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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory\n\nIgnore nCR3[4:0] when loading PDPTEs from memory for nested SVM, as bits\n4:0 of CR3 are ignored when PAE paging is used, and thus VMRUN doesn\u0027t\nenforce 32-byte alignment of nCR3.\n\nIn the absolute worst case scenario, failure to ignore bits 4:0 can result\nin an out-of-bounds read, e.g. if the target page is at the end of a\nmemslot, and the VMM isn\u0027t using guard pages.\n\nPer the APM:\n\n  The CR3 register points to the base address of the page-directory-pointer\n  table. The page-directory-pointer table is aligned on a 32-byte boundary,\n  with the low 5 address bits 4:0 assumed to be 0.\n\nAnd the SDM\u0027s much more explicit:\n\n  4:0    Ignored\n\nNote, KVM gets this right when loading PDPTRs, it\u0027s only the nSVM flow\nthat is broken."
        }
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              "value": "AV:L - The attacker must execute code on the host machine, specifically CPL0 inside an L1 guest, issuing VMRUN with an attacker-chosen nCR3; there is no network protocol involved. Guest-to-host attacks against KVM are scored as local access to the host.\nAC:L - Every precondition is under the attacker\u0027s control \u2014 L1 chooses 32-bit PAE mode, sets the NPT enable bit, and sets nCR3[4:0]; nested SVM and NPT are enabled by default in kvm_amd, and nCR3 receives no alignment validation, so the out-of-bounds read triggers deterministically on the first VMRUN. The guest knows its own e820 map and can aim at a memslot-terminating gfn and retry against every memslot boundary.\nPR:L - The attacker needs kernel-level (CPL0) control of a guest VM whose CPUID exposes SVM \u2014 i.e. an ordinary tenant VM on a nested-virtualization-enabled AMD host, which is a low privilege level relative to the host kernel being attacked. No host-side root or /dev/kvm privileges beyond running one\u0027s own VM are required.\nUI:N - Exploitation is entirely driven by instructions the attacker executes in its own guest; no host administrator or other user needs to take any action.\nS:C - The vulnerable component is KVM in the host kernel, but the impacted resource is host VMM process memory lying outside the guest\u0027s memslot, so the attack crosses the guest/host security boundary. This is the classic KVM guest-to-host scope change.\nC:H - Up to 31 bytes past the end of every memslot in the host VMM\u0027s address space can be read, and the value is recoverable by the guest through the shadow-NPT root oracle in mmu_alloc_shadow_roots(), disclosing host heap contents and pointers that defeat host ASLR. It is repeatable at each memslot boundary, so it is not strictly bounded to a few bytes at one fixed location.\nI:N - The defect is purely a read; the resulting PDPTE only influences translations that remain gated by kvm_vcpu_is_visible_gfn() and normal memslot lookup, and any accessed/dirty writes land in the attacker\u0027s own L1 memory. No host memory is corrupted and no control-flow primitive is produced.\nA:H - In affected v6.12-rc1..rc4 kernels the same guest-controlled offset trips the WARN_ON_ONCE(offset + len \u003e PAGE_SIZE) hardening check in __kvm_read_guest_page(), giving a guest-triggerable host kernel WARN that panics the entire host \u2014 and all co-resident VMs \u2014 on the widely used panic_on_warn=1 configuration."
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          "url": "https://git.kernel.org/stable/c/f559b2e9c5c5308850544ab59396b7d53cfc67bd"
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      "title": "KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: devmap: provide rxq after redirect\n\nrxq contains a pointer to the device from where\nthe redirect happened. Currently, the BPF program\nthat was executed after a redirect via BPF_MAP_TYPE_DEVMAP*\ndoes not have it set.\n\nThis is particularly bad since accessing ingress_ifindex, e.g.\n\nSEC(\"xdp\")\nint prog(struct xdp_md *pkt)\n{\n        return bpf_redirect_map(\u0026dev_redirect_map, 0, 0);\n}\n\nSEC(\"xdp/devmap\")\nint prog_after_redirect(struct xdp_md *pkt)\n{\n        bpf_printk(\"ifindex %i\", pkt-\u003eingress_ifindex);\n        return XDP_PASS;\n}\n\ndepends on access to rxq, so a NULL pointer gets dereferenced:\n\n\u003c1\u003e[  574.475170] BUG: kernel NULL pointer dereference, address: 0000000000000000\n\u003c1\u003e[  574.475188] #PF: supervisor read access in kernel mode\n\u003c1\u003e[  574.475194] #PF: error_code(0x0000) - not-present page\n\u003c6\u003e[  574.475199] PGD 0 P4D 0\n\u003c4\u003e[  574.475207] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n\u003c4\u003e[  574.475217] CPU: 4 UID: 0 PID: 217 Comm: kworker/4:1 Not tainted 6.11.0-rc5-reduced-00859-g780801200300 #23\n\u003c4\u003e[  574.475226] Hardware name: Intel(R) Client Systems NUC13ANHi7/NUC13ANBi7, BIOS ANRPL357.0026.2023.0314.1458 03/14/2023\n\u003c4\u003e[  574.475231] Workqueue: mld mld_ifc_work\n\u003c4\u003e[  574.475247] RIP: 0010:bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n\u003c4\u003e[  574.475257] Code: cc cc cc cc cc cc cc 80 00 00 00 cc cc cc cc cc cc cc cc f3 0f 1e fa 0f 