "2024-04-17T09:43:52.995Z", "dateUpdated": "2026-08-05T11:27:41.706Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:41.706Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix underflow in parse_server_interfaces()\n\nIn this loop, we step through the buffer and after each item we check\nif the size_left is greater than the minimum size we need. However,\nthe problem is that \"bytes_left\" is type ssize_t while sizeof() is type\nsize_t. That means that because of type promotion, the comparison is\ndone as an unsigned and if we have negative bytes left the loop\ncontinues instead of ending." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "baseScore": 9.4, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable parser consumes an SMB2 IOCTL response body received over TCP/445 from the remote SMB server, so a malicious or compromised server (or a MITM on an unsigned connection) triggers it purely with network data. No local access to the victim is required.\nAC:L - The server controls both the response length and every `Next` field, so making `bytes_left` underflow is a single deterministic value choice (e.g. buf_len=152, Next=160) with no race, timing, or memory-layout condition outside the attacker's control.\nPR:N - The attacker is the server side of the connection and needs no credentials or privileges on the victim host; it simply answers the client's own FSCTL_QUERY_NETWORK_INTERFACE_INFO request with a crafted reply.\nUI:N - Beyond the mount path, `smb2_query_server_interfaces()` re-issues the query from a self-re-arming cifsiod delayed work every 600 seconds, and `smb2_reconnect()` issues it on every tcon reconnect, so an already-mounted share is attacked with zero user action.\nS:U - The out-of-bounds read and the resulting crash are entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The loop walks arbitrary kernel memory at an attacker-chosen stride and stores the OOB bytes as interface speeds and IPv4/IPv6 addresses in `ses->iface_list`, which is printed verbatim to world-readable `/proc/fs/cifs/DebugData` and used as multichannel connect targets — an unbounded, repeatable kernel heap disclosure primitive.\nI:L - There is no out-of-bounds write, but garbage harvested from unrelated kernel heap memory is installed as the session's authoritative interface list and drives which addresses the client opens additional SMB channels to, a limited unauthorized modification of client connection state.\nA:H - With `Next` up to 4 GiB the pointer walk dereferences unmapped memory and oopses the kernel, and the loop can only exit when an OOB `Next` is zero, additionally causing unbounded `iface_list`/`iface_count` growth from a workqueue context." } ] } ], "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": "fe856be475f7cf5ffcde57341d175ce9fd09434b", "lessThan": "7190353835b4a219abb70f90b06cdcae97f11512", "status": "affected", "versionType": "git" }, { "version": "fe856be475f7cf5ffcde57341d175ce9fd09434b", "lessThan": "f7ff1c89fb6e9610d2b01c1821727729e6609308", "status": "affected", "versionType": "git" }, { "version": "fe856be475f7cf5ffcde57341d175ce9fd09434b", "lessThan": "df2af9fdbc4ddde18a3371c4ca1a86596e8be301", "status": "affected", "versionType": "git" }, { "version": "fe856be475f7cf5ffcde57341d175ce9fd09434b", "lessThan": "cffe487026be13eaf37ea28b783d9638ab147204", "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": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.79", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.18", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.6", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.18", "versionEndExcluding": "6.1.79" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.7.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7190353835b4a219abb70f90b06cdcae97f11512" }, { "url": "https://git.kernel.org/stable/c/f7ff1c89fb6e9610d2b01c1821727729e6609308" }, { "url": "https://git.kernel.org/stable/c/df2af9fdbc4ddde18a3371c4ca1a86596e8be301" }, { "url": "https://git.kernel.org/stable/c/cffe487026be13eaf37ea28b783d9638ab147204" } ], "title": "cifs: fix underflow in parse_server_interfaces()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 6.7, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-12T17:36:16.490979Z", "id": "CVE-2024-26828", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-04T18:28:47.130Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:13.603Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/7190353835b4a219abb70f90b06cdcae97f11512", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f7ff1c89fb6e9610d2b01c1821727729e6609308", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/df2af9fdbc4ddde18a3371c4ca1a86596e8be301", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/cffe487026be13eaf37ea28b783d9638ab147204", "tags": [ "x_transferred" ] } ] } ] } }