CVE-2025-38212 (GCVE-0-2025-38212)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2026-08-05 12:00
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipc: fix to protect IPCS lookups using RCU syzbot reported that it discovered a use-after-free vulnerability, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() is protected by rwsem, but this is not enough. If it is not protected by RCU read-critical region, when idr_for_each() calls radix_tree_node_free() through call_rcu() to free the radix_tree_node structure, the node will be freed immediately, and when reading the next node in radix_tree_for_each_slot(), the already freed memory may be read. Therefore, we need to add code to make sure that idr_for_each() is protected within the RCU read-critical region when we call it in shm_destroy_orphaned().
References
Impacted products
Vendor Product Version
Linux Linux Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
Version: b34a6b1da371ed8af1221459a18c67970f7e3d53
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              "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-\u003euser_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()\u0027d into a shmid_kernel and then written through \u2014 spin_lock() on shm_perm.lock, shp-\u003eshm_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."
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    "datePublished": "2025-07-04T13:37:30.957Z",
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