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 48 8b 57 20 \u003c48\u003e 8b 52 00 8b 92 e0 00 00 00 48 bf f8 a6 d5 c4 5d a0 ff ff be 0b\n\u003c4\u003e[  574.475263] RSP: 0018:ffffa62440280c98 EFLAGS: 00010206\n\u003c4\u003e[  574.475269] RAX: ffffa62440280cd8 RBX: 0000000000000001 RCX: 0000000000000000\n\u003c4\u003e[  574.475274] RDX: 0000000000000000 RSI: ffffa62440549048 RDI: ffffa62440280ce0\n\u003c4\u003e[  574.475278] RBP: ffffa62440280c98 R08: 0000000000000002 R09: 0000000000000001\n\u003c4\u003e[  574.475281] R10: ffffa05dc8b98000 R11: ffffa05f577fca40 R12: ffffa05dcab24000\n\u003c4\u003e[  574.475285] R13: ffffa62440280ce0 R14: ffffa62440549048 R15: ffffa62440549000\n\u003c4\u003e[  574.475289] FS:  0000000000000000(0000) GS:ffffa05f4f700000(0000) knlGS:0000000000000000\n\u003c4\u003e[  574.475294] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\u003c4\u003e[  574.475298] CR2: 0000000000000000 CR3: 000000025522e000 CR4: 0000000000f50ef0\n\u003c4\u003e[  574.475303] PKRU: 55555554\n\u003c4\u003e[  574.475306] Call Trace:\n\u003c4\u003e[  574.475313]  \u003cIRQ\u003e\n\u003c4\u003e[  574.475318]  ? __die+0x23/0x70\n\u003c4\u003e[  574.475329]  ? page_fault_oops+0x180/0x4c0\n\u003c4\u003e[  574.475339]  ? skb_pp_cow_data+0x34c/0x490\n\u003c4\u003e[  574.475346]  ? kmem_cache_free+0x257/0x280\n\u003c4\u003e[  574.475357]  ? exc_page_fault+0x67/0x150\n\u003c4\u003e[  574.475368]  ? asm_exc_page_fault+0x26/0x30\n\u003c4\u003e[  574.475381]  ? bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n\u003c4\u003e[  574.475386]  bq_xmit_all+0x158/0x420\n\u003c4\u003e[  574.475397]  __dev_flush+0x30/0x90\n\u003c4\u003e[  574.475407]  veth_poll+0x216/0x250 [veth]\n\u003c4\u003e[  574.475421]  __napi_poll+0x28/0x1c0\n\u003c4\u003e[  574.475430]  net_rx_action+0x32d/0x3a0\n\u003c4\u003e[  574.475441]  handle_softirqs+0xcb/0x2c0\n\u003c4\u003e[  574.475451]  do_softirq+0x40/0x60\n\u003c4\u003e[  574.475458]  \u003c/IRQ\u003e\n\u003c4\u003e[  574.475461]  \u003cTASK\u003e\n\u003c4\u003e[  574.475464]  __local_bh_enable_ip+0x66/0x70\n\u003c4\u003e[  574.475471]  __dev_queue_xmit+0x268/0xe40\n\u003c4\u003e[  574.475480]  ? selinux_ip_postroute+0x213/0x420\n\u003c4\u003e[  574.475491]  ? alloc_skb_with_frags+0x4a/0x1d0\n\u003c4\u003e[  574.475502]  ip6_finish_output2+0x2be/0x640\n\u003c4\u003e[  574.475512]  ? nf_hook_slow+0x42/0xf0\n\u003c4\u003e[  574.475521]  ip6_finish_output+0x194/0x300\n\u003c4\u003e[  574.475529]  ? __pfx_ip6_finish_output+0x10/0x10\n\u003c4\u003e[  574.475538]  mld_sendpack+0x17c/0x240\n\u003c4\u003e[  574.475548]  mld_ifc_work+0x192/0x410\n\u003c4\u003e[  574.475557]  process_one_work+0x15d/0x380\n\u003c4\u003e[  574.475566]  worker_thread+0x29d/0x3a0\n\u003c4\u003e[  574.475573]  ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e[  574.475580]  ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e[  574.475587]  kthread+0xcd/0x100\n\u003c4\u003e[  574.475597]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e[  574.475606]  ret_from_fork+0x31/0x50\n\u003c4\u003e[  574.475615]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e[  574.475623]  ret_from_fork_asm+0x1a/0x\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:N - The uninitialized `xdp.rxq` is consumed in the XDP fast path during packet receive \u2014 `net_rx_action \u2192 __napi_poll \u2192 veth_poll \u2192 __dev_flush \u2192 bq_xmit_all \u2192 dev_map_bpf_prog_run` \u2014 so remote frames arriving at an XDP-enabled router, load balancer or container host drive the faulting code. This matches the repo\u0027s treatment of sibling XDP-redirect data-path bugs (CVE-2025-38246, CVE-2025-68341, CVE-2024-57932), all scored AV:N.\nAC:L - On an affected configuration every redirected frame deterministically dereferences the stale stack pointer; no race, timing window, or memory-layout condition must be won. For the multi-buffer variant the attacker simply sends an oversized frame to reach `bpf_xdp_frags_increase_tail()`/`bpf_xdp_shrink_data()`.\nPR:N - The attacker only has to put frames on the wire \u2014 no credentials, account, or authentication on the target are involved, and the fault occurs in softirq before any user context. The CAP_BPF/CAP_NET_ADMIN needed to attach XDP and populate the devmap is the victim\u0027s own legitimate configuration of a documented UAPI field, equivalent to enabling a network service, not a step the attacker performs.\nUI:N - Processing happens entirely in NAPI/softirq on frame arrival with no local user involved; the reported oops occurred against background MLD traffic. No victim action is required at attack time.\nS:U - The wild read, the mis-sized `memset()`, and the type-confused page free all occur in kernel memory on the same host, within a single security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `xdp.rxq` holds stale softirq-stack data that is dereferenced as a `struct xdp_rxq_info *`, so `ingress_ifindex` (`rxq-\u003edev-\u003eifindex`), `rx_queue_index` (`rxq-\u003equeue_index`), `rxq-\u003efrag_size` and `rxq-\u003emem` are read from an arbitrary kernel address and returned into the BPF program, which can export them to userspace via maps or the perf ring. That is an unbounded kernel memory disclosure primitive.