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            },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix a suspicious RCU usage warning\n\nI received the following warning while running cthon against an ontap\nserver running pNFS:\n\n[   57.202521] =============================\n[   57.202522] WARNING: suspicious RCU usage\n[   57.202523] 6.7.0-rc3-g2cc14f52aeb7 #41492 Not tainted\n[   57.202525] -----------------------------\n[   57.202525] net/sunrpc/xprtmultipath.c:349 RCU-list traversed in non-reader section!!\n[   57.202527]\n               other info that might help us debug this:\n\n[   57.202528]\n               rcu_scheduler_active = 2, debug_locks = 1\n[   57.202529] no locks held by test5/3567.\n[   57.202530]\n               stack backtrace:\n[   57.202532] CPU: 0 PID: 3567 Comm: test5 Not tainted 6.7.0-rc3-g2cc14f52aeb7 #41492 5b09971b4965c0aceba19f3eea324a4a806e227e\n[   57.202534] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 2/2/2022\n[   57.202536] Call Trace:\n[   57.202537]  \u003cTASK\u003e\n[   57.202540]  dump_stack_lvl+0x77/0xb0\n[   57.202551]  lockdep_rcu_suspicious+0x154/0x1a0\n[   57.202556]  rpc_xprt_switch_has_addr+0x17c/0x190 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6]\n[   57.202596]  rpc_clnt_setup_test_and_add_xprt+0x50/0x180 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6]\n[   57.202621]  ? rpc_clnt_add_xprt+0x254/0x300 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6]\n[   57.202646]  rpc_clnt_add_xprt+0x27a/0x300 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6]\n[   57.202671]  ? __pfx_rpc_clnt_setup_test_and_add_xprt+0x10/0x10 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6]\n[   57.202696]  nfs4_pnfs_ds_connect+0x345/0x760 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9]\n[   57.202728]  ? __pfx_nfs4_test_session_trunk+0x10/0x10 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9]\n[   57.202754]  nfs4_fl_prepare_ds+0x75/0xc0 [nfs_layout_nfsv41_files e3a4187f18ae8a27b630f9feae6831b584a9360a]\n[   57.202760]  filelayout_write_pagelist+0x4a/0x200 [nfs_layout_nfsv41_files e3a4187f18ae8a27b630f9feae6831b584a9360a]\n[   57.202765]  pnfs_generic_pg_writepages+0xbe/0x230 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9]\n[   57.202788]  __nfs_pageio_add_request+0x3fd/0x520 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202813]  nfs_pageio_add_request+0x18b/0x390 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202831]  nfs_do_writepage+0x116/0x1e0 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202849]  nfs_writepages_callback+0x13/0x30 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202866]  write_cache_pages+0x265/0x450\n[   57.202870]  ? __pfx_nfs_writepages_callback+0x10/0x10 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202891]  nfs_writepages+0x141/0x230 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202913]  do_writepages+0xd2/0x230\n[   57.202917]  ? filemap_fdatawrite_wbc+0x5c/0x80\n[   57.202921]  filemap_fdatawrite_wbc+0x67/0x80\n[   57.202924]  filemap_write_and_wait_range+0xd9/0x170\n[   57.202930]  nfs_wb_all+0x49/0x180 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902]\n[   57.202947]  nfs4_file_flush+0x72/0xb0 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9]\n[   57.202969]  __se_sys_close+0x46/0xd0\n[   57.202972]  do_syscall_64+0x68/0x100\n[   57.202975]  ? do_syscall_64+0x77/0x100\n[   57.202976]  ? do_syscall_64+0x77/0x100\n[   57.202979]  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[   57.202982] RIP: 0033:0x7fe2b12e4a94\n[   57.202985] Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 80 3d d5 18 0e 00 00 74 13 b8 03 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 44 c3 0f 1f 00 48 83 ec 18 89 7c 24 0c e8 c3\n[   57.202987] RSP: 002b:00007ffe857ddb38 EFLAGS: 00000202 ORIG_RAX: 0000000000000003\n[   57.202989] RAX: ffffffffffffffda RBX: 00007ffe857dfd68 RCX: 00007fe2b12e4a94\n[   57.202991] RDX: 0000000000002000 RSI: 00007ffe857ddc40 RDI: 0000000000000003\n[   57.202992] RBP: 00007ffe857dfc50 R08: 7fffffffffffffff R09: 0000000065650f49\n[   57.202993] R10: 00007f\n---truncated---"
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              "value": "AV:L - The vulnerable path runs in the NFS/SUNRPC client during pNFS DS connect and session trunking (`rpc_clnt_setup_test_and_add_xprt` / `rpc_clnt_test_and_add_xprt`), reached via local file operations on an NFS mount (e.g. writeback/close), not via an unauthenticated remote service like nfsd/ksmbd.\nAC:L - An attacker who can drive multipath/trunking I/O also influences transport add and remove (failed trunking calls `rpc_clnt_xprt_switch_remove_xprt`; connection failure paths delete xprts), so both sides of the RCU list race are attacker-driven rather than depending on an uncontrolled external condition.\nPR:L - Triggering requires only an unprivileged process with access to an already-mounted NFSv4.1/pNFS share (common on HPC/enterprise clients); mounting may need admin, but exploitation itself does not require init-namespace root or capabilities beyond a normal user on the mount.