CVE-2025-40149 (GCVE-0-2025-40149)
Vulnerability from cvelistv5
Published
2025-11-12 10:23
Modified
2026-10-15 22:02
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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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"2b1bef126bbb8d0da51491357559126d567c1dee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"e37ca0092ddace60833790b4ad7a390408fb1be9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"13159c7125636371543a82cb7bbae00ab36730cc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"f09cd209359a23f88d4f3fa3d2379d057027e53c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"feb474ddbf26b51f462ae2e60a12013bdcfc5407\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e8f69799810c32dd40c6724d829eccc70baad07f\", \"lessThan\": \"c65f27b9c3be2269918e1cbad6d8884741f835c5\", \"versionType\": \"git\"}], \"programFiles\": [\"net/tls/tls_device.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.161\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.121\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.66\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/tls/tls_device.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2b1bef126bbb8d0da51491357559126d567c1dee\"}, {\"url\": \"https://git.kernel.org/stable/c/e37ca0092ddace60833790b4ad7a390408fb1be9\"}, {\"url\": \"https://git.kernel.org/stable/c/13159c7125636371543a82cb7bbae00ab36730cc\"}, {\"url\": \"https://git.kernel.org/stable/c/f09cd209359a23f88d4f3fa3d2379d057027e53c\"}, {\"url\": \"https://git.kernel.org/stable/c/feb474ddbf26b51f462ae2e60a12013bdcfc5407\"}, {\"url\": \"https://git.kernel.org/stable/c/c65f27b9c3be2269918e1cbad6d8884741f835c5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.161\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.121\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.66\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.3\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18\", \"versionStartIncluding\": \"4.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:08:04.814Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40149\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T22:02:38.910Z\", \"dateReserved\": \"2025-04-16T07:20:57.175Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-11-12T10:23:27.122Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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