\nI:H - `bpf_xdp_frags_increase_tail()` derives `tailroom` from the garbage `rxq-\u003efrag_size`, which can underflow and defeat the `offset \u003e tailroom` bound on the following `memset()`, giving a heap out-of-bounds write past the page fragment. `bpf_xdp_shrink_data()` additionally passes a garbage `xdp_mem_info` into `__xdp_return()`, causing a type-confused free across page_pool / page_frag / put_page / xsk_buff_free \u2014 the standard basis for heap corruption and privilege escalation.\nA:H - The commit documents a reproducible `BUG: kernel NULL pointer dereference` oops in softirq context (`bq_xmit_all+0x158`), and a non-zero stale pointer yields an equally fatal wild-address fault or corrupted-free panic. Either way the machine oopses on ordinary inbound traffic, a full denial of service."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Make sure internal and UAPI bpf_redirect flags don\u0027t overlap\n\nThe bpf_redirect_info is shared between the SKB and XDP redirect paths,\nand the two paths use the same numeric flag values in the ri-\u003eflags\nfield (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that\nif skb bpf_redirect_neigh() is used with a non-NULL params argument and,\nsubsequently, an XDP redirect is performed using the same\nbpf_redirect_info struct, the XDP path will get confused and end up\ncrashing, which syzbot managed to trigger.\n\nWith the stack-allocated bpf_redirect_info, the structure is no longer\nshared between the SKB and XDP paths, so the crash doesn\u0027t happen\nanymore. However, different code paths using identically-numbered flag\nvalues in the same struct field still seems like a bit of a mess, so\nthis patch cleans that up by moving the flag definitions together and\nredefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap\nwith the flags used for XDP. It also adds a BUILD_BUG_ON() check to make\nsure the overlap is not re-introduced by mistake."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix data-races around sk-\u003esk_forward_alloc\n\nSyzkaller reported this warning:\n ------------[ cut here ]------------\n WARNING: CPU: 0 PID: 16 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x1c5/0x1e0\n Modules linked in:\n CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-rc5 #26\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n RIP: 0010:inet_sock_destruct+0x1c5/0x1e0\n Code: 24 12 4c 89 e2 5b 48 c7 c7 98 ec bb 82 41 5c e9 d1 18 17 ff 4c 89 e6 5b 48 c7 c7 d0 ec bb 82 41 5c e9 bf 18 17 ff 0f 0b eb 83 \u003c0f\u003e 0b eb 97 0f 0b eb 87 0f 0b e9 68 ff ff ff 66 66 2e 0f 1f 84 00\n RSP: 0018:ffffc9000008bd90 EFLAGS: 00010206\n RAX: 0000000000000300 RBX: ffff88810b172a90 RCX: 0000000000000007\n RDX: 0000000000000002 RSI: 0000000000000300 RDI: ffff88810b172a00\n RBP: ffff88810b172a00 R08: ffff888104273c00 R09: 0000000000100007\n R10: 0000000000020000 R11: 0000000000000006 R12: ffff88810b172a00\n R13: 0000000000000004 R14: 0000000000000000 R15: ffff888237c31f78\n FS:  0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007ffc63fecac8 CR3: 000000000342e000 CR4: 00000000000006f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cTASK\u003e\n  ? __warn+0x88/0x130\n  ? inet_sock_destruct+0x1c5/0x1e0\n  ? report_bug+0x18e/0x1a0\n  ? handle_bug+0x53/0x90\n  ? exc_invalid_op+0x18/0x70\n  ? asm_exc_invalid_op+0x1a/0x20\n  ? inet_sock_destruct+0x1c5/0x1e0\n  __sk_destruct+0x2a/0x200\n  rcu_do_batch+0x1aa/0x530\n  ? rcu_do_batch+0x13b/0x530\n  rcu_core+0x159/0x2f0\n  handle_softirqs+0xd3/0x2b0\n  ? __pfx_smpboot_thread_fn+0x10/0x10\n  run_ksoftirqd+0x25/0x30\n  smpboot_thread_fn+0xdd/0x1d0\n  kthread+0xd3/0x100\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x34/0x50\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1a/0x30\n  \u003c/TASK\u003e\n ---[ end trace 0000000000000000 ]---\n\nIts possible that two threads call tcp_v6_do_rcv()/sk_forward_alloc_add()\nconcurrently when sk-\u003esk_state == TCP_LISTEN with sk-\u003esk_lock unlocked,\nwhich triggers a data-race around sk-\u003esk_forward_alloc:\ntcp_v6_rcv\n    tcp_v6_do_rcv\n        skb_clone_and_charge_r\n            sk_rmem_schedule\n                __sk_mem_schedule\n                    sk_forward_alloc_add()\n            skb_set_owner_r\n                sk_mem_charge\n                    sk_forward_alloc_add()\n        __kfree_skb\n            skb_release_all\n                skb_release_head_state\n                    sock_rfree\n                        sk_mem_uncharge\n                            sk_forward_alloc_add()\n                            sk_mem_reclaim\n                                // set local var reclaimable\n                                __sk_mem_reclaim\n                                    sk_forward_alloc_add()\n\nIn this syzkaller testcase, two threads call\ntcp_v6_do_rcv() with skb-\u003etruesize=768, the sk_forward_alloc changes like\nthis:\n (cpu 1)             | (cpu 2)             | sk_forward_alloc\n ...                 | ...                 | 0\n __sk_mem_schedule() |                     | +4096 = 4096\n                     | __sk_mem_schedule() | +4096 = 8192\n sk_mem_charge()     |                     | -768  = 7424\n                     | sk_mem_charge()     | -768  = 6656\n ...                 |    ...              |\n sk_mem_uncharge()   |                     | +768  = 7424\n reclaimable=7424    |                     |\n                     | sk_mem_uncharge()   | +768  = 8192\n                     | reclaimable=8192    |\n __sk_mem_reclaim()  |                     | -4096 = 4096\n                     | __sk_mem_reclaim()  | -8192 = -4096 != 0\n\nThe skb_clone_and_charge_r() should not be called in tcp_v6_do_rcv() when\nsk-\u003esk_state is TCP_LISTEN, it happens later in tcp_v6_syn_recv_sock().\nFix the same issue in dccp_v6_do_rcv()."
