CVE-2025-38212

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If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached only through a local write to the /proc/sys/kernel/shm_rmid_forced sysctl plus SysV shmget() syscalls; there is no remote or network-facing entry point into shm_destroy_orphaned().\nAC:L - The attacker controls both sides of the window \u2014 the number of orphaned segments (making the unprotected idr_for_each() walk long and forcing it to sleep in shmem_lock()/fput()/cond_resched(), which is a quiescent state that lets the call_rcu() node free complete) and the concurrent slab spray that reoccupies the freed radix_tree_node; syzbot reproduced it, so no condition lies outside attacker influence.\nPR:L - The shm_rmid_forced sysctl is mode 0644 owned by make_kuid(ns->user_ns, 0), so an unprivileged user who does unshare(CLONE_NEWUSER|CLONE_NEWIPC) becomes the owner and can write it in their own IPC namespace; no real root or capability in the init namespace is needed.\nUI:N - The attacker performs every step itself (namespace creation, shmget/fork/exit, sysctl write); no victim action or cooperation is involved.\nS:U - The use-after-free corrupts kernel slab memory and is exploited within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed radix_tree_node is read after reuse and its slot contents are propagated as a kernel pointer that is dereferenced, and since the node cache is shared with page-cache xa_nodes the attacker can leverage the stale reads to disclose arbitrary kernel memory and defeat KASLR.\nI:H - The stale slot value is container_of()'d into a shmid_kernel and then written through \u2014 spin_lock() on shm_perm.lock, shp->shm_file = NULL, refcount decrement and fput() on an attacker-influenced pointer \u2014 giving type confusion with write and arbitrary-free primitives suitable for privilege escalation.\nA:H - The slab-use-after-free read of a freed radix_tree_node reliably produces a KASAN splat, oops, or panic from wild-pointer dereference in the ipc teardown path, crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["ipc/shm.c"], "versions": [{"version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": 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"versionType": "semver"}, {"version": "6.12.35", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.4.295"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.10.239"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.186"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", 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"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": 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there is no remote or network-facing entry point into shm_destroy_orphaned().\nAC:L - The attacker controls both sides of the window \u2014 the number of orphaned segments (making the unprotected idr_for_each() walk long and forcing it to sleep in shmem_lock()/fput()/cond_resched(), which is a quiescent state that lets the call_rcu() node free complete) and the concurrent slab spray that reoccupies the freed radix_tree_node; syzbot reproduced it, so no condition lies outside attacker influence.\nPR:L - The shm_rmid_forced sysctl is mode 0644 owned by make_kuid(ns->user_ns, 0), so an unprivileged user who does unshare(CLONE_NEWUSER|CLONE_NEWIPC) becomes the owner and can write it in their own IPC namespace; no real root or capability in the init namespace is needed.\nUI:N - The attacker performs every step itself (namespace creation, shmget/fork/exit, sysctl write); no victim action or cooperation is involved.\nS:U - The use-after-free corrupts kernel slab memory and is exploited within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed radix_tree_node is read after reuse and its slot contents are propagated as a kernel pointer that is dereferenced, and since the node cache is shared with page-cache xa_nodes the attacker can leverage the stale reads to disclose arbitrary kernel memory and defeat KASLR.\nI:H - The stale slot value is container_of()'d into a shmid_kernel and then written through \u2014 spin_lock() on shm_perm.lock, shp->shm_file = NULL, refcount decrement and fput() on an attacker-influenced pointer \u2014 giving type confusion with write and arbitrary-free primitives suitable for privilege escalation.\nA:H - The slab-use-after-free read of a freed radix_tree_node reliably produces a KASAN splat, oops, or panic from wild-pointer dereference in the ipc teardown path, crashing the kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "5f1e1573bf103303944fd7225559de5d8297539c", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "b968ba8bfd9f90914957bbbd815413bf6a98eca7", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "74bc813d11c30e28fc5261dc877cca662ccfac68", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "78297d53d3878d43c1d627d20cd09f611fa4b91d", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "5180561afff8e0f029073c8c8117c95c6512d1f9", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "68c173ea138b66d7dd1fd980c9bc578a18e11884", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "b0b6bf90ce2699a574b3683e22c44d0dcdd7a057", "versionType": "git"}, {"status": "affected", "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "d66adabe91803ef34a8b90613c81267b5ded1472", "versionType": "git"}], "programFiles": ["ipc/shm.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.1"}, {"status": "unaffected", "version": "0", "lessThan": "3.1", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.295", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.239", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.186", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.142", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.95", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.35", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.4", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["ipc/shm.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c"}, {"url": "https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7"}, {"url": "https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68"}, {"url": "https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d"}, {"url": "https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9"}, {"url": "https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884"}, {"url": "https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057"}, {"url": "https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipc: fix to protect IPCS lookups using RCU\n\nsyzbot reported that it discovered a use-after-free vulnerability, [0]\n\n[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/\n\nidr_for_each() is protected by rwsem, but this is not enough. If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.295", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.239", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.186", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.142", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.95", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.35", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15.4", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16", "versionStartIncluding": "3.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:24.601Z"}}}, "cveMetadata": {"cveId": "CVE-2025-38212", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:52:11.622Z", "dateReserved": "2025-04-16T04:51:23.994Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-07-04T13:37:30.957Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipc: correcci\u00f3n para proteger las b\u00fasquedas IPCS mediante RCU. syzbot inform\u00f3 del descubrimiento de una vulnerabilidad de use-after-free, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() est\u00e1 protegido por rwsem, pero esto no es suficiente. Si no est\u00e1 protegido por la regi\u00f3n cr\u00edtica de lectura de RCU, cuando idr_for_each() llama a radix_tree_node_free() mediante call_rcu() para liberar la estructura radix_tree_node, el nodo se liberar\u00e1 inmediatamente y, al leer el siguiente nodo en radix_tree_for_each_slot(), se podr\u00e1 leer la memoria ya liberada. Por lo tanto, necesitamos agregar c\u00f3digo para asegurarnos de que idr_for_each() est\u00e9 protegido dentro de la regi\u00f3n cr\u00edtica de lectura de RCU cuando lo llamamos en shm_destroy_orphaned()."}], "id": "CVE-2025-38212", "lastModified": "2026-10-15T22:18:35.450", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38212", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:48:35.362340Z", "version": "2.0.3"}}]}, "published": "2025-07-04T14:15:29.473", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipc: fix to protect IPCS lookups using RCU", "id": "2376396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376396"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipc: fix to protect IPCS lookups using RCU\nsyzbot reported that it discovered a use-after-free vulnerability, [0]\n[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/\nidr_for_each() is protected by rwsem, but this is not enough. If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned()."], "name": "CVE-2025-38212", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38212\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38212\nhttps://lore.kernel.org/linux-cve-announce/2025070422-CVE-2025-38212-5bd9@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T21:47:55.369272+00:00", "updated": "2025-07-13T21:47:55.369318+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}