CVE-2026-46243 (GCVE-0-2026-46243)
Vulnerability from cvelistv5 – Published: 2026-06-01 16:22 – Updated: 2026-06-02 03:56
VLAI
Title
smb: client: reject userspace cifs.spnego descriptions
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb: client: reject userspace cifs.spnego descriptions
cifs.spnego key descriptions contain authority-bearing fields such as
pid, uid, creduid, and upcall_target that cifs.upcall treats as
kernel-originating inputs. However, userspace can also create keys of
this type through request_key(2) or add_key(2), allowing those fields to
be supplied without CIFS origin.
Only accept cifs.spnego descriptions while CIFS is using its private
spnego_cred to request the key.
Severity
7.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 7713bd320ed4fc3d08a227cd8e41242219a16981
(git)
Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 9544559e59438a4b609b2fdfa0763d8360572824 (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < cf20038657d6d4974349556a34e08fe0490bebbc (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 2035acfb17221729b1b8ac335e941868a04ca079 (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < a3bbda6502a9398b816fa2e71c9a3f955f58013d (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 91f89c1d83e80417629791fcef6af8140d7d01c8 (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 0aece6685fc80a8de492688ca2315fb86ec379c7 (git) Affected: f1d662a7d5e5322e583aad6b3cfec03d8f27b435 , < 3da1fdf4efbc490041eb4f836bf596201203f8f2 (git) |
|
| Linux | Linux |
Affected:
2.6.24
Unaffected: 0 , < 2.6.24 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1-rc5 , ≤ * (original_commit_for_fix) |
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{\"status\": \"unaffected\", \"version\": \"6.12.92\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1-rc5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/client/cifs_spnego.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981\"}, {\"url\": \"https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824\"}, {\"url\": \"https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc\"}, {\"url\": \"https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079\"}, {\"url\": \"https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d\"}, {\"url\": \"https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8\"}, {\"url\": \"https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7\"}, {\"url\": \"https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: reject userspace cifs.spnego descriptions\\n\\ncifs.spnego key descriptions contain authority-bearing fields such as\\npid, uid, creduid, and upcall_target that cifs.upcall treats as\\nkernel-originating inputs. However, userspace can also create keys of\\nthis type through request_key(2) or add_key(2), allowing those fields to\\nbe supplied without CIFS origin.\\n\\nOnly accept cifs.spnego descriptions while CIFS is using its private\\nspnego_cred to request the key.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.142\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.92\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.34\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.11\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1-rc5\", \"versionStartIncluding\": \"2.6.24\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-06-01T16:22:29.211Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-46243\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-02T03:56:00.563Z\", \"dateReserved\": \"2026-05-13T15:03:33.107Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-01T16:22:29.211Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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