CVE-2025-39978 (GCVE-0-2025-39978)
Vulnerability from cvelistv5
Published
2025-10-15 07:55
Modified
2026-08-05 12:06
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: octeontx2-pf: Fix potential use after free in otx2_tc_add_flow() This code calls kfree_rcu(new_node, rcu) and then dereferences "new_node" and then dereferences it on the next line. Two lines later, we take a mutex so I don't think this is an RCU safe region. Re-order it to do the dereferences before queuing up the free.
References
Impacted products
Vendor Product Version
Linux Linux Version: 68fbff68dbea35f9e6f7649dd22fce492a5aedac
Version: 68fbff68dbea35f9e6f7649dd22fce492a5aedac
Version: 68fbff68dbea35f9e6f7649dd22fce492a5aedac
Version: 68fbff68dbea35f9e6f7649dd22fce492a5aedac
Version: 68fbff68dbea35f9e6f7649dd22fce492a5aedac
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            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: Fix potential use after free in otx2_tc_add_flow()\n\nThis code calls kfree_rcu(new_node, rcu) and then dereferences \"new_node\"\nand then dereferences it on the next line.  Two lines later, we take\na mutex so I don\u0027t think this is an RCU safe region.  Re-order it to do\nthe dereferences before queuing up the free."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached only through a local `RTM_NEWTFILTER` netlink message installing a tc flower filter with a police action on an octeontx2 PF/VF/representor netdev. There is no remote packet-processing path into `otx2_tc_add_flow()`.\nAC:L - The attacker deterministically forces the `free_leaf:` error path by installing police-action flower rules until MCAM/mbox resources are exhausted, and widens the RCU grace-period window at will by contending `nic-\u003embox.lock` from a second thread so `mutex_lock()` sleeps. Both the free and the reclaim/spray side are under attacker control.\nPR:L - Only CAP_NET_ADMIN over the netns owning the device is needed, and `otx2_setup_tc` is shared by the VF (`otx2_vf.c:535`) and representor (`rep.c:495`) drivers, whose netdevs are commonly delegated into container netns owned by unprivileged user namespaces where container-root holds CAP_NET_ADMIN with no init-namespace privilege.\nUI:N - The entire sequence is driven by the attacker\u0027s own netlink filter-install requests. No victim action or cooperation is involved.\nS:U - The use-after-free corrupts kernel heap and driver state within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `struct otx2_tc_flow` is read back after reclaim, giving a read primitive over whatever slab object replaced it, and the stale `rq`/`leaf_profile` values are further exposed to userspace through `netdev_err()` kernel-log messages.\nI:H - `__clear_bit(new_node-\u003erq, \u0026nic-\u003erq_bmap)` uses a UAF-derived u16 index against a single `unsigned long`, yielding an out-of-bounds bit clear up to ~8 KB into and past `struct otx2_nic` (mbox state, queue and function pointers), and the stale `leaf_profile` makes firmware tear down another flow\u0027s hardware policer, silently defeating QoS/rate-limit enforcement.\nA:H - A use-after-free on a slab object combined with an out-of-bounds bit clear into the driver\u0027s private structure reliably oopses the kernel or wedges the NIC\u0027s mailbox/queue state, and the attacker can repeat it at will."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39978",
    "datePublished": "2025-10-15T07:55:58.949Z",
    "dateReserved": "2025-04-16T07:20:57.150Z",
    "dateUpdated": "2026-08-05T12:06:47.202Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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