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              "value": "AV:L - The bug is triggered only by writing the per-net sysctl net.sctp.auth_enable via /proc/sys (proc_sctp_do_auth); it is not reachable from SCTP packet receive, sockets, or other remote protocol paths.\nAC:L - An attacker can open the sysctl file, concurrently destroy the target network namespace, and repeatedly write during teardown; pernet exit destroys ctl_sock before unregistering sysctls, and the attacker controls both sides of that race.\nPR:L - Exploitation requires writing a mode 0644 sysctl in a network namespace; an unprivileged host user with CAP_NET_ADMIN via user namespaces can create a netns, become namespace root, and write net/sctp/auth_enable without init-namespace privileges.\nUI:N - No victim interaction is required beyond the attacker opening the sysctl and triggering namespace teardown in their own threads or processes.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross VM, container, or IOMMU boundaries by itself.\nC:H - proc_sctp_do_auth dereferences net-\u003esctp.ctl_sock after inet_ctl_sock_destroy; lock_sock and sctp_sk(sk)-\u003eep access freed socket/endpoint memory, a use-after-free that can disclose or infer heap contents.\nI:H - On a successful write, the handler sets sctp_sk(sk)-\u003eep-\u003eauth_enable on a freed endpoint object, giving a controlled heap write primitive that can be developed into arbitrary kernel modification or code execution.\nA:H - Use-after-free on the SCTP control socket/endpoint during sysctl processing can cause kernel oops/panic from lock_sock or ep access on freed memory, even when full exploitation is not attempted."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc-\u003enew_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc-\u003enew_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk-\u003etransport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport\u0027s state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n  Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n  Call Trace:\n   sctp_outq_select_transport+0x549/0x8b0 [sctp]\n   sctp_outq_flush+0x306/0x2c60 [sctp]\n   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n   sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n  Allocated by task 197:\n   sctp_transport_new+0x68/0x650 [sctp]\n   sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n   sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x77/0xb70\n   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n   sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport-\u003estate at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: svc: bound IBI payload to the requested max_payload_len\n\nsvc_i3c_master_handle_ibi() reads the IBI payload from the RX FIFO into\nthe IBI slot. The loop is bounded by the hardware FIFO size\n(SVC_I3C_FIFO_SIZE), not by the slot size.\n\nslot-\u003edata points into the IBI pool, which i3c_generic_ibi_alloc_pool()\nsizes at max_payload_len per slot. svc_i3c_master_request_ibi() only\nrejects a max_payload_len larger than SVC_I3C_FIFO_SIZE, so a driver can\nrequest a smaller one. mctp-i3c requests 1. Each readsb() then copies the\ncontroller RXCOUNT bytes (up to 31) with no check against the slot size.\nA device that sends more bytes than the slot holds writes past\nslot-\u003edata, an out-of-bounds write into the IBI pool.\n\nBound the loop by dev-\u003eibi-\u003emax_payload_len and clamp each read to the\nspace left in the slot, the same way dw-i3c does. A device can still send\nmore than the requested payload. Flush the leftover bytes from the RX FIFO\nso they do not leak into the next transfer."
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    "cveId": "CVE-2026-80951",
    "datePublished": "2026-09-11T19:42:21.115Z",
    "dateReserved": "2026-08-26T14:34:25.804Z",
    "dateUpdated": "2026-10-19T08:45:35.194Z",
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{
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    "cna": {
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        {
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          "product": "Linux",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link()\n\nsmc_llc_srv_add_link() keeps add_llc pointing into the queue entry:\n\n  add_llc = \u0026qentry-\u003emsg.add_link;\t\t\tsmc_llc.c:1482\n  ...\n  smc_llc_save_add_link_info(link_new, add_llc);\tsmc_llc.c:1494\n  smc_llc_flow_qentry_del(\u0026lgr-\u003ellc_flow_lcl);\t\tsmc_llc.c:1495\n  ...\n  u8 *llc_msg = smc_link_shared_v2_rxbuf(link) ?\n\t(u8 *)lgr-\u003ewr_rx_buf_v2 : (u8 *)add_llc;\tsmc_llc.c:1504\n  smc_llc_save_add_link_rkeys(link, link_new, llc_msg);\tsmc_llc.c:1506\n\nsmc_llc_flow_qentry_del() kfree()s the entry, so on a link without a shared\nv2 receive buffer the pointer handed to smc_llc_save_add_link_rkeys() is\nalready freed. Before the Fixes: commit that branch always used\nlgr-\u003ewr_rx_buf_v2 and add_llc was not used after the free.\n\nReproduced on an unpatched tree over rxe, with KASAN, kasan_multi_shot\nand a link forced to max_recv_sge == 1: the entry is freed and read by\nthe same call, and the freeing frame is smc_llc_srv_add_link() itself.