{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38212", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.994Z", "datePublished": "2025-07-04T13:37:30.957Z", "dateUpdated": "2026-08-05T12:00:24.601Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:24.601Z" }, "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()." } ], "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 — 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 — spin_lock() on shm_perm.lock, shp->shm_file = NULL, refcount decrement and fput() on an attacker-influenced pointer — 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": "5f1e1573bf103303944fd7225559de5d8297539c", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "b968ba8bfd9f90914957bbbd815413bf6a98eca7", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "74bc813d11c30e28fc5261dc877cca662ccfac68", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "78297d53d3878d43c1d627d20cd09f611fa4b91d", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "5180561afff8e0f029073c8c8117c95c6512d1f9", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "68c173ea138b66d7dd1fd980c9bc578a18e11884", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "b0b6bf90ce2699a574b3683e22c44d0dcdd7a057", "status": "affected", "versionType": "git" }, { "version": "b34a6b1da371ed8af1221459a18c67970f7e3d53", "lessThan": "d66adabe91803ef34a8b90613c81267b5ded1472", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "ipc/shm.c" ], "versions": [ { "version": "3.1", "status": "affected" }, { "version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.295", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.239", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.186", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.95", "lessThanOrEqual": "6.6.*", "status": "unaffected", "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", "versionEndExcluding": "6.1.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.15.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.16" } ] } ] } ], "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" } ], "title": "ipc: fix to protect IPCS lookups using RCU", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:35:31.589Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:41:40.522Z" }, "affected": [ { "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 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": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }