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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Serialize join and leave on copy_to_user failure\n\nrdma_join_multicast() queues RoCE work that later reads the ucma_multicast\nthrough event-\u003eparam.ud.private_data, then list_add()s the CMA multicast\nat the head of id_priv-\u003emc_list. rdma_leave_multicast() matches only by\nsockaddr and destroys the first hit.\n\nucma_process_join() used to drop ctx-\u003emutex after a successful join and\nretake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls\nwith the same address can therefore insert a second CMA entry before the\nfirst thread\u0027s leave. leave then cancels the newer work and the older\nworker still dereferences the ucma_multicast that the first thread frees.\n\nKeep ctx-\u003emutex held from rdma_join_multicast() through copy_to_user() and,\non -EFAULT, through rdma_leave_multicast() so leave cannot miss this join.\nDo not leave if join itself failed: that path never published this address\non mc_list, and a leave-by-addr would destroy an earlier successful join."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The bug is reached by write() of RDMA_USER_CM_CMD_JOIN_MCAST/JOIN_IP_MCAST on the local char device /dev/infiniband/rdma_cm into ucma_process_join(). The trigger is local: two racing joins and a bad response pointer. No remote peer supplies the data that causes it, so AV:L.\nAC:L - The attacker drives every part of the race. They make copy_to_user() fail with a bad cmd-\u003eresponse pointer, and a second thread issues JOIN_MCAST for the same address while ctx-\u003emutex is dropped. rdma_leave_multicast() then destroys the newer mc_list head and cancels the wrong iboe_join work. The attempt can be repeated until it wins.\nPR:L - rdma_cm is created with mode 0666 and ucma_write() does no capability check. Any local user on a host with a RoCE port can create a UD cm_id, bind it and join multicast. An unprivileged user cannot create a soft-RoCE device, because nldev NEWLINK needs CAP_NET_ADMIN in the initial namespace, so the RoCE port must already exist.\nUI:N - The attacker triggers the bug entirely through their own writes on an rdma_cm file descriptor they opened. No other user or administrator has to act.\nS:U - The freed ucma_multicast and the corrupted kernel heap are in the same kernel security authority. This is local kernel memory corruption, not a VM or IOMMU boundary crossing.\nC:H - cma_iboe_join_work_handler() calls ucma_create_uevent() on the freed ucma_multicast, reading mc-\u003euid and mc-\u003eid into the event that GET_EVENT copies to userspace. If the freed slot is reclaimed with sprayed objects, this use-after-free gives a read primitive.\nI:H - uevent-\u003emc keeps a pointer to the freed ucma_multicast, and ucma_get_event() then runs uevent-\u003emc-\u003eevents_reported++. That is an attacker-timed write into freed and reclaimable slab memory, usable to corrupt an object sprayed into the slot.\nA:H - The use-after-free of ucma_multicast in the RoCE join worker and in ucma_get_event() can corrupt the slab or oops the kernel, crashing the host. Syzbot reported this bug (extid a6ffe86390c8a6afc818)."
