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        "title": "CISA ADP Vulnrichment"
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          "defaultStatus": "unaffected",
          "product": "Linux",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: bpf_local_storage: Always use bpf_mem_alloc in PREEMPT_RT\n\nIn PREEMPT_RT, kmalloc(GFP_ATOMIC) is still not safe in non preemptible\ncontext. bpf_mem_alloc must be used in PREEMPT_RT. This patch is\nto enforce bpf_mem_alloc in the bpf_local_storage when CONFIG_PREEMPT_RT\nis enabled.\n\n[   35.118559] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n[   35.118566] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1832, name: test_progs\n[   35.118569] preempt_count: 1, expected: 0\n[   35.118571] RCU nest depth: 1, expected: 1\n[   35.118577] INFO: lockdep is turned off.\n    ...\n[   35.118647]  __might_resched+0x433/0x5b0\n[   35.118677]  rt_spin_lock+0xc3/0x290\n[   35.118700]  ___slab_alloc+0x72/0xc40\n[   35.118723]  __kmalloc_noprof+0x13f/0x4e0\n[   35.118732]  bpf_map_kzalloc+0xe5/0x220\n[   35.118740]  bpf_selem_alloc+0x1d2/0x7b0\n[   35.118755]  bpf_local_storage_update+0x2fa/0x8b0\n[   35.118784]  bpf_sk_storage_get_tracing+0x15a/0x1d0\n[   35.118791]  bpf_prog_9a118d86fca78ebb_trace_inet_sock_set_state+0x44/0x66\n[   35.118795]  bpf_trace_run3+0x222/0x400\n[   35.118820]  __bpf_trace_inet_sock_set_state+0x11/0x20\n[   35.118824]  trace_inet_sock_set_state+0x112/0x130\n[   35.118830]  inet_sk_state_store+0x41/0x90\n[   35.118836]  tcp_set_state+0x3b3/0x640\n\nThere is no need to adjust the gfp_flags passing to the\nbpf_mem_cache_alloc_flags() which only honors the GFP_KERNEL.\nThe verifier has ensured GFP_KERNEL is passed only in sleepable context.\n\nIt has been an old issue since the first introduction of the\nbpf_local_storage ~5 years ago, so this patch targets the bpf-next.\n\nbpf_mem_alloc is needed to solve it, so the Fixes tag is set\nto the commit when bpf_mem_alloc was first used in the bpf_local_storage."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix deadlock when freeing cgroup storage\n\nThe following commit\nbc235cdb423a (\"bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]\")\nfirst introduced deadlock prevention for fentry/fexit programs attaching\non bpf_task_storage helpers. That commit also employed the logic in map\nfree path in its v6 version.\n\nLater bpf_cgrp_storage was first introduced in\nc4bcfb38a95e (\"bpf: Implement cgroup storage available to non-cgroup-attached bpf progs\")\nwhich faces the same issue as bpf_task_storage, instead of its busy\ncounter, NULL was passed to bpf_local_storage_map_free() which opened\na window to cause deadlock:\n\n\t\u003cTASK\u003e\n\t\t(acquiring local_storage-\u003elock)\n\t_raw_spin_lock_irqsave+0x3d/0x50\n\tbpf_local_storage_update+0xd1/0x460\n\tbpf_cgrp_storage_get+0x109/0x130\n\tbpf_prog_a4d4a370ba857314_cgrp_ptr+0x139/0x170\n\t? __bpf_prog_enter_recur+0x16/0x80\n\tbpf_trampoline_6442485186+0x43/0xa4\n\tcgroup_storage_ptr+0x9/0x20\n\t\t(holding local_storage-\u003elock)\n\tbpf_selem_unlink_storage_nolock.constprop.0+0x135/0x160\n\tbpf_selem_unlink_storage+0x6f/0x110\n\tbpf_local_storage_map_free+0xa2/0x110\n\tbpf_map_free_deferred+0x5b/0x90\n\tprocess_one_work+0x17c/0x390\n\tworker_thread+0x251/0x360\n\tkthread+0xd2/0x100\n\tret_from_fork+0x34/0x50\n\tret_from_fork_asm+0x1a/0x30\n\t\u003c/TASK\u003e\n\nProgs:\n - A: SEC(\"fentry/cgroup_storage_ptr\")\n   - cgid (BPF_MAP_TYPE_HASH)\n\tRecord the id of the cgroup the current task belonging\n\tto in this hash map, using the address of the cgroup\n\tas the map key.\n   - cgrpa (BPF_MAP_TYPE_CGRP_STORAGE)\n\tIf current task is a kworker, lookup the above hash\n\tmap using function parameter @owner as the key to get\n\tits corresponding cgroup id which is then used to get\n\ta trusted pointer to the cgroup through\n\tbpf_cgroup_from_id(). This trusted pointer can then\n\tbe passed to bpf_cgrp_storage_get() to finally trigger\n\tthe deadlock issue.