CVE-2026-23346 (GCVE-0-2026-23346)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-06-19 11:57
VLAI
EPSS
VEX
Title
arm64: io: Extract user memory type in ioremap_prot()
Summary
In the Linux kernel, the following vulnerability has been resolved:
arm64: io: Extract user memory type in ioremap_prot()
The only caller of ioremap_prot() outside of the generic ioremap()
implementation is generic_access_phys(), which passes a 'pgprot_t' value
determined from the user mapping of the target 'pfn' being accessed by
the kernel. On arm64, the 'pgprot_t' contains all of the non-address
bits from the pte, including the permission controls, and so we end up
returning a new user mapping from ioremap_prot() which faults when
accessed from the kernel on systems with PAN:
| Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000
| ...
| Call trace:
| __memcpy_fromio+0x80/0xf8
| generic_access_phys+0x20c/0x2b8
| __access_remote_vm+0x46c/0x5b8
| access_remote_vm+0x18/0x30
| environ_read+0x238/0x3e8
| vfs_read+0xe4/0x2b0
| ksys_read+0xcc/0x178
| __arm64_sys_read+0x4c/0x68
Extract only the memory type from the user 'pgprot_t' in ioremap_prot()
and assert that we're being passed a user mapping, to protect us against
any changes in future that may require additional handling. To avoid
falsely flagging users of ioremap(), provide our own ioremap() macro
which simply wraps __ioremap_prot().
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 64858b76ec67c5fc40fef8ec1841fecb78c1ebde
(git)
Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < eeecafce5afffb4da703666ebefbd4d6e2a5abf6 (git) Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 3d64dcc0799c2d6921ba027716b7be721eb19fa8 (git) Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a (git) Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 8f098037139b294050053123ab2bc0f819d08932 (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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}
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"dateUpdated": "2026-06-19T11:57:35.219Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
"url": "https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6"
},
{
"url": "https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8"
},
{
"url": "https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"
},
{
"url": "https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932"
}
],
"title": "arm64: io: Extract user memory type in ioremap_prot()",
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"cveId": "CVE-2026-23346",
"datePublished": "2026-03-25T10:27:33.133Z",
"dateReserved": "2026-01-13T15:37:45.999Z",
"dateUpdated": "2026-06-19T11:57:35.219Z",
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"date": "2026-09-16",
"epss": "0.00127",
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"microsoft_vex": {
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"id": "msrc_CVE-2026-23346",
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"product_status:fixed": "1",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "arm64: io: Extract user memory type in ioremap_prot()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-23346.json",
"version": "10"
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-23346\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:32.767\",\"lastModified\":\"2026-06-19T13:16:25.463\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: io: Extract user memory type in ioremap_prot()\\n\\nThe only caller of ioremap_prot() outside of the generic ioremap()\\nimplementation is generic_access_phys(), which passes a \u0027pgprot_t\u0027 value\\ndetermined from the user mapping of the target \u0027pfn\u0027 being accessed by\\nthe kernel. On arm64, the \u0027pgprot_t\u0027 contains all of the non-address\\nbits from the pte, including the permission controls, and so we end up\\nreturning a new user mapping from ioremap_prot() which faults when\\naccessed from the kernel on systems with PAN:\\n\\n | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000\\n | ...\\n | Call trace:\\n | __memcpy_fromio+0x80/0xf8\\n | generic_access_phys+0x20c/0x2b8\\n | __access_remote_vm+0x46c/0x5b8\\n | access_remote_vm+0x18/0x30\\n | environ_read+0x238/0x3e8\\n | vfs_read+0xe4/0x2b0\\n | ksys_read+0xcc/0x178\\n | __arm64_sys_read+0x4c/0x68\\n\\nExtract only the memory type from the user \u0027pgprot_t\u0027 in ioremap_prot()\\nand assert that we\u0027re being passed a user mapping, to protect us against\\nany changes in future that may require additional handling. To avoid\\nfalsely flagging users of ioremap(), provide our own ioremap() macro\\nwhich simply wraps __ioremap_prot().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\narm64: io: Extraer el tipo de memoria de usuario en ioremap_prot()\\n\\nEl \u00fanico llamador de ioremap_prot() fuera de la implementaci\u00f3n gen\u00e9rica de ioremap() es generic_access_phys(), que pasa un valor \u0027pgprot_t\u0027 determinado a partir del mapeo de usuario del \u0027pfn\u0027 objetivo al que accede el kernel. En arm64, el \u0027pgprot_t\u0027 contiene todos los bits no relacionados con la direcci\u00f3n del pte, incluidos los controles de permiso, y as\u00ed terminamos devolviendo un nuevo mapeo de usuario desde ioremap_prot() que falla cuando se accede desde el kernel en sistemas con PAN:\\n\\n | No se puede manejar la lectura del kernel desde memoria ilegible en la direcci\u00f3n virtual ffff80008ea89000\\n | ...\\n | Rastro de llamada:\\n | __memcpy_fromio+0x80/0xf8\\n | generic_access_phys+0x20c/0x2b8\\n | __access_remote_vm+0x46c/0x5b8\\n | access_remote_vm+0x18/0x30\\n | environ_read+0x238/0x3e8\\n | vfs_read+0xe4/0x2b0\\n | ksys_read+0xcc/0x178\\n | __arm64_sys_read+0x4c/0x68\\n\\nExtraer solo el tipo de memoria del \u0027pgprot_t\u0027 de usuario en ioremap_prot() y afirmar que se nos est\u00e1 pasando un mapeo de usuario, para protegernos contra cualquier cambio futuro que pueda requerir manejo adicional. Para evitar marcar err\u00f3neamente a los usuarios de ioremap(), proporcionar nuestra propia macro ioremap() que simplemente envuelve a __ioremap_prot().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm64/include/asm/io.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"893dea9ccd08dab924839354aba21d4ed7a9abc0\",\"lessThan\":\"64858b76ec67c5fc40fef8ec1841fecb78c1ebde\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893dea9ccd08dab924839354aba21d4ed7a9abc0\",\"lessThan\":\"eeecafce5afffb4da703666ebefbd4d6e2a5abf6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893dea9ccd08dab924839354aba21d4ed7a9abc0\",\"lessThan\":\"3d64dcc0799c2d6921ba027716b7be721eb19fa8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893dea9ccd08dab924839354aba21d4ed7a9abc0\",\"lessThan\":\"d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893dea9ccd08dab924839354aba21d4ed7a9abc0\",\"lessThan\":\"8f098037139b294050053123ab2bc0f819d08932\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm64/include/asm/io.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.17\",\"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\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"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\":\"6.0.1\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"1E4E7304-41DC-42ED-AFC0-8B1962A7CF99\"},{\"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:6.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"7BE551E5-89CF-47A8-9B26-03CE727FBA37\"},{\"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\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a\",\"sour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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T10:58:44+00:00",
"cve": "CVE-2026-23346",
"id": "CVE-2026-23346",
"initial_release_date": "2026-03-25T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: arm64: io: Extract user memory type in ioremap_prot()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23346.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:37:02Z",
"cve": "CVE-2026-23346",
"id": "CVE-2026-23346",
"initial_release_date": "2026-03-25T16:55:53Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "449",
"product_status:known_not_affected": "312",
"product_status:recommended": "280",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-23346",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23346.json",
"version": "22"
}
}
}
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|---|
Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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