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        },
        {
          "url": "https://git.kernel.org/stable/c/662ade4de9ff5eceb0820a9f8e9fac70ba6a815b"
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      "title": "RDMA/ucma: Serialize join and leave on copy_to_user failure",
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    "dateUpdated": "2026-10-19T09:16:24.567Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: Cleanup POSIX timers right after de_thread()\n\nA per-thread CPU timer holds a reference to the PID of the thread it is\nattached to and, while it is armed, its node is queued in that thread\u0027s\nposix_cputimers. The task is looked up by that PID.\n\nWhen a non-leader thread exec()s, de_thread() changes which task owns\nthat PID. pid_task(timer-\u003eit.cpu.pid, PIDTYPE_PID) then returns NULL,\nbut the node is still queued on tsk, which is alive. timer_lock_sighand()\ntakes a failed lookup to mean that the node is already dequeued, so it\nhas nothing to undo.\n\nbegin_new_exec() calls posix_cpu_timers_exit(me) right after\nexec_task_namespaces() and that removes the leftover node, so the state\nnormally stays invisible. But bprm-\u003epoint_of_no_return is set before\nde_thread(), so if unshare_files(), set_mm_exe_file(), exec_mmap() or\nexec_task_namespaces() fails, the task dies before it gets there.\nexit_itimers() then frees the k_itimer while its node is still queued,\nand reaping tsk later erases that freed node from the rbtree.\n\nIn short:\n\n      the non-leader thread B           the parent\n\n  timer_create(CLOCK_THREAD_CPUTIME_ID)\n  timer_settime()\n    arm_timer()            // the node is queued on B\n  execve()\n    de_thread(B)\n      exchange_tids(B, leader)  // B\u0027s PID now belongs to the leader\n      release_task(leader)\n        __exit_signal(leader)\n          posix_cpu_timers_exit(leader)  // cleans leader\u0027s queue, not B\u0027s\n          __unhash_process(leader)  // that PID has no task anymore\n    exec_mmap()\n      mmap_read_lock_killable(old_mm)\n                                kill(B, SIGKILL)\n      // -EINTR\n  get_signal()\n    do_exit()\n      exit_itimers()\n        posix_timer_delete()\n          posix_cpu_timer_del()\n        posix_timer_unhash_and_free()  // freed while still queued\n                                wait4()\n                                  release_task(B)\n                                    posix_cpu_timers_exit(B)\n                                      cleanup_timerqueue()\n                                        timerqueue_del()  // use-after-free\n\nMove the POSIX timer cleanup right after de_thread() before any of the\nlater failure conditions brings the task into do_exit().\n\n[ tglx: Move the cleanup right after de_thread() ]"
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              "value": "AV:L - The bug needs local syscalls: timer_create(CLOCK_THREAD_CPUTIME_ID) and timer_settime() on a non-leader thread, then execve(). That thread\u0027s exec must fail after de_thread() in begin_new_exec() (e.g. exec_mmap() returning -EINTR on SIGKILL). No remote protocol carries any of this input.\nAC:L - The attacker controls both sides of the race. Their own parent sends SIGKILL while exec_mmap() waits on down_write_killable(exec_update_lock) or mmap_read_lock_killable(old_mm), and they can create that lock contention with their own CLONE_VM or /proc readers. No condition outside their control is needed.\nPR:L - Arming a thread CPU timer, calling execve and signalling one\u0027s own child are all available to any unprivileged user, with no capability checks on this path. A local unprivileged account is enough.\nUI:N - The attacker\u0027s own processes perform every step (timer arm, execve from a non-leader thread, SIGKILL, wait4 reap), so no victim action is needed.\nS:U - The memory corruption is inside the kernel that the attacker\u0027s process runs on. The outcome is a normal local privilege escalation, with no VM or sandbox boundary crossed.\nC:H - exit_itimers() frees the k_itimer while its cpu_timer node is still linked in the task\u0027s posix_cputimers rbtree. The freed slab object can be reclaimed with attacker-sprayed data, giving a use-after-free that can be turned into kernel memory disclosure.\nI:H - When release_task() reaps the task, posix_cpu_timers_exit() -\u003e cleanup_timerqueue() -\u003e timerqueue_del() calls rb_erase on the freed node and rewrites rbtree pointers in reclaimed memory. That is a use-after-free write which can be used for privilege escalation.\nA:H - The rbtree erase on freed memory corrupts kernel data and can oops or panic the kernel. Any unprivileged user can repeat it at will."
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          "url": "https://git.kernel.org/stable/c/acb03d3881818581052924a9bbbe92b8741ed448"
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      "title": "exec: Cleanup POSIX timers right after de_thread()",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Bound fragmented header copies by the remaining length\n\nsiw_get_hdr() can receive an extended DDP/RDMAP header across more than\none TCP callback. The first callback may receive most of the header,\nwhile the next one still limits the copy to hdrlen - MIN_DDP_HDR instead\nof the number of missing bytes. This makes the destination move past the\nend of the header and overwrite the receive state, including\nfpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd\nvalue as a copy offset, which creates an OOB write.\n\nUse the number of header bytes already received when calculating the\nnext copy length."
