{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-37894", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.964Z", "datePublished": "2025-05-20T15:21:31.283Z", "dateUpdated": "2026-08-05T11:58:09.042Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:58:09.042Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: use sock_gen_put() when sk_state is TCP_TIME_WAIT\n\nIt is possible for a pointer of type struct inet_timewait_sock to be\nreturned from the functions __inet_lookup_established() and\n__inet6_lookup_established(). This can cause a crash when the\nreturned pointer is of type struct inet_timewait_sock and\nsock_put() is called on it. The following is a crash call stack that\nshows sk->sk_wmem_alloc being accessed in sk_free() during the call to\nsock_put() on a struct inet_timewait_sock pointer. To avoid this issue,\nuse sock_gen_put() instead of sock_put() when sk->sk_state\nis TCP_TIME_WAIT.\n\nmrdump.ko ipanic() + 120\nvmlinux notifier_call_chain(nr_to_call=-1, nr_calls=0) + 132\nvmlinux atomic_notifier_call_chain(val=0) + 56\nvmlinux panic() + 344\nvmlinux add_taint() + 164\nvmlinux end_report() + 136\nvmlinux kasan_report(size=0) + 236\nvmlinux report_tag_fault() + 16\nvmlinux do_tag_recovery() + 16\nvmlinux __do_kernel_fault() + 88\nvmlinux do_bad_area() + 28\nvmlinux do_tag_check_fault() + 60\nvmlinux do_mem_abort() + 80\nvmlinux el1_abort() + 56\nvmlinux el1h_64_sync_handler() + 124\nvmlinux > 0xFFFFFFC080011294()\nvmlinux __lse_atomic_fetch_add_release(v=0xF2FFFF82A896087C)\nvmlinux __lse_atomic_fetch_sub_release(v=0xF2FFFF82A896087C)\nvmlinux arch_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C)\n+ 8\nvmlinux raw_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C)\n+ 8\nvmlinux atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C) + 8\nvmlinux __refcount_sub_and_test(i=1, r=0xF2FFFF82A896087C,\noldp=0) + 8\nvmlinux __refcount_dec_and_test(r=0xF2FFFF82A896087C, oldp=0) + 8\nvmlinux refcount_dec_and_test(r=0xF2FFFF82A896087C) + 8\nvmlinux sk_free(sk=0xF2FFFF82A8960700) + 28\nvmlinux sock_put() + 48\nvmlinux tcp6_check_fraglist_gro() + 236\nvmlinux tcp6_gro_receive() + 624\nvmlinux ipv6_gro_receive() + 912\nvmlinux dev_gro_receive() + 1116\nvmlinux napi_gro_receive() + 196\nccmni.ko ccmni_rx_callback() + 208\nccmni.ko ccmni_queue_recv_skb() + 388\nccci_dpmaif.ko dpmaif_rxq_push_thread() + 1088\nvmlinux kthread() + 268\nvmlinux 0xFFFFFFC08001F30C()" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code executes in the GRO packet-receive softirq path (`napi_gro_receive` → `ipv4/ipv6_gro_receive` → `tcp4/6_gro_receive` → `tcp4/6_check_fraglist_gro`), triggered purely by TCP segments arriving from the network. The reported real-world crash occurred on a modem/WAN interface receiving internet traffic.\nAC:L - The attacker controls both sides of the race — it creates the TIME_WAIT sockets by opening and closing connections, deterministically tears them down on demand by sending an RST or out-of-window SYN for the same 4-tuple (`TCP_TW_RST`/`TCP_TW_SYN` → `inet_twsk_deschedule_put()`), and concurrently floods matching segments that drive the GRO lookup on other RX queues, so the final `sock_put()` reliably lands on a dying twsk. It can also groom the dedicated `tw_sock_TCP` slab to place a chosen victim object next to the out-of-bounds decrement.\nPR:N - No credentials or privileges of any kind are needed — GRO processing happens in softirq on raw received packets long before any socket-level authentication or delivery, and creating TIME_WAIT state only requires connecting to any reachable TCP port or emitting traffic through the box.\nUI:N - Exploitation is fully driven by attacker-transmitted packets; no local user action, mount, or file access is required.\nS:U - The out-of-bounds decrement, the potential indirect call, and the resulting corruption are all confined to the kernel's own memory and security authority, with no crossing into a hypervisor, IOMMU, or other security scope.\nC:H - The mistyped free reads far past the 264-byte timewait object — `sk_prot_creator` at +600 and `sk_destruct` at +736 — and the corrupted neighbouring `hlist_nulls` pointers turn subsequent ehash walks into reads of attacker-influenced addresses, giving a path to arbitrary kernel memory disclosure.\nI:H - `sk_free()` performs an atomic 32-bit read-modify-write 116 bytes out of bounds into an adjacent live `tcp_timewait_sock`, corrupting its hash-list pointers, which are later written through by `sk_nulls_del_node_init_rcu()`; if the OOB word reads 1, `__sk_destruct()` additionally makes an indirect call through a function pointer sourced from out-of-bounds heap data, yielding a control-flow hijack primitive.\nA:H - The bug was reported as a confirmed kernel panic (KASAN/MTE tag-check fault in `sk_free()` → `panic()`), and a remote unauthenticated attacker can retrigger the out-of-bounds refcount decrement repeatedly, crashing the machine at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_offload.c", "net/ipv6/tcpv6_offload.c" ], "versions": [ { "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8", "lessThan": "c0dba059b118b5206e755042b15b49368a388898", "status": "affected", "versionType": "git" }, { "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8", "lessThan": "786650e644c5b1c063921799ca203c0b8670d79a", "status": "affected", "versionType": "git" }, { "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8", "lessThan": "f920436a44295ca791ebb6dae3f4190142eec703", "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/ipv4/tcp_offload.c", "net/ipv6/tcpv6_offload.c" ], "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.28", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.6", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "6.10", "versionEndExcluding": "6.12.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.14.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c0dba059b118b5206e755042b15b49368a388898" }, { "url": "https://git.kernel.org/stable/c/786650e644c5b1c063921799ca203c0b8670d79a" }, { "url": "https://git.kernel.org/stable/c/f920436a44295ca791ebb6dae3f4190142eec703" } ], "title": "net: use sock_gen_put() when sk_state is TCP_TIME_WAIT", "x_generator": { "engine": "bippy-1.2.0" } } } }