{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40149", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.175Z", "datePublished": "2025-11-12T10:23:27.122Z", "dateUpdated": "2026-10-15T22:02:38.910Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:08:04.814Z" }, "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)->dev could trigger UAF.\n\nLet's use __sk_dst_get() and dst_dev_rcu().\n\nNote that the only ->ndo_sk_get_lower_dev() user is\nbond_sk_get_lower_dev(), which uses RCU." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "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 — 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 — 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's own netns — and can retry indefinitely until the window between reading `dst->dev` 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's own user+net namespace via `unshare -Urn`, not real root.\nUI:N - Exploitation is driven entirely by the attacker's 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's 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->netdev_ops` from freed memory and the caller subsequently reads `netdev->features` and `netdev->flags`, 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 — `ops->ndo_sk_get_lower_dev(dev, sk)` and later `netdev->tlsdev_ops->tls_dev_add(...)` — 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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_device.c" ], "versions": [ { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "2b1bef126bbb8d0da51491357559126d567c1dee", "status": "affected", "versionType": "git" }, { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "e37ca0092ddace60833790b4ad7a390408fb1be9", "status": "affected", "versionType": "git" }, { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "13159c7125636371543a82cb7bbae00ab36730cc", "status": "affected", "versionType": "git" }, { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "f09cd209359a23f88d4f3fa3d2379d057027e53c", "status": "affected", "versionType": "git" }, { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "feb474ddbf26b51f462ae2e60a12013bdcfc5407", "status": "affected", "versionType": "git" }, { "version": "e8f69799810c32dd40c6724d829eccc70baad07f", "lessThan": "c65f27b9c3be2269918e1cbad6d8884741f835c5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_device.c" ], "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.161", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.121", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.66", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.161" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.17.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18" } ] } ] } ], "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" } ], "title": "tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:09:01.130Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.7", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { 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