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            "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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            {
              "lang": "en",
              "value": "AV:N - The malformed input is the remote iWARP peer\u0027s own MPA/DDP/RDMAP header bytes on the siw TCP connection. The peer splits an extended header (e.g. RDMA Read Request, 44 bytes) across TCP segments, and siw_qp_llp_data_ready() -\u003e tcp_read_sock() -\u003e siw_tcp_rx_data() -\u003e siw_get_hdr() parses them. The transport is routable TCP.\nAC:L - The peer fully controls TCP segmentation, so it can deterministically end a segment with fpdu_part_rcvd between 16 and hdrlen. The next segment then copies hdrlen-16 bytes at that offset. No race or state outside the attacker\u0027s control is involved beyond siw serving an iWARP listener.\nPR:N - Once the MPA exchange puts the QP in RTS, siw_get_hdr() parses every incoming FPDU header, and neither MPA nor DDP authenticates the peer. ULP authorisation (such as an nvmet-rdma host NQN check) only arrives in messages parsed by this same path, so the overflow fires before any credential check.\nUI:N - No victim action is needed. The attacker connects to the iWARP service and sends crafted fragmented FPDUs, and siw processes them in its sk_data_ready callback.\nS:U - The corruption is confined to kernel memory of the host running siw (struct siw_qp and its neighbours). That is the same security authority as the vulnerable component, with no VM or IOMMU boundary crossed.\nC:H - The overflow writes peer bytes over siw_rx_stream fields after hdr, including fpdu_part_rcvd. A negative fpdu_part_rcvd then makes skb_copy_bits() write to c_hdr plus an attacker-chosen offset. A controlled kernel write like this can be turned into arbitrary kernel memory disclosure.\nI:H - siw_get_hdr() copies up to hdrlen-17 attacker bytes past srx-\u003ehdr (27 for rreq), overwriting the receive state. The next callback uses the corrupted negative fpdu_part_rcvd as the destination offset of skb_copy_bits(), giving an out-of-bounds kernel write whose offset and data are attacker-controlled.\nA:H - Corrupting fpdu_part_rcvd/fpdu_part_rem and writing out of bounds from siw_qp crashes or panics the kernel. A remote peer can repeat this on every connection."
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        "dateUpdated": "2026-10-19T09:17:33.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7"
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        {
          "url": "https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411"
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      "title": "RDMA/siw: Bound fragmented header copies by the remaining length",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98323",
    "datePublished": "2026-10-06T08:46:17.150Z",
    "dateReserved": "2026-09-25T10:25:14.340Z",
    "dateUpdated": "2026-10-19T09:17:33.779Z",
    "state": "PUBLISHED"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: wait for deferred control PDU completions before releasing the connection\n\nisert_send_done() hands ISTATE_SEND_TASKMGTRSP, ISTATE_SEND_REJECT and\nISTATE_SEND_TEXTRSP completions off to isert_comp_wq and returns.  The work\nitem then runs isert_completion_put() -\u003e isert_put_cmd(), which reads\nisert_conn-\u003econn and takes conn-\u003ecmd_lock.\n\nNothing orders that work item against teardown.  isert_wait_conn() queues\nisert_release_work, which frees isert_conn, and iscsit_close_connection()\nfrees the iscsit_conn right after it returns, so the queued work can run\nagainst freed memory.\n\nCount the deferred control PDU completions per connection and let\nisert_wait_conn() wait for them before the release work is queued.\n\nISTATE_SEND_LOGOUTRSP is deliberately not counted: that branch runs\niscsit_logout_post_handler(), which ends up waiting for\nconn-\u003econn_wait_comp, and that completion is only sent by\niscsit_close_connection() after it has called iscsit_wait_conn().\nWaiting for it here would deadlock.  Its wait stays the existing\nisert_wait4logout().