        }
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      "metrics": [
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              "value": "AV:N - The vulnerable code is in the IPv6 TCP receive path (`tcp_v6_rcv()` \u2192 `tcp_v6_do_rcv()`), executed directly on inbound SYN packets from any remote peer; a remote attacker reaches it by sending TCP/IPv6 segments to a listening socket. The same defect exists in the DCCP IPv6 receive path.\nAC:L - The attacker controls both sides of the race by sending a burst of concurrent SYNs from different source ports/addresses, which RSS/RPS distributes across CPUs that all enter `tcp_v6_do_rcv()` on the same listener with no socket lock held. No memory layout, timing window outside attacker influence, or victim state is required, and syzkaller reproduces it routinely.\nPR:N - The racing code runs while processing a SYN on a listening socket, entirely before connection establishment or any authentication, so no credentials of any kind are needed. Setting the `IPV6_RECV*` option that arms the path is done by the victim server (or by an unprivileged local user on their own listener), not by the attacker.\nUI:N - Triggering requires only that packets be sent to an already-listening socket; no action by any local user or administrator is needed.\nS:U - The corrupted state (`sk-\u003esk_forward_alloc`, `tcp_memory_allocated`, memcg skmem counters) and the resulting warning/panic are all within the kernel\u0027s own security authority, with no crossing into a hypervisor, IOMMU, or other separate authority.\nC:N - The defect is a non-atomic read-modify-write on integer accounting counters; it produces no out-of-bounds read, no use-after-free, and no path by which memory contents or kernel pointers are disclosed to the attacker.\nI:N - No attacker-controlled data is written and no memory corruption primitive is created \u2014 only the socket\u0027s own memory-accounting counters become inconsistent, which is not a modification of protected data or control flow.\nA:H - The imbalance trips `WARN_ON_ONCE(sk_forward_alloc_get(sk))` in `inet_sock_destruct()` from softirq context, which is an immediate kernel panic on `panic_on_warn` systems, and the over-reclaim corrupts the global `tcp_memory_allocated` counter and memcg skmem accounting, breaking system-wide TCP memory limits (unbounded growth toward OOM, or permanent memory pressure across all TCP sockets). It is repeatable at will by an unauthenticated remote attacker."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/fe2c0bd6d1e29ccefdc978b9a290571c93c27473"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3d052cae566ec2285f5999958a5deb415a0f59e"
        },
        {
          "url": "https://git.kernel.org/stable/c/be7c61ea5f816168c38955eb4e898adc8b4b32fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f51f8c9d28954cf380100883a02eed35a8277e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d285eb9d0641c8344f2836081b4ccb7b3c5cc1b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/073d89808c065ac4c672c0a613a71b27a80691cb"
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      ],
      "title": "net: fix data-races around sk-\u003esk_forward_alloc",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53124",
    "datePublished": "2024-12-02T13:44:54.257Z",
    "dateReserved": "2024-11-19T17:17:24.995Z",
    "dateUpdated": "2026-08-05T11:43:54.069Z",
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        "title": "CISA ADP Vulnrichment"
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          "product": "Linux",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix possible UAF in sctp_v6_available()\n\nA lockdep report [1] with CONFIG_PROVE_RCU_LIST=y hints\nthat sctp_v6_available() is calling dev_get_by_index_rcu()\nand ipv6_chk_addr() without holding rcu.\n\n[1]\n =============================\n WARNING: suspicious RCU usage\n 6.12.0-rc5-virtme #1216 Tainted: G        W\n -----------------------------\n net/core/dev.c:876 RCU-list traversed in non-reader section!!