196 lines
11 KiB
JSON
196 lines
11 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-2023-53597",
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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": "2025-10-04T15:40:38.479Z",
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"datePublished": "2025-10-04T15:44:09.616Z",
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"dateUpdated": "2026-08-05T09:15:00.757Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:15:00.757Z"
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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 mid leak during reconnection after timeout threshold\n\nWhen the number of responses with status of STATUS_IO_TIMEOUT\nexceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect\nthe connection. But we do not return the mid, or the credits\nreturned for the mid, or reduce the number of in-flight requests.\n\nThis bug could result in the server->in_flight count to go bad,\nand also cause a leak in the mids.\n\nThis change moves the check to a few lines below where the\nresponse is decrypted, even of the response is read from the\ntransform header. This way, the code for returning the mids\ncan be reused.\n\nAlso, the cifs_reconnect was reconnecting just the transport\nconnection before. In case of multi-channel, this may not be\nwhat we want to do after several timeouts. Changed that to\nreconnect the session and the tree too.\n\nAlso renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name\nMAX_STATUS_IO_TIMEOUT."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code is the CIFS/SMB client demultiplex thread parsing responses received from a remote SMB server over TCP; a malicious, compromised, or MITM-positioned server triggers it purely by the status field it puts in its replies. No local access to the victim is needed.\nAC:L - The server simply returns STATUS_IO_TIMEOUT to six consecutive requests, which deterministically drives the `num_io_timeout > NUM_STATUS_IO_TIMEOUT` path; there is no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:N - The attacker is the remote peer (or an on-path attacker on an unsigned connection) and holds no privileges whatsoever on the victim client system. Response status codes are attacker-chosen with no authorization gate on the client side.\nUI:N - Exploitation happens on an already-established mount by replying to requests the client issues on its own (writeback, echo, reads), and the client auto-reconnects after each reconnect cycle, so no victim action is required at exploit time.\nS:U - The leaked mids, credits, and stalled I/O are all confined to the kernel of the client host running the cifs module; no security boundary such as a VM or IOMMU domain is crossed.\nC:N - This is a reference/resource leak — an object is over-referenced and never freed. There is no out-of-bounds read, use-after-free, or uninitialized data path, so no information is disclosed to the attacker.\nI:N - No memory is corrupted and no attacker-controlled write occurs; stalled writes leave pages permanently under writeback rather than silently reporting success, so no data is modified or falsified.\nA:H - The bug is repeatable without limit, producing an unbounded kernel memory leak plus permanent `server->in_flight` inflation and credit loss that makes `wait_for_free_credits()` block indefinitely, and skipped read/write callbacks leave pages locked or under writeback forever — yielding unkillable D-state tasks, a hung/unmountable filesystem, and eventual OOM."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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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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"programFiles": [
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"fs/smb/client/connect.c"
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],
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"versions": [
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{
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"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6",
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"lessThan": "df31d05f0678cdd0796ea19983a2b93edca18bb0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6",
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"lessThan": "c55901d381a22300c9922170e59704059f50977b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6",
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"lessThan": "57d25e9905c71133e201f6d06b56a3403d4ad433",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6",
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"lessThan": "69cba9d3c1284e0838ae408830a02c4a063104bc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fa6d7a5853f93efb088aba36af12cb1944156411",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.9.5",
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"lessThan": "5.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/client/connect.c"
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],
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"versions": [
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{
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"version": "5.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.150",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.42",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.4.7",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "5.15.150"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.5"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.9.5"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/df31d05f0678cdd0796ea19983a2b93edca18bb0"
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},
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{
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"url": "https://git.kernel.org/stable/c/c55901d381a22300c9922170e59704059f50977b"
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},
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{
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"url": "https://git.kernel.org/stable/c/57d25e9905c71133e201f6d06b56a3403d4ad433"
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},
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{
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"url": "https://git.kernel.org/stable/c/69cba9d3c1284e0838ae408830a02c4a063104bc"
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}
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],
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"title": "cifs: fix mid leak during reconnection after timeout threshold",
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