\n\nThe splat below is from a kernel with tracing printk()s and an msleep(200)\ninjected into isert_do_control_comp() to widen the window:\n\n  BUG: KASAN: slab-use-after-free in isert_put_cmd+0x53d/0x620\n  Read of size 8 at addr ffff8881054f1038 by task kworker/u17:1/182\n\n  CPU: 0 UID: 0 PID: 182 Comm: kworker/u17:1 Tainted: G    B               7.2.0-rc5-TWIDE-gb8babf08acc7 #1 PREEMPT(lazy)\n  Tainted: [B]=BAD_PAGE\n  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  Workqueue: isert_comp_wq isert_do_control_comp\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x53/0x70\n   print_report+0xd0/0x630\n   ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n   ? _raw_spin_unlock_irqrestore+0x3e/0x70\n   ? isert_put_cmd+0x53d/0x620\n   kasan_report+0xce/0x100\n   ? isert_put_cmd+0x53d/0x620\n   isert_put_cmd+0x53d/0x620\n   ? isert_completion_put+0x305/0x330\n   ? isert_do_control_comp+0x2ef/0x310\n   process_one_work+0x633/0x1030\n   ? assign_work+0x11d/0x370\n   worker_thread+0x45b/0xd10\n   ? __pfx_worker_thread+0x10/0x10\n   ? __pfx_worker_thread+0x10/0x10\n   kthread+0x2c6/0x3b0\n   ? recalc_sigpending+0x15c/0x1e0\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork+0x36e/0x5a0\n   ? __pfx_ret_from_fork+0x10/0x10\n   ? __switch_to+0x572/0xdd0\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork_asm+0x1a/0x30\n   \u003c/TASK\u003e\n\n  Allocated by task 48:\n   kasan_save_stack+0x33/0x60\n   kasan_save_track+0x14/0x30\n   __kasan_kmalloc+0x8f/0xa0\n   __kmalloc_cache_noprof+0x158/0x370\n   isert_cma_handler+0x1e3/0x2ae0\n   cma_cm_event_handler+0x3e/0x240\n   cma_ib_req_handler+0x17d9/0x4490\n   cm_process_work+0x41/0x330\n   cm_work_handler+0x5727/0xc160\n   process_one_work+0x633/0x1030\n   worker_thread+0x45b/0xd10\n   kthread+0x2c6/0x3b0\n   ret_from_fork+0x36e/0x5a0\n   ret_from_fork_asm+0x1a/0x30\n\n  Freed by task 184:\n   kasan_save_stack+0x33/0x60\n   kasan_save_track+0x14/0x30\n   kasan_save_free_info+0x3b/0x60\n   __kasan_slab_free+0x43/0x70\n   kfree+0x121/0x380\n   iscsit_close_connection+0x7cf/0x1e60\n   iscsit_take_action_for_connection_exit+0x1b6/0x360\n   iscsi_target_tx_thread+0x472/0x690\n   kthread+0x2c6/0x3b0\n   ret_from_fork+0x36e/0x5a0\n   ret_from_fork_asm+0x1a/0x30"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The iSER initiator triggers it remotely over RDMA (iWARP/RoCEv2 are IP-routable). Its iSCSI Text Request (or a TMF or a malformed PDU that draws a Reject) makes isert_send_done() queue isert_do_control_comp(); an RDMA CM disconnect from the same initiator then starts teardown via iscsit_close_connection().\nAC:H - The attacker sends both the request and the disconnect, but the free only wins if the already-queued isert_comp_wq work stays delayed through ib_drain_qp, isert_wait4cmds and the release work. The attacker can\u0027t control that scheduling; the reporter needed an injected msleep(200) to reproduce it.\nPR:N - The attacker only needs a full-feature iSCSI session, and LIO allows login with AuthMethod=None, where the initiator IQN is merely asserted. No credentials are checked before the Text/TMF/Reject paths that queue the deferred completion.\nUI:N - The initiator triggers the response PDU and the connection teardown entirely through its own iSCSI PDUs and RDMA CM disconnect; no action by a target administrator is needed.\nS:U - The use-after-free is in the target host\u0027s own kernel memory (isert_conn and iscsit_conn), so the impact stays within the same kernel security authority.\nC:H - isert_put_cmd() dereferences the freed isert_conn-\u003econn and reads the freed iscsit_conn and cmd structures. Reclaiming those slab objects lets attacker-shaped data steer kernel pointer reads.\nI:H - On the freed iscsit_conn, isert_put_cmd() takes spin_lock_bh(\u0026conn-\u003ecmd_lock), runs list_del_init(\u0026cmd-\u003ei_conn_node) and calls iscsit_release_cmd()/transport_generic_free_cmd(). These are writes and frees through freed memory, which can corrupt the heap.\nA:H - The isert_comp_wq worker hits a slab use-after-free in isert_put_cmd() (KASAN splat in the fix commit), which on production kernels can crash or oops the iSCSI target host."