\nUI:N - The attacker triggers the buggy has_addr walk through their own reads/writes/closes on the NFS mount; no separate victim action is required once the share is available.\nS:U - Impact is a host-kernel use-after-free of `rpc_xprt` within the same security authority; there is no VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Missing RCU read-side protection while iterating an RCU list whose entries are removed with `list_del_rcu` and freed with `kfree_rcu` yields a classic slab UAF; reclaim of the freed `rpc_xprt` enables disclosure of kernel heap contents (the walk reads `pos-\u003eaddr` and `address_strings`).\nI:H - The same UAF on `rpc_xprt` is heap-sprayable to obtain attacker-controlled object contents and corruption/control-flow hijack primitives, consistent with scoring other kernel UAFs as High integrity.\nA:H - Use-after-free or wild dereference during the unlocked RCU-list walk can oops/panic the kernel, and CONFIG_PROVE_RCU builds also WARN on the missing lock (panic_on_warn converts that to DoS)."
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                  "versionEndExcluding": "6.6.66",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.5",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix OOB devmap writes when deleting elements\n\nJordy reported issue against XSKMAP which also applies to DEVMAP - the\nindex used for accessing map entry, due to being a signed integer,\ncauses the OOB writes. Fix is simple as changing the type from int to\nu32, however, when compared to XSKMAP case, one more thing needs to be\naddressed.\n\nWhen map is released from system via dev_map_free(), we iterate through\nall of the entries and an iterator variable is also an int, which\nimplies OOB accesses. Again, change it to be u32.\n\nExample splat below:\n\n[  160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000\n[  160.731662] #PF: supervisor read access in kernel mode\n[  160.736876] #PF: error_code(0x0000) - not-present page\n[  160.742095] PGD 0 P4D 0\n[  160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP\n[  160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487\n[  160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[  160.767642] Workqueue: events_unbound bpf_map_free_deferred\n[  160.773308] RIP: 0010:dev_map_free+0x77/0x170\n[  160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 \u003c48\u003e 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff\n[  160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202\n[  160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024\n[  160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000\n[  160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001\n[  160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122\n[  160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000\n[  160.838310] FS:  0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000\n[  160.846528] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0\n[  160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  160.874092] PKRU: 55555554\n[  160.876847] Call Trace:\n[  160.879338]  \u003cTASK\u003e\n[  160.881477]  ? __die+0x20/0x60\n[  160.884586]  ? page_fault_oops+0x15a/0x450\n[  160.888746]  ? search_extable+0x22/0x30\n[  160.892647]  ? search_bpf_extables+0x5f/0x80\n[  160.896988]  ? exc_page_fault+0xa9/0x140\n[  160.900973]  ? asm_exc_page_fault+0x22/0x30\n[  160.905232]  ? dev_map_free+0x77/0x170\n[  160.909043]  ? dev_map_free+0x58/0x170\n[  160.912857]  bpf_map_free_deferred+0x51/0x90\n[  160.917196]  process_one_work+0x142/0x370\n[  160.921272]  worker_thread+0x29e/0x3b0\n[  160.925082]  ? rescuer_thread+0x4b0/0x4b0\n[  160.929157]  kthread+0xd4/0x110\n[  160.932355]  ? kthread_park+0x80/0x80\n[  160.936079]  ret_from_fork+0x2d/0x50\n[  160.943396]  ? kthread_park+0x80/0x80\n[  160.950803]  ret_from_fork_asm+0x11/0x20\n[  160.958482]  \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:55:53.439Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f170e91d3063ca60baec4bd9f544faf3bfe29eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/70f3de869865f9c3da0508a5ea29f6f4c1889057"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad34306ac6836e5dd096b7d0ad4aa20cb7c8d9e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/98c03d05936d846073df8f550e9e8bf0dde1d77f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e858930695d3ebec423e85384c95427258c294f"
        },
        {
          "url": "https://git.kernel.org/stable/c/178e31df1fb3d9e0890eb471da16709cbc82edee"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab244dd7cf4c291f82faacdc50b45cc0f55b674d"
        }
      ],
      "title": "bpf: fix OOB devmap writes when deleting elements",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56615",
    "datePublished": "2024-12-27T14:51:20.206Z",
    "dateReserved": "2024-12-27T14:03:06.014Z",
    "dateUpdated": "2026-05-11T20:55:53.439Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}