\n - B: SEC(\"tp_btf/sys_enter\")\n   - cgrpb (BPF_MAP_TYPE_CGRP_STORAGE)\n\tThe only purpose of this prog is to fill Prog A\u0027s\n\thash map by calling bpf_cgrp_storage_get() for as\n\tmany userspace tasks as possible.\n\nSteps to reproduce:\n - Run A;\n - while (true) { Run B; Destroy B; }\n\nFix this issue by passing its busy counter to the free procedure so\nit can be properly incremented before storage/smap locking."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: consolidate suboption status\n\nMPTCP maintains the received sub-options status is the bitmask carrying\nthe received suboptions and in several bitfields carrying per suboption\nadditional info.\n\nZeroing the bitmask before parsing is not enough to ensure a consistent\nstatus, and the MPTCP code has to additionally clear some bitfiled\ndepending on the actually parsed suboption.\n\nThe above schema is fragile, and syzbot managed to trigger a path where\na relevant bitfield is not cleared/initialized:\n\n  BUG: KMSAN: uninit-value in __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n  BUG: KMSAN: uninit-value in mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n  BUG: KMSAN: uninit-value in ack_update_msk net/mptcp/options.c:1060 [inline]\n  BUG: KMSAN: uninit-value in mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n   __mptcp_expand_seq net/mptcp/options.c:1030 [inline]\n   mptcp_expand_seq net/mptcp/protocol.h:864 [inline]\n   ack_update_msk net/mptcp/options.c:1060 [inline]\n   mptcp_incoming_options+0x2036/0x3d30 net/mptcp/options.c:1209\n   tcp_data_queue+0xb4/0x7be0 net/ipv4/tcp_input.c:5233\n   tcp_rcv_established+0x1061/0x2510 net/ipv4/tcp_input.c:6264\n   tcp_v4_do_rcv+0x7f3/0x11a0 net/ipv4/tcp_ipv4.c:1916\n   tcp_v4_rcv+0x51df/0x5750 net/ipv4/tcp_ipv4.c:2351\n   ip_protocol_deliver_rcu+0x2a3/0x13d0 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233\n   NF_HOOK include/linux/netfilter.h:314 [inline]\n   ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254\n   dst_input include/net/dst.h:460 [inline]\n   ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447\n   NF_HOOK include/linux/netfilter.h:314 [inline]\n   ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567\n   __netif_receive_skb_one_core net/core/dev.c:5704 [inline]\n   __netif_receive_skb+0x319/0xa00 net/core/dev.c:5817\n   process_backlog+0x4ad/0xa50 net/core/dev.c:6149\n   __napi_poll+0xe7/0x980 net/core/dev.c:6902\n   napi_poll net/core/dev.c:6971 [inline]\n   net_rx_action+0xa5a/0x19b0 net/core/dev.c:7093\n   handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n   __do_softirq+0x14/0x1a kernel/softirq.c:595\n   do_softirq+0x9a/0x100 kernel/softirq.c:462\n   __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\n   local_bh_enable include/linux/bottom_half.h:33 [inline]\n   rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n   __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4493\n   dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n   neigh_hh_output include/net/neighbour.h:523 [inline]\n   neigh_output include/net/neighbour.h:537 [inline]\n   ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236\n   __ip_finish_output+0x287/0x810\n   ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324\n   NF_HOOK_COND include/linux/netfilter.h:303 [inline]\n   ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434\n   dst_output include/net/dst.h:450 [inline]\n   ip_local_out net/ipv4/ip_output.c:130 [inline]\n   __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536\n   ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550\n   __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1468\n   tcp_transmit_skb net/ipv4/tcp_output.c:1486 [inline]\n   tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2829\n   __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3012\n   tcp_send_fin+0x9f6/0xf50 net/ipv4/tcp_output.c:3618\n   __tcp_close+0x140c/0x1550 net/ipv4/tcp.c:3130\n   __mptcp_close_ssk+0x74e/0x16f0 net/mptcp/protocol.c:2496\n   mptcp_close_ssk+0x26b/0x2c0 net/mptcp/protocol.c:2550\n   mptcp_pm_nl_rm_addr_or_subflow+0x635/0xd10 net/mptcp/pm_netlink.c:889\n   mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:924 [inline]\n   mptcp_pm_flush_addrs_and_subflows