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f5613acbe2e346d5c466ef0bd264fca936b69f82"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccdb1523f12bc8a9646de65055d1aafed9e9bcc6"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e230917670c6e6fe3243abfa11299fcbe05b1f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/505b242d9351690d1385bbe508ab4666f60363ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/7edb8a88d6c76237c8b4435765bee1009e26a50a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b96b8b3e41c308f606ffd10cfef1a7b9f97414cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7908fbc597a694bbd99bfb59ece73bc3daded68e"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8fe3dfce8c0d8a76dc3d8486a5bff5feebe156f"
        }
      ],
      "title": "IB/isert: wait for deferred control PDU completions before releasing the connection",
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98357",
    "datePublished": "2026-10-06T08:46:44.216Z",
    "dateReserved": "2026-09-25T10:25:14.344Z",
    "dateUpdated": "2026-10-19T09:18:07.886Z",
    "state": "PUBLISHED"
  },
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/verbs.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "be4b44c8b47c67a04c08b1a0aba18006b749ae6a",
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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          "nodes": [
            {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Reject unregistering netdevs in ib_get_eth_speed\n\nib_device_get_netdev() intentionally returns a referenced net_device even\nwhen it is unregistering, so matching and cleanup callers can still find\nthe association. The reference keeps struct net_device allocated, but does\nnot guarantee that the device remains operational.\n\nib_get_eth_speed() uses the returned device operationally by invoking its\nethtool callback. Although that call is made under RTNL, the function does\nnot verify the registration state first. An asynchronous RDMA port query\ncan therefore call into a netdev after NETDEV_UNREGISTER and ndo_uninit\nhave completed.\n\nCheck for NETREG_REGISTERED while holding RTNL and return -ENODEV for a\ndevice which is being unregistered. Keeping RTNL across the check and the\nethtool operation prevents unregister from starting between them.\n\nKeep the speed fallback and warning under RTNL as well, so the warning can\nsafely read netdev-\u003ename. Drop the netdev reference before releasing RTNL\nonce all accesses to the device are complete."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - ib_get_eth_speed() is reached via ib_query_port() -\u003e driver query_port (rxe_query_port, siw_query_port, irdma, bnxt_re, hns, mana, erdma...) from local uverbs QUERY_PORT ioctls on /dev/infiniband/uverbs*, RDMA_NLDEV_CMD_PORT_GET netlink or the ib cache work; no remote peer supplies data to this path.\nAC:H - The faulty call needs the port\u0027s bound netdev to be between NETDEV_UNREGISTER/ndo_uninit and the queued ib_unregister_device_queued() teardown. The querying user can hammer query_port, but unregistering that netdev is an admin or driver action they cannot arrange on demand.\nPR:L - The query side needs no capability: RDMA_NLDEV_CMD_PORT_GET has no RDMA_NL_ADMIN_PERM flag, and uverbs query_port only needs an open uverbs device. Binding rxe/siw via RDMA_NLDEV_CMD_NEWLINK needs init-ns CAP_NET_ADMIN, so the attacker relies on an existing RoCE/iWARP port.\nUI:N - No victim action is needed. The attacker only issues port queries, and the unregister event is a system state change (counted under AC:H), not a user being tricked into doing something.\nS:U - The bug and its impact are both in the host kernel. No VM, IOMMU or sandbox boundary is crossed.\nC:H - __ethtool_get_link_ksettings() runs on a netdev whose ndo_uninit has already run. For example, ipvlan_ethtool_get_link_ksettings() dereferences ipvlan-\u003ephy_dev after ipvlan_port_put() dropped the port\u0027s phy_dev reference, which lets freed net_device memory be read.\nI:H - The stale or freed lower net_device is used to load and call ethtool_ops-\u003eget_link_ksettings through a function pointer. A use-after-free that reaches an indirect call can be groomed toward control-flow hijack.\nA:H - syzbot hit this as a kernel crash. Calling ethtool callbacks on a torn-down device (freed pcpu/port state in macvlan/ipvlan/team uninit) oopses the kernel."