\n\n  [    2.523161] BUG: KASAN: slab-use-after-free in smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523499] Read of size 2 at addr ffff8880052194de by task kworker/0:1/11\n  [    2.523789]\n  [    2.523862] CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.2.0-rc5-p0-g2c9dd296545d #35 PREEMPT(lazy)\n  [    2.523865] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n  [    2.523866] Workqueue: smc_hs_wq smc_listen_work\n  [    2.523869] Call Trace:\n  [    2.523870]  \u003cTASK\u003e\n  [    2.523871]  dump_stack_lvl+0x53/0x70\n  [    2.523872]  print_report+0xd0/0x630\n  [    2.523874]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n  [    2.523876]  ? smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523878]  kasan_report+0xce/0x100\n  [    2.523879]  ? smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523881]  smc_llc_save_add_link_rkeys+0x333/0x350\n  [    2.523883]  ? smcr_buf_reg_lgr+0x2a4/0x660\n  [    2.523885]  smc_llc_srv_add_link+0xaa2/0x1e50\n  [    2.523888]  ? _printk+0xba/0xf0\n  [    2.523897]  ? __pfx_smc_llc_srv_add_link+0x10/0x10\n  [    2.523899]  ? down_write+0xb0/0x130\n  [    2.523903]  ? __pfx_down_write+0x10/0x10\n  [    2.523905]  smc_listen_work+0x489e/0x4d00\n  [    2.523907]  ? kmem_cache_free+0x1c6/0x3a0\n  [    2.523911]  ? __pfx_smc_listen_work+0x10/0x10\n  [    2.523913]  ? release_sock+0x148/0x1d0\n  [    2.523915]  ? smc_tcp_listen_work+0xb4f/0xfc0\n  [    2.523917]  ? _raw_spin_lock_irq+0x80/0xe0\n  [    2.523918]  ? __pfx__raw_spin_lock_irq+0x10/0x10\n  [    2.523920]  process_one_work+0x633/0x1030\n  [    2.523922]  ? assign_work+0x11d/0x370\n  [    2.523924]  worker_thread+0x45b/0xd10\n  [    2.523926]  ? __pfx_worker_thread+0x10/0x10\n  [    2.523928]  ? __pfx_worker_thread+0x10/0x10\n  [    2.523929]  kthread+0x2c6/0x3b0\n  [    2.523931]  ? recalc_sigpending+0x15c/0x1e0\n  [    2.523934]  ? __pfx_kthread+0x10/0x10\n  [    2.523935]  ret_from_fork+0x36e/0x5a0\n  [    2.523937]  ? __pfx_ret_from_fork+0x10/0x10\n  [    2.523938]  ? __switch_to+0x572/0xdd0\n  [    2.523943]  ? __pfx_kthread+0x10/0x10\n  [    2.523944]  ret_from_fork_asm+0x1a/0x30\n  [    2.523947]  \u003c/TASK\u003e\n  [    2.523948]\n  [    2.531253] Allocated by task 48:\n  [    2.531399]  kasan_save_stack+0x33/0x60\n  [    2.531570]  kasan_save_track+0x14/0x30\n  [    2.531737]  __kasan_kmalloc+0x8f/0xa0\n  [    2.531905]  __kmalloc_cache_noprof+0x158/0x370\n  [    2.532100]  smc_llc_enqueue+0x72/0x560\n  [    2.532268]  smc_wr_rx_tasklet_fn+0x474/0xa80\n  [    2.532491]  tasklet_action_common+0x20f/0x8a0\n  [    2.532714]  handle_softirqs+0x18e/0x590\n  [    2.532886]  do_softirq+0x3b/0x60\n  [    2.533036]  __local_bh_enable_ip+0x61/0x70\n  [    2.533221]  __alloc_skb+0x732/0x890\n  [    2.533384]  rxe_init_packet+0x16b/0x4f0\n  [    2.533567]  prepare_ack_packet+0xb8/0x830\n  [    2.533760]  rxe_receiver+0x495/0x96e0\n  [    2.533933]  do_work+0x144/0x470\n  [    2\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",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The UAF is reached from smc_listen_work() (smc_listen_rdma_finish \u2192 smcr_serv_conf_first_link \u2192 smc_llc_srv_add_link) and from LLC ADD_LINK handling; CLC is plain TCP and SMC-Rv2/RoCEv2 LLC messages are IP-routable (UDP/4791), so a remote peer that can reach an AF_SMC listener drives the path.\nAC:L - The kfree of the LLC qentry and the later read in smc_llc_save_add_link_rkeys() run sequentially in the same call with no race; on an affected SMC-Rv2 link (max_recv_sge==1, the devices this bug exists for) a connecting peer that completes first-contact and replies to ADD_LINK triggers it reliably.\nPR:N - smc_listen_work() runs the CLC/LLC handshake after TCP accept and before accept() returns to userspace; SMC authenticates nothing, and smc_create()/smc_listen() enforce no capabilities, so an unauthenticated network peer needs only reachability to the listener.\nUI:N - The listen worker is queued automatically from smc_tcp_listen_work() for inbound connections; no local user action such as mounting a filesystem or opening a file is required.\nS:U - The use-after-free corrupts kernel heap state (the kmalloc-96 LLC qentry and link-group rtoken tables) within the same host kernel security authority; it is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - The dangling add_llc pointer is a use-after-free read of a freed kmalloc-96 qentry (KASAN: slab-use-after-free in smc_llc_save_add_link_rkeys); per kernel CNA guidance a UAF of a generic slab object enables arbitrary kernel memory disclosure via heap reuse.\nI:H - smc_ib_ready_link()/smcr_buf_reg_lgr() allocate between the free and the UAF, so the object can be sprayed; smc_llc_save_add_link_rkeys() then writes those bytes into lgr-\u003ertokens, a UAF-backed write primitive usable for arbitrary kernel modification or control-flow hijack.\nA:H - KASAN reports slab-use-after-free in smc_llc_save_add_link_rkeys() from smc_listen_work on smc_hs_wq; dereferencing freed heap from that kworker oopses or panics the kernel, and a remote peer can repeat the handshake at will."
            }
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        }
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      "providerMetadata": {
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        {
          "url": "https://git.kernel.org/stable/c/a42a459ef0e54cb0c4b3e43e21cb0e658e664f64"
        }
      ],
      "title": "net/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link()",
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    "cveId": "CVE-2026-80981",
    "datePublished": "2026-09-11T19:42:41.543Z",
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    "dateUpdated": "2026-10-19T08:46:05.740Z",
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