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n 1 lock held by sctp_hello/31495:\n #0: ffff9f1ebbdb7418 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_bind (./arch/x86/include/asm/jump_label.h:27 net/sctp/socket.c:315) sctp\n\nstack backtrace:\n CPU: 7 UID: 0 PID: 31495 Comm: sctp_hello Tainted: G        W          6.12.0-rc5-virtme #1216\n Tainted: [W]=WARN\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n Call Trace:\n  \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:123)\n lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822)\n dev_get_by_index_rcu (net/core/dev.c:876 (discriminator 7))\n sctp_v6_available (net/sctp/ipv6.c:701) sctp\n sctp_do_bind (net/sctp/socket.c:400 (discriminator 1)) sctp\n sctp_bind (net/sctp/socket.c:320) sctp\n inet6_bind_sk (net/ipv6/af_inet6.c:465)\n ? security_socket_bind (security/security.c:4581 (discriminator 1))\n __sys_bind (net/socket.c:1848 net/socket.c:1869)\n ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340)\n ? do_user_addr_fault (./arch/x86/include/asm/preempt.h:84 (discriminator 13) ./include/linux/rcupdate.h:98 (discriminator 13) ./include/linux/rcupdate.h:882 (discriminator 13) ./include/linux/mm.h:729 (discriminator 13) arch/x86/mm/fault.c:1340 (discriminator 13))\n __x64_sys_bind (net/socket.c:1877 (discriminator 1) net/socket.c:1875 (discriminator 1) net/socket.c:1875 (discriminator 1))\n do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1))\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n RIP: 0033:0x7f59b934a1e7\n Code: 44 00 00 48 8b 15 39 8c 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb bd 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 31 00 00 00 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 8c 0c 00 f7 d8 64 89 01 48\nAll code\n========\n   0:\t44 00 00             \tadd    %r8b,(%rax)\n   3:\t48 8b 15 39 8c 0c 00 \tmov    0xc8c39(%rip),%rdx        # 0xc8c43\n   a:\tf7 d8                \tneg    %eax\n   c:\t64 89 02             \tmov    %eax,%fs:(%rdx)\n   f:\tb8 ff ff ff ff       \tmov    $0xffffffff,%eax\n  14:\teb bd                \tjmp    0xffffffffffffffd3\n  16:\t66 2e 0f 1f 84 00 00 \tcs nopw 0x0(%rax,%rax,1)\n  1d:\t00 00 00\n  20:\t0f 1f 00             \tnopl   (%rax)\n  23:\tb8 31 00 00 00       \tmov    $0x31,%eax\n  28:\t0f 05                \tsyscall\n  2a:*\t48 3d 01 f0 ff ff    \tcmp    $0xfffffffffffff001,%rax\t\t\u003c-- trapping instruction\n  30:\t73 01                \tjae    0x33\n  32:\tc3                   \tret\n  33:\t48 8b 0d 09 8c 0c 00 \tmov    0xc8c09(%rip),%rcx        # 0xc8c43\n  3a:\tf7 d8                \tneg    %eax\n  3c:\t64 89 01             \tmov    %eax,%fs:(%rcx)\n  3f:\t48                   \trex.W\n\nCode starting with the faulting instruction\n===========================================\n   0:\t48 3d 01 f0 ff ff    \tcmp    $0xfffffffffffff001,%rax\n   6:\t73 01                \tjae    0x9\n   8:\tc3                   \tret\n   9:\t48 8b 0d 09 8c 0c 00 \tmov    0xc8c09(%rip),%rcx        # 0xc8c19\n  10:\tf7 d8                \tneg    %eax\n  12:\t64 89 01             \tmov    %eax,%fs:(%rcx)\n  15:\t48                   \trex.W\n RSP: 002b:00007ffe2d0ad398 EFLAGS: 00000202 ORIG_RAX: 0000000000000031\n RAX: ffffffffffffffda RBX: 00007ffe2d0ad3d0 RCX: 00007f59b934a1e7\n RDX: 000000000000001c RSI: 00007ffe2d0ad3d0 RDI: 0000000000000005\n RBP: 0000000000000005 R08: 1999999999999999 R09: 0000000000000000\n R10: 00007f59b9253298 R11: 000000000000\n---truncated---"
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              "value": "AV:L - The vulnerable function is only reachable through the local `bind(2)` syscall or `SCTP_SOCKOPT_BINDX_ADD` setsockopt on an AF_INET6 SCTP socket; `available()` is not invoked from any packet-receive path, so no remote peer can trigger it.\nAC:L - The attacker controls both sides of the race \u2014 one thread spins on retryable failing `bind()` calls while another deletes/recreates the bound netdev in its own netns \u2014 and because no RCU read lock or preempt-disable is held, the task can be preempted inside the lookup-to-dereference window, widening it arbitrarily.\nPR:L - An unprivileged local user can obtain everything required via `unshare -Urn`, which grants CAP_NET_RAW for `SO_BINDTODEVICE` (to set `sk_bound_dev_if`) and CAP_NET_ADMIN to create and destroy the raced network device; no real root in the init namespace is needed.\nUI:N - The attacker drives the entire sequence \u2014 socket creation, device binding, bind loop and netdev teardown \u2014 from its own processes with no action by any other user.\nS:U - The use-after-free occurs in kernel memory and its impact stays within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `net_device` is dereferenced (`dev-\u003eifindex`, `dev-\u003epriv_flags`, `dev-\u003eadj_list.upper` \u2192 `upper-\u003emaster`/`upper-\u003edev`), and reallocating that slab slot with attacker-groomed data yields a controlled pointer dereference usable as a kernel memory read primitive.\nI:H - Use-after-free of a large, heap-sprayable `net_device` allocation lets the attacker place controlled data under the dangling pointer and steer subsequent kernel pointer chases, which is the standard basis for escalating to control-flow/data corruption; it also lets the bind-permission decision itself be falsified.\nA:H - Following a dangling `index_hlist.next` or dereferencing a stale `net_device`/`netdev_adjacent` pointer produces a wild read and kernel oops or panic, and the attacker can retrigger it in a loop."