296 lines
15 KiB
JSON
296 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-26828",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.181Z",
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"datePublished": "2024-04-17T09:43:52.995Z",
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"dateUpdated": "2026-10-30T12:17:52.665Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:17:52.665Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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"metrics": [
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"version": "3.1",
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"baseScore": 9.4,
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},
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/smb/client/smb2ops.c"
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"version": "0",
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"version": "6.7.6",
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"lessThanOrEqual": "6.7.*",
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"status": "unaffected",
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"version": "6.8",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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