net/mptcp/pm_netlink.c:1688 [inline]\n   mptcp_nl_flush_addrs_list net/mptcp/pm_netlink.c:1709 [inline]\n   mptcp_pm_nl_flush_addrs_doit+0xe10/0x1630 net/mptcp/pm_netlink.c:1750\n   genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]\n \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 vulnerable parser runs on TCP option bytes of received segments (`tcp_v4_rcv \u2192 tcp_data_queue \u2192 mptcp_incoming_options \u2192 mptcp_get_options`), so any remote MPTCP peer of an internet-facing MPTCP-enabled server or proxy can trigger it with crafted packets. No local access is involved at any point on the path.\nAC:L - The attacker fully controls the TCP option layout and can deterministically produce the MP_CAPABLE-with-data plus malformed-DSS combination that leaves `use_ack` set while `data_ack` is never populated; it is repeatable on every packet. Because the RX softirq reuses the same `mptcp_get_options()` stack frame, the attacker can also prime the uninitialized slot with a value of their choosing from a preceding packet.\nPR:N - The attacker is simply the remote endpoint of an MPTCP connection and needs no credentials, capabilities, or local account on the target; there is no authentication or authorization check between packet receive and `mptcp_incoming_options()`.\nUI:N - An MPTCP-enabled server (the primary MPTCP deployment: mobile-network gateways, proxies, load balancers, handset-facing services) processes the attacker\u0027s connection and crafted segments automatically in softirq context. No victim action is required.\nS:U - The uninitialized read, the corrupted state, and the resulting disclosure all remain within the kernel\u0027s own security authority on the affected host. No VM, sandbox, or IOMMU boundary is crossed.\nC:H - Uninitialized kernel stack memory is consumed as protocol state and, per the syzbot origin chain, propagates through `mptcp_pm_add_addr_signal()` into `mptcp_write_options()`\u0027s `put_unaligned_be32()` and out onto the wire to the remote peer. The leak is repeatable on every packet and every connection, so an attacker can harvest kernel stack contents (pointers, KASLR material, residual softirq data) without bound.\nI:H - The uninitialized/attacker-primed `data_ack` is written into `msk-\u003esnd_una`, `msk-\u003ewnd_end` and `msk-\u003ebytes_acked`, causing `__mptcp_clean_una()` to discard un-acknowledged application payload as if delivered, and uninitialized `data_fin`/`dsn64`/`data_seq` set `msk-\u003ercv_data_fin_seq` to a bogus value that forces a spurious EOF. This is uncontrolled modification of kernel connection state that silently corrupts and truncates the delivered data stream, plus corruption of socket memory accounting via `dfrag_uncharge()`.\nA:H - Corrupting `snd_una`/`wnd_end`/`rcv_data_fin_seq` from garbage stalls, aborts, or prevents termination of MPTCP connections, and the spurious sequence advance reaches the `WARN_ON_ONCE(!msk-\u003erecovery)` sites in `__mptcp_clean_una()`, which panics the box on kernels built with `panic_on_warn`. The condition is remotely triggerable at will and repeatable across connections."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:53:47.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3a7fda57b0f91f7ea34476b165f91a92feb17c96"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b5332d416d151a15742d1b16e7319368e3cc5c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f6c72b8ef8130760710e337dc8fbe7263954884"
        },
        {
          "url": "https://git.kernel.org/stable/c/6169e942370b4b6f9442d35c51519bf6c346843b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba0518f9e8688cd4fcb569e8df2a74874b4f3894"
        },
        {
          "url": "https://git.kernel.org/stable/c/c86b000782daba926c627d2fa00c3f60a75e7472"
        }
      ],
      "title": "mptcp: consolidate suboption status",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21707",
    "datePublished": "2025-02-27T02:07:21.084Z",
    "dateReserved": "2024-12-29T08:45:45.751Z",
    "dateUpdated": "2026-08-05T11:53:47.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}