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix use-after-free in device_for_each_child()\n\nSyzbot has reported the following KASAN splat:\n\nBUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0\nRead of size 8 at addr ffff88801f605308 by task kbnepd bnep0/4980\n\nCPU: 0 UID: 0 PID: 4980 Comm: kbnepd bnep0 Not tainted 6.12.0-rc4-00161-gae90f6a6170d #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x100/0x190\n ? device_for_each_child+0x18f/0x1a0\n print_report+0x13a/0x4cb\n ? __virt_addr_valid+0x5e/0x590\n ? __phys_addr+0xc6/0x150\n ? device_for_each_child+0x18f/0x1a0\n kasan_report+0xda/0x110\n ? device_for_each_child+0x18f/0x1a0\n ? __pfx_dev_memalloc_noio+0x10/0x10\n device_for_each_child+0x18f/0x1a0\n ? __pfx_device_for_each_child+0x10/0x10\n pm_runtime_set_memalloc_noio+0xf2/0x180\n netdev_unregister_kobject+0x1ed/0x270\n unregister_netdevice_many_notify+0x123c/0x1d80\n ? __mutex_trylock_common+0xde/0x250\n ? __pfx_unregister_netdevice_many_notify+0x10/0x10\n ? trace_contention_end+0xe6/0x140\n ? __mutex_lock+0x4e7/0x8f0\n ? __pfx_lock_acquire.part.0+0x10/0x10\n ? rcu_is_watching+0x12/0xc0\n ? unregister_netdev+0x12/0x30\n unregister_netdevice_queue+0x30d/0x3f0\n ? __pfx_unregister_netdevice_queue+0x10/0x10\n ? __pfx_down_write+0x10/0x10\n unregister_netdev+0x1c/0x30\n bnep_session+0x1fb3/0x2ab0\n ? __pfx_bnep_session+0x10/0x10\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_woken_wake_function+0x10/0x10\n ? __kthread_parkme+0x132/0x200\n ? __pfx_bnep_session+0x10/0x10\n ? kthread+0x13a/0x370\n ? __pfx_bnep_session+0x10/0x10\n kthread+0x2b7/0x370\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x48/0x80\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nAllocated by task 4974:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n __kmalloc_noprof+0x1d1/0x440\n hci_alloc_dev_priv+0x1d/0x2820\n __vhci_create_device+0xef/0x7d0\n vhci_write+0x2c7/0x480\n vfs_write+0x6a0/0xfc0\n ksys_write+0x12f/0x260\n do_syscall_64+0xc7/0x250\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 4979:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x4f/0x70\n kfree+0x141/0x490\n hci_release_dev+0x4d9/0x600\n bt_host_release+0x6a/0xb0\n device_release+0xa4/0x240\n kobject_put+0x1ec/0x5a0\n put_device+0x1f/0x30\n vhci_release+0x81/0xf0\n __fput+0x3f6/0xb30\n task_work_run+0x151/0x250\n do_exit+0xa79/0x2c30\n do_group_exit+0xd5/0x2a0\n get_signal+0x1fcd/0x2210\n arch_do_signal_or_restart+0x93/0x780\n syscall_exit_to_user_mode+0x140/0x290\n do_syscall_64+0xd4/0x250\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nIn \u0027hci_conn_del_sysfs()\u0027, \u0027device_unregister()\u0027 may be called when\nan underlying (kobject) reference counter is greater than 1. This\nmeans that reparenting (happened when the device is actually freed)\nis delayed and, during that delay, parent controller device (hciX)\nmay be deleted. Since the latter may create a dangling pointer to\nfreed parent, avoid that scenario by reparenting to NULL explicitly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The UAF is reached through the Bluetooth stack: a BNEP session is established when an adjacent peer connects to PANU/NAP (set up automatically by the privileged BT daemon), and the faulting `unregister_netdev()` path in `bnep_session()` is entered when that remote peer drops the L2CAP/ACL link. Per kernel scoring guidance and repo precedent for BNEP/HIDP lifetime UAFs, Bluetooth reachability is Adjacent.\nAC:L - The attacker drives both halves of the lifetime race by repeatedly connecting and abruptly disconnecting, and connection teardown reliably reaches `hci_conn_del_sysfs()` with a non-rfcomm child still attached, leaving the dangling grandparent pointer every time. No condition depends on memory layout or state the attacker cannot influence.\nPR:N - The attacker is an unauthenticated adjacent Bluetooth device with no local account; the `capable(CAP_NET_ADMIN)` gate on `BNEPCONNADD` is satisfied by bluetoothd acting on the peer\u0027s behalf during normal PAN/HID service handling. This matches how the kernel CNA scored the comparable bnep/HIDP UAFs.\nUI:N - No victim action is needed \u2014 session teardown is triggered by the attacker\u0027s own disconnect, and controller unregistration occurs routinely via suspend/resume, USB dongle reset, firmware error recovery, or driver reload.\nS:U - The corrupted `hci_dev` object and the faulting code both live in the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `device_for_each_child()` dereferences `dev-\u003ep` and walks `klist_children` inside the freed `hci_dev` slab, so an attacker who reclaims and sprays that large kmalloc allocation can steer the traversal to read arbitrary kernel memory.\nI:H - The traversal is not read-only \u2014 `klist_iter_init()` takes `spin_lock(\u0026k-\u003ek_lock)` and `kref_get()` increments refcounts through pointers taken from the freed object, yielding attacker-influenced writes and a classic UAF heap-corruption primitive suitable for control-flow hijack.\nA:H - Confirmed by the syzbot KASAN slab-use-after-free report; dereferencing the freed `hci_dev` and walking a stale klist produces a kernel oops or lockup, remotely inducible by an adjacent peer."
