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Title
Linux kernel本地权限提升漏洞（CNVD-2026-19044）
Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。
Linux kernel存在本地权限提升漏洞，该漏洞源于crypto: algif_aead模块在处理AEAD操作时的逻辑缺陷，攻击者可利用该漏洞通过AF_ALG加密接口向任意可读文件的页缓存（page cache）写入受控的少量数据（PoC中为4字节块），进而篡改setuid等特权二进制文件，实现本地权限提升至root。
Severity
高
Patch Name
Linux kernel本地权限提升漏洞（CNVD-2026-19044）的补丁
Patch Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。
Linux kernel存在本地权限提升漏洞，该漏洞源于crypto: algif_aead模块在处理AEAD操作时的逻辑缺陷，攻击者可利用该漏洞通过AF_ALG加密接口向任意可读文件的页缓存（page cache）写入受控的少量数据（PoC中为4字节块），进而篡改setuid等特权二进制文件，实现本地权限提升至root。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description
厂商已发布了漏洞修复程序，请及时关注更新： https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
Reference
https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
Impacted products
| Name | Linux Linux kernel >=commit72548b093ee3，<commit a664bf3d603d |
|---|
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"cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-31431"
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CVE-2026-31431 (GCVE-0-2026-31431)
Vulnerability from cvelistv5 – Published: 2026-04-22 08:15 – Updated: 2026-05-18 17:44
VLAI
EPSS
Title
crypto: algif_aead - Revert to operating out-of-place
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: algif_aead - Revert to operating out-of-place
This mostly reverts commit 72548b093ee3 except for the copying of
the associated data.
There is no benefit in operating in-place in algif_aead since the
source and destination come from different mappings. Get rid of
all the complexity added for in-place operation and just copy the
AD directly.
Severity
7.8 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-669 - Incorrect Resource Transfer Between Spheres
Assigner
References
86 references
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < 893d22e0135fa394db81df88697fba6032747667
(git)
Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < 19d43105a97be0810edbda875f2cd03f30dc130c (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < 961cfa271a918ad4ae452420e7c303149002875b (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < 3115af9644c342b356f3f07a4dd1c8905cd9a6fc (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < 8b88d99341f139e23bdeb1027a2a3ae10d341d82 (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < ce42ee423e58dffa5ec03524054c9d8bfd4f6237 (git) Affected: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 , < a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 (git) |
|
| Linux | Linux |
Affected:
4.14
Unaffected: 0 , < 4.14 (semver) Unaffected: 5.10.254 , ≤ 5.10.* (semver) Unaffected: 5.15.204 , ≤ 5.15.* (semver) Unaffected: 6.1.170 , ≤ 6.1.* (semver) Unaffected: 6.6.137 , ≤ 6.6.* (semver) Unaffected: 6.12.85 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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{
"lessThan": "19d43105a97be0810edbda875f2cd03f30dc130c",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
},
{
"lessThan": "961cfa271a918ad4ae452420e7c303149002875b",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
},
{
"lessThan": "3115af9644c342b356f3f07a4dd1c8905cd9a6fc",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
},
{
"lessThan": "8b88d99341f139e23bdeb1027a2a3ae10d341d82",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
},
{
"lessThan": "fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
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},
{
"lessThan": "ce42ee423e58dffa5ec03524054c9d8bfd4f6237",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
},
{
"lessThan": "a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5",
"status": "affected",
"version": "72548b093ee38a6d4f2a19e6ef1948ae05c181f7",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"crypto/af_alg.c",
"crypto/algif_aead.c",
"crypto/algif_skcipher.c",
"include/crypto/if_alg.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
},
{
"lessThan": "4.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.254",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.204",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.170",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.137",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.85",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.254",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.204",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.170",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.137",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.85",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.22",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.12",
"versionStartIncluding": "4.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "4.14",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings. Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T22:08:34.612Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667"
},
{
"url": "https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c"
},
{
"url": "https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b"
},
{
"url": "https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc"
},
{
"url": "https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82"
},
{
"url": "https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8"
},
{
"url": "https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237"
},
{
"url": "https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5"
}
],
"title": "crypto: algif_aead - Revert to operating out-of-place",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31431",
"datePublished": "2026-04-22T08:15:10.123Z",
"dateReserved": "2026-03-09T15:48:24.089Z",
"dateUpdated": "2026-05-18T17:44:54.264Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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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