CVE-2025-40149 (GCVE-0-2025-40149)
Vulnerability from cvelistv5
Published
2025-11-12 10:23
Modified
2026-08-05 12:08
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: tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock(). get_netdev_for_sock() is called during setsockopt(), so not under RCU. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the only ->ndo_sk_get_lower_dev() user is bond_sk_get_lower_dev(), which uses RCU.
References
Impacted products
Vendor Product Version
Linux Linux Version: e8f69799810c32dd40c6724d829eccc70baad07f
Version: e8f69799810c32dd40c6724d829eccc70baad07f
Version: e8f69799810c32dd40c6724d829eccc70baad07f
Version: e8f69799810c32dd40c6724d829eccc70baad07f
Version: e8f69799810c32dd40c6724d829eccc70baad07f
Version: e8f69799810c32dd40c6724d829eccc70baad07f
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().\n\nget_netdev_for_sock() is called during setsockopt(),\nso not under RCU.\n\nUsing sk_dst_get(sk)-\u003edev could trigger UAF.\n\nLet\u0027s use __sk_dst_get() and dst_dev_rcu().\n\nNote that the only -\u003endo_sk_get_lower_dev() user is\nbond_sk_get_lower_dev(), which uses RCU."
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              "lang": "en",
              "value": "AV:L - `get_netdev_for_sock()` has exactly two callers, `tls_set_device_offload()` and `tls_set_device_offload_rx()`, both reachable only from `setsockopt(SOL_TLS, TLS_TX/TLS_RX)` in process context \u2014 no received TLS record or remote peer data drives this path. The racing `dst_dev_put()` side likewise requires local netlink link/route teardown, so the entire attack is delivered through local syscalls.\nAC:L - The attacker controls both sides of the race \u2014 one thread repeatedly issues `setsockopt(TLS_TX)` on TCP sockets whose `sk_dst_cache` points at a veth while another deletes that veth in the attacker\u0027s own netns \u2014 and can retry indefinitely until the window between reading `dst-\u003edev` and the `netdev_ref_replace()`/free is hit. `CONFIG_TLS_DEVICE` is a routinely enabled distro option, and the vulnerable read happens before any NIC-capability or `IFF_UP` gate, so no special hardware is required.\nPR:L - An ordinary unprivileged local account suffices: attaching the tls ULP and calling `setsockopt(SOL_TLS, ...)` requires no capability once the ULP is registered (the `capable(CAP_NET_ADMIN)` check in `__tcp_ulp_find_autoload()` gates only module autoload), and the CAP_NET_ADMIN needed to create and delete the veth is obtained in the attacker\u0027s own user+net namespace via `unshare -Urn`, not real root.\nUI:N - Exploitation is driven entirely by the attacker\u0027s own threads issuing socket syscalls and netlink link/route operations; no victim action, mount, or file open is involved.\nS:U - The use-after-free is on a kernel `struct net_device` and its consequences remain within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free on a freed, heap-sprayable `net_device`: `netdev_sk_get_lower_dev()` reads `dev-\u003enetdev_ops` from freed memory and the caller subsequently reads `netdev-\u003efeatures` and `netdev-\u003eflags`, whose values are observable through the setsockopt return code and the resulting offload state, giving an attacker-groomable read of reclaimed kernel memory.\nI:H - The freed object is used for two indirect calls \u2014 `ops-\u003endo_sk_get_lower_dev(dev, sk)` and later `netdev-\u003etlsdev_ops-\u003etls_dev_add(...)` \u2014 both function pointers loaded out of reclaimed memory, and `dev_hold(lowest_dev)` performs a refcount increment inside the freed allocation, together yielding control-flow-hijack and write primitives once the slab is sprayed.\nA:H - Dereferencing and indirect-calling through a freed `net_device` reliably oopses the kernel even when not weaponized, and the race is repeatable at will by an unprivileged local user for a persistent denial of service."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2b1bef126bbb8d0da51491357559126d567c1dee"
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          "url": "https://git.kernel.org/stable/c/e37ca0092ddace60833790b4ad7a390408fb1be9"
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      "title": "tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40149",
    "datePublished": "2025-11-12T10:23:27.122Z",
    "dateReserved": "2025-04-16T07:20:57.175Z",
    "dateUpdated": "2026-08-05T12:08:04.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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