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        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6894717a1ea363c5a27010ba604f957c309d282d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb91ce37dc9a37ea23cf32b6d7b667004e93d4c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9584c897d1cba6265c78010bbb45ca5722c88bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f67ca2a80acf8b207240405b7f72d660665d3df"
        },
        {
          "url": "https://git.kernel.org/stable/c/de5a44f351ca7efd9add9851b218f5353e2224b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/91e2a2e4d1336333804cd31162984f01ad8cc70f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b277bd569bb6a2777f0014f84b4344f444fd49d"
        },
        {
          "url": "https://git.kernel.org/stable/c/27aabf27fd014ae037cc179c61b0bee7cff55b3d"
        }
      ],
      "title": "Bluetooth: fix use-after-free in device_for_each_child()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53237",
    "datePublished": "2024-12-27T13:50:23.150Z",
    "dateReserved": "2024-11-19T17:17:25.026Z",
    "dateUpdated": "2026-08-05T11:44:47.756Z",
    "state": "PUBLISHED"
  },
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              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-56600",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T15:42:30.859070Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
          }
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        "problemTypes": [
          {
            "descriptions": [
              {
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                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
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        "providerMetadata": {
          "dateUpdated": "2025-02-11T15:45:24.168Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
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          "dateUpdated": "2025-11-03T20:50:38.144Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      }
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f2709d1271cfdf55c670ab5c5982139ab627ddc7",
              "status": "affected",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.4.287",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.231",
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            {
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              "status": "unaffected",
              "version": "5.15.174",
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            {
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              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
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        }
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          "nodes": [
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                  "vulnerable": true
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                {
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: inet6: do not leave a dangling sk pointer in inet6_create()\n\nsock_init_data() attaches the allocated sk pointer to the provided sock\nobject. If inet6_create() fails later, the sk object is released, but the\nsock object retains the dangling sk pointer, which may cause use-after-free\nlater.\n\nClear the sock sk pointer on error."
        }
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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through the local `socket(2)` syscall (`__sys_socket` \u2192 `__sock_create` \u2192 `inet6_create`), with no remote or network-peer input involved. No packet processing path reaches this function.\nAC:L - The failure path is deterministic, not a race: `socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6)` fails with -EACCES for any user outside the default-empty `ping_group_range`, and can be repeated in a tight loop to spray and reclaim the freed `struct sock` reliably.\nPR:L - Any unprivileged local user can trigger the dangling pointer \u2014 `ping_init_sock()` returning -EACCES is precisely the unprivileged case, and the `BPF_CGROUP_RUN_PROG_INET_SOCK` rejection path applies to ordinary confined services. No capability is needed, and the SOCK_RAW variant is reachable via `unshare -Urn`.\nUI:N - Exploitation is entirely driven by the attacker\u0027s own syscalls; no victim action or interaction is required.\nS:U - The freed object and the corrupted state are both kernel networking structures within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The use-after-free lets an attacker reclaim the freed `struct sock` slab object with controlled data while a live `struct socket` still references it, enabling disclosure of kernel memory \u2014 the upstream KASAN report shows exactly such a UAF read in `__sock_gen_cookie()`.\nI:H - Control over the contents of the reclaimed `struct sock` (including embedded function pointers and `sk_prot`/`sk_destruct` fields) that are later dereferenced through the stale `sock-\u003esk` yields an arbitrary-write / control-flow-hijack primitive, the standard outcome for a kernel UAF on a sprayable slab object.\nA:H - Dereferencing the freed socket causes a kernel oops or panic, and the trigger is repeatable at will by an unprivileged user, making it a reliable local denial of service."
