CVE-2025-38003 (GCVE-0-2025-38003)
Vulnerability from cvelistv5
Published
2025-06-08 10:34
Modified
2026-08-05 11:58
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: can: bcm: add missing rcu read protection for procfs content When the procfs content is generated for a bcm_op which is in the process to be removed the procfs output might show unreliable data (UAF). As the removal of bcm_op's is already implemented with rcu handling this patch adds the missing rcu_read_lock() and makes sure the list entries are properly removed under rcu protection.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5b48f5711f1c630841ab78dcc061de902f0e37bf
Version: 85cd41070df992d3c0dfd828866fdd243d3b774a
Version: f34f2a18e47b73e48f90a757e1f4aaa8c7d665a1
Version: f1b4e32aca0811aa011c76e5d6cf2fa19224b386
Version: f1b4e32aca0811aa011c76e5d6cf2fa19224b386
Version: f1b4e32aca0811aa011c76e5d6cf2fa19224b386
Version: f1b4e32aca0811aa011c76e5d6cf2fa19224b386
Version: f1b4e32aca0811aa011c76e5d6cf2fa19224b386
Version: fbac09a3b8890003c0c55294c00709f3ae5501bb
Version: edb4baffb9483141a50fb7f7146cfe4a4c0c2db8
Version: 5.4.205   ≤
Version: 5.10.130   ≤
Version: 5.15.54   ≤
Version: 4.19.252   ≤
Version: 5.18.11   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu read protection for procfs content\n\nWhen the procfs content is generated for a bcm_op which is in the process\nto be removed the procfs output might show unreliable data (UAF).\n\nAs the removal of bcm_op\u0027s is already implemented with rcu handling this\npatch adds the missing rcu_read_lock() and makes sure the list entries\nare properly removed under rcu protection."
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            "version": "3.1"
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              "value": "AV:L - Exploitation requires a local account to open a PF_CAN/CAN_BCM socket, issue RX_SETUP/RX_DELETE via sendmsg(), and read /proc/net/can-bcm/\u003cinode\u003e. No remote or adjacent network path reaches the racing procfs reader.\nAC:L - The attacker controls both sides of the race entirely \u2014 one thread loops reading the procfs entry while another loops RX_SETUP/RX_DELETE \u2014 and bcm_proc_show() held no lock whatsoever against the deleter, so the window is hit reliably by simple repetition; a working PoC was produced by the reporter for this bcm series.\nPR:L - can_create() performs no capability check, connect() with ifindex 0 needs no CAN device, and the created proc entry is mode 0644, so any unprivileged local user can drive the whole sequence in its own process (module autoload of can/can-bcm is also unprivileged).\nUI:N - The attacker performs every step itself \u2014 socket setup, op deletion, and reading its own procfs file \u2014 with no action by any other user.\nS:U - The freed object, the disclosure, and the crash are all within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Fields are read from a freed bcm_op and formatted directly into world-readable procfs output; since bcm_op lands in the sprayable kmalloc-512 cache, an attacker reclaiming it controls the list cursor and can steer the walk to arbitrary kernel addresses, leaking their contents to userspace.\nI:H - This is a use-after-free on an attacker-reclaimable slab object whose linkage pointers are dereferenced after free, a primitive that combined with heap grooming is leveraged for kernel state corruption and control-flow influence.\nA:H - A concurrent plain list_del() leaves LIST_POISON1 in the cursor, so the unprotected walker dereferences a non-canonical/freed pointer and oopses; the walk can also spin over reclaimed memory or hit a divide-by-zero on a re-read frames_abs, crashing or hanging the kernel."
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          "url": "https://git.kernel.org/stable/c/dac5e6249159ac255dad9781793dbe5908ac9ddb"
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    "cveId": "CVE-2025-38003",
    "datePublished": "2025-06-08T10:34:55.808Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2026-08-05T11:58:54.550Z",
    "state": "PUBLISHED"
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