            }
          ]
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/be4b44c8b47c67a04c08b1a0aba18006b749ae6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/45c60ffc79771bad154f224a05753191cf1b37bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/520cd057f138ed8dbe8e05f0eae3a8ed4c5d3a5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/a219459fbd1b2598e63c81a52847eba6c28b72d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/5bd42f74ec3b4f4687fb600f367af0828d513b3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef9fbe1b93f3b617b96e86d5cd76b3fa44514cb5"
        }
      ],
      "title": "RDMA/core: Reject unregistering netdevs in ib_get_eth_speed",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98359",
    "datePublished": "2026-10-06T08:46:45.938Z",
    "dateReserved": "2026-09-25T10:25:14.344Z",
    "dateUpdated": "2026-10-19T09:18:09.934Z",
    "state": "PUBLISHED"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: free inet_opt and ireq_opt after an RCU grace period\n\ntcp_v4_syn_recv_sock() transfers ownership of ireq-\u003eireq_opt to the\nchild socket (newinet-\u003einet_opt) without copying it.\n\nAnother cpu can concurrently process a retransmitted SYN for the same\nrequest socket, and send a SYNACK from tcp_check_req().\ntcp_v4_send_synack() and inet_csk_route_req() read ireq-\u003eireq_opt\nunder rcu_read_lock() only, and ip_build_and_send_pkt() and\nip_options_build() then read opt-\u003eoptlen twice.\n\nNote that the SYNACK timer itself is not an issue: it holds a\nreference on its request socket, and inet_csk_reqsk_queue_drop()\ncalls timer_delete_sync() before the child can be freed.\n\nSince commit 079096f103fa (\"tcp/dccp: install syn_recv requests\ninto ehash table\"), request sockets are processed without holding\nthe listener lock, so nothing prevents the child socket from being\nfreed while the SYNACK is still being built. TCP child sockets do\nnot have SOCK_RCU_FREE, and inet_sock_destruct() frees inet_opt\nwith a plain kfree(), leading to a use-after-free in\nip_options_build().\n\nA similar issue exists with request socket migration\n(net.ipv4.tcp_migrate_req=1, or a BPF_SK_REUSEPORT_SELECT_OR_MIGRATE\nprogram). reqsk_timer_handler() clones the request socket with\ninet_reqsk_clone(), so that the old request socket and its clone\nshare the same ireq_opt, then reqsk_migrate_reset() clears the\npointer in the old one. Another cpu holding a reference on the old\nrequest socket can still be using these options (sending a SYNACK,\nor creating a child in tcp_v4_syn_recv_sock()) when the clone is\nfreed, and tcp_v4_reqsk_destructor() also uses a plain kfree().\n\nReaders already use RCU, and other paths replacing inet_opt\n(do_ip_setsockopt(), cipso_v4_sock_setattr()...) already use\nkfree_rcu(). Use kfree_rcu() in inet_sock_destruct() and\ntcp_v4_reqsk_destructor() as well.\n\nIPv6 is not affected by the first issue, because tcp_v6_syn_recv_sock()\nduplicates the options. tcp_v6_reqsk_destructor() has the same\nmigration issue with ipv6_opt, which is only set by CALIPSO. This\nwill be addressed in a separate patch."
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