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:45:20.668Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f2709d1271cfdf55c670ab5c5982139ab627ddc7"
        },
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          "url": "https://git.kernel.org/stable/c/35360255ca30776dee34d9fa764cffa24d0a5f65"
        },
        {
          "url": "https://git.kernel.org/stable/c/276a473c956fb55a6f3affa9ff232e10fffa7b43"
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          "url": "https://git.kernel.org/stable/c/79e16a0d339532ea832d85798eb036fc4f9e0cea"
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        {
          "url": "https://git.kernel.org/stable/c/9df99c395d0f55fb444ef39f4d6f194ca437d884"
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      "title": "net: inet6: do not leave a dangling sk pointer in inet6_create()",
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              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.66",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.5",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: initialize close_work early to avoid warning\n\nWe encountered a warning that close_work was canceled before\ninitialization.\n\n  WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0\n  Workqueue: events smc_lgr_terminate_work [smc]\n  RIP: 0010:__flush_work+0x19e/0x1b0\n  Call Trace:\n   ? __wake_up_common+0x7a/0x190\n   ? work_busy+0x80/0x80\n   __cancel_work_timer+0xe3/0x160\n   smc_close_cancel_work+0x1a/0x70 [smc]\n   smc_close_active_abort+0x207/0x360 [smc]\n   __smc_lgr_terminate.part.38+0xc8/0x180 [smc]\n   process_one_work+0x19e/0x340\n   worker_thread+0x30/0x370\n   ? process_one_work+0x340/0x340\n   kthread+0x117/0x130\n   ? __kthread_cancel_work+0x50/0x50\n   ret_from_fork+0x22/0x30\n\nThis is because when smc_close_cancel_work is triggered, e.g. the RDMA\ndriver is rmmod and the LGR is terminated, the conn-\u003eclose_work is\nflushed before initialization, resulting in WARN_ON(!work-\u003efunc).\n\n__smc_lgr_terminate             | smc_connect_{rdma|ism}\n-------------------------------------------------------------\n                                | smc_conn_create\n\t\t\t\t| \\- smc_lgr_register_conn\nfor conn in lgr-\u003econns_all      |\n\\- smc_conn_kill                |\n   \\- smc_close_active_abort    |\n      \\- smc_close_cancel_work  |\n         \\- cancel_work_sync    |\n            \\- __flush_work     |\n\t         (close_work)   |\n\t                        | smc_close_init\n\t                        | \\- INIT_WORK(\u0026close_work)\n\nSo fix this by initializing close_work before establishing the\nconnection."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The affected code is the SMC (Shared Memory Communications) protocol connect path, driven entirely by a remote peer\u0027s CLC/LLC messages, and the racing link-group teardown is itself triggerable by peer-sent LLC DELETE_LINK(ALL), LLC protocol violations, or a CLC DECLINE with the first-contact flag. No local access to the target is required for the attacking peer.\nAC:L - The remote peer controls both sides of the race \u2014 it dictates when the client executes smc_conn_create() by timing its CLC Accept reply, and it can force __smc_lgr_terminate() at will via an LLC DELETE_LINK ALL or protocol violation \u2014 and it can retry across the many connections an LGR multiplexes until the window is hit.\nPR:N - SMC performs no authentication of its own; a peer completing the ordinary TCP/CLC handshake needs no credentials or privileges on the target system. Locally, AF_SMC socket creation also has no capability check in smc_create()/__smc_create().\nUI:N - The condition is hit during normal, automatic SMC connection establishment and link-group termination handling; no victim action such as opening a file or mounting anything is needed.\nS:U - The warning and any resulting panic occur in the kernel\u0027s own SMC/workqueue context, with no crossing of a virtualization, IOMMU, or other security-authority boundary.\nC:N - __flush_work() returns immediately at WARN_ON(!work-\u003efunc) without dereferencing or exposing any data; there is no out-of-bounds read, uninitialized-memory disclosure, or pointer leak beyond the standard splat.\nI:N - No memory is corrupted \u2014 close_work is zero-initialized and was never queued, so the aborted cancel leaves no dangling state and provides no write primitive or control-flow influence.\nA:H - The WARN_ON is a kernel warning raised from the smc_lgr_terminate_work worker, which panics the system outright on the widely deployed panic_on_warn=1 configuration and can be triggered repeatedly by the peer, yielding a remote denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:45:40.041Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f0c37002210aaede10dae849d1a78efc2243add2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6638e52dcfafaf1b9cbc34544f0c832db0069ea1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0541db8ee32c09463a72d0987382b3a3336b0043"
        }
      ],
      "title": "net/smc: initialize close_work early to avoid warning",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56641",
    "datePublished": "2024-12-27T15:02:42.958Z",
    "dateReserved": "2024-12-27T15:00:39.839Z",
    "dateUpdated": "2026-08-05T11:45:40.041Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}