{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-38570", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-38570" ], "published": "2024-06-19T13:36:08Z", "summary": "gfs2: Fix potential glock use-after-free on unmount", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix potential glock use-after-free on unmount\n\nWhen a DLM lockspace is released and there ares still locks in that\nlockspace, DLM will unlock those locks automatically. Commit\nfb6791d100d1b started exploiting this behavior to speed up filesystem\nunmount: gfs2 would simply free glocks it didn't want to unlock and then\nrelease the lockspace. This didn't take the bast callbacks for\nasynchronous lock contention notifications into account, which remain\nactive until until a lock is unlocked or its lockspace is released.\n\nTo prevent those callbacks from accessing deallocated objects, put the\nglocks that should not be unlocked on the sd_dead_glocks list, release\nthe lockspace, and only then free those glocks.\n\nAs an additional measure, ignore unexpected ast and bast callbacks if\nthe receiving glock is dead.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { 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"c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.33" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-38570" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0636b34b44589b142700ac137b5f69802cfe2e37" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e42e8a24d7f02d28763d16ca7ec5fc6d1f142af0" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/501cd8fabf621d10bd4893e37f6ce6c20523c8ca" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d98779e687726d8f8860f1c54b5687eec5f63a73" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 9.8, "cvss_v3_severity": "Critical", "scenario": "AV:N - The use-after-free is driven by a DLM protocol message from a remote cluster node (`receive_bast`/`receive_request` over the DLM TCP/SCTP interconnect), which dispatches `gdlm_bast()` on the already-freed glock. The DLM interconnect is routable IP, not restricted to a single L2 segment.\nAC:L - The attacker fully controls the contention side and can hold conflicting locks on many resources continuously so that a bast is guaranteed to land in the unmount window, which is wide (it spans `truncate_inode_pages_final()` and `gfs2_delete_debugfs_file()`); unmounts of clustered GFS2 volumes are routine and repeatable events in pacemaker-managed clusters, so the race is reliably winnable.\nPR:N - No credentials or privileges on the victim node are needed \u2014 the DLM peer's lock request is not authenticated per-user by the target, and an ordinary unprivileged user on any cluster node generates the required contention with plain file access on the shared filesystem.\nUI:N - No victim action is solicited by the attacker; the unmount is a routine cluster/administrative operation and the callback fires automatically from the DLM workqueue.\nS:U - The freed object and the corrupted state are both kernel memory in the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A use-after-free on a `gfs2_glock` slab object allows the freed allocation to be reclaimed by attacker-influenced data and then read/leaked through glock state and the subsequent `dump_glock_func` path, giving arbitrary kernel-memory disclosure potential.\nI:H - `gfs2_glock_cb()` writes into the freed object (lockref count, `gl_flags`, `gl_demote_state`) and then queues `&gl->gl_work`, so a reallocated object supplies the `delayed_work` timer/work function pointer \u2014 a control-flow hijack and arbitrary-write primitive.\nA:H - Even unexploited, the UAF corrupts a spinlock and refcount in freed memory and reaches `BUG_ON`/`BUG()` in `gdlm_ast()`, causing kernel oops or panic on the unmounting node." } } }