CVE-2026-23364 (GCVE-0-2026-23364)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-08-05 12:21
VLAI
EPSS
VEX
Title
ksmbd: Compare MACs in constant time
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
Severity
7.4 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 8a665d733940592e671ec6afadcd0be80a091a80
(git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < cd52a0e309659537048a864211abc3ea4c5caa63 (git) Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 307afccb751f542246bd5dc68a2c1ffe1a78418c (git) Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 2cdc56ed67615ba0921383a688f24415ebe065f3 (git) Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 93c0a22fec914ec4b697e464895a0f594e29fb28 (git) Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < f4588b85efd6007d46b80aa1b9fb746628ffb3dc (git) Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < c5794709bc9105935dbedef8b9cf9c06f2b559fa (git) |
guessed | |
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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{
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"programFiles": [
"fs/smb/server/Kconfig",
"fs/smb/server/auth.c",
"fs/smb/server/smb2pdu.c"
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{
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},
{
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{
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"version": "6.19.7",
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},
{
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"version": "7.0",
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}
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}
],
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Compare MACs in constant time\n\nTo prevent timing attacks, MAC comparisons need to be constant-time.\nReplace the memcmp() with the correct function, crypto_memneq()."
}
],
"metrics": [
{
"cvssV3_1": {
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP port 445, directly reachable by any network attacker.\nAC:H - This is a timing side-channel attack requiring many network requests to statistically distinguish memcmp() early-return timing differences; network jitter is beyond the attacker\u0027s control and adds noise that significantly increases exploitation difficulty.\nPR:N - The most critical vulnerable comparison (NTLMv2 MAC in ksmbd_auth_ntlmv2) is reached during the SMB session setup authentication handshake, before any credentials are verified \u2014 no prior privileges are needed.\nUI:N - The attacker directly sends SMB authentication requests to the ksmbd server; no victim user action is required.\nS:U - The vulnerability and its impact remain within the ksmbd/kernel security authority; no security boundary is crossed.\nC:H - Successful timing attack on the NTLMv2 MAC comparison enables authentication bypass, granting the attacker full read access to all SMB-shared files and data.\nI:H - Authentication bypass via forged NTLMv2 response grants write access to SMB shares, allowing arbitrary modification of shared data.\nA:N - The timing side-channel itself causes no crashes, hangs, or denial of service; it only leaks timing information about MAC correctness."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:21:17.856Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80"
},
{
"url": "https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63"
},
{
"url": "https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c"
},
{
"url": "https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3"
},
{
"url": "https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28"
},
{
"url": "https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc"
},
{
"url": "https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa"
}
],
"title": "ksmbd: Compare MACs in constant time",
"x_generator": {
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}
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-23364",
"datePublished": "2026-03-25T10:27:46.960Z",
"dateReserved": "2026-01-13T15:37:46.002Z",
"dateUpdated": "2026-08-05T12:21:17.856Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-23364",
"date": "2026-09-16",
"epss": "0.00392",
"percentile": "0.32895"
},
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crypto_memneq().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/Kconfig\",\"fs/smb/server/auth.c\",\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"8a665d733940592e671ec6afadcd0be80a091a80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"cd52a0e309659537048a864211abc3ea4c5caa63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"307afccb751f542246bd5dc68a2c1ffe1a78418c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"2cdc56ed67615ba0921383a688f24415ebe065f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"93c0a22fec914ec4b697e464895a0f594e29fb28\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"f4588b85efd6007d46b80aa1b9fb746628ffb3dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9\",\"lessThan\":\"c5794709bc9105935dbedef8b9cf9c06f2b559fa\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/Kconfig\",\"fs/smb/server/auth.c\",\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.167\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.78\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.19\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.7\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.1\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"188E5185-CE12-4815-A91F-88B7BAE67583\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"C57BB918-DF28-46B3-94F7-144176841267\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.78\",\"matchCriteriaId\":\"28D591F5-B196-4CC9-905C-DC80F116E7A8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.19\",\"matchCriteriaId\":\"D394AC60-6F28-435F-872A-CCDF384B8331\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"40D9C0D1-0F32-4A2B-9840-1072F5497540\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64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"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T07:20:30+00:00",
"cve": "CVE-2026-23364",
"id": "CVE-2026-23364",
"initial_release_date": "2026-03-25T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ksmbd: Compare MACs in constant time",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23364.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-06T01:26:13Z",
"cve": "CVE-2026-23364",
"id": "CVE-2026-23364",
"initial_release_date": "2026-03-25T16:55:29Z",
"product_status:known_not_affected": "334",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-23364",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23364.json",
"version": "8"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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