CVE-2025-68285 (GCVE-0-2025-68285)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-01-02 15:34
VLAI?
Title
libceph: fix potential use-after-free in have_mon_and_osd_map()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: fix potential use-after-free in have_mon_and_osd_map() The wait loop in __ceph_open_session() can race with the client receiving a new monmap or osdmap shortly after the initial map is received. Both ceph_monc_handle_map() and handle_one_map() install a new map immediately after freeing the old one kfree(monc->monmap); monc->monmap = monmap; ceph_osdmap_destroy(osdc->osdmap); osdc->osdmap = newmap; under client->monc.mutex and client->osdc.lock respectively, but because neither is taken in have_mon_and_osd_map() it's possible for client->monc.monmap->epoch and client->osdc.osdmap->epoch arms in client->monc.monmap && client->monc.monmap->epoch && client->osdc.osdmap && client->osdc.osdmap->epoch; condition to dereference an already freed map. This happens to be reproducible with generic/395 and generic/397 with KASAN enabled: BUG: KASAN: slab-use-after-free in have_mon_and_osd_map+0x56/0x70 Read of size 4 at addr ffff88811012d810 by task mount.ceph/13305 CPU: 2 UID: 0 PID: 13305 Comm: mount.ceph Not tainted 6.14.0-rc2-build2+ #1266 ... Call Trace: <TASK> have_mon_and_osd_map+0x56/0x70 ceph_open_session+0x182/0x290 ceph_get_tree+0x333/0x680 vfs_get_tree+0x49/0x180 do_new_mount+0x1a3/0x2d0 path_mount+0x6dd/0x730 do_mount+0x99/0xe0 __do_sys_mount+0x141/0x180 do_syscall_64+0x9f/0x100 entry_SYSCALL_64_after_hwframe+0x76/0x7e </TASK> Allocated by task 13305: ceph_osdmap_alloc+0x16/0x130 ceph_osdc_init+0x27a/0x4c0 ceph_create_client+0x153/0x190 create_fs_client+0x50/0x2a0 ceph_get_tree+0xff/0x680 vfs_get_tree+0x49/0x180 do_new_mount+0x1a3/0x2d0 path_mount+0x6dd/0x730 do_mount+0x99/0xe0 __do_sys_mount+0x141/0x180 do_syscall_64+0x9f/0x100 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 9475: kfree+0x212/0x290 handle_one_map+0x23c/0x3b0 ceph_osdc_handle_map+0x3c9/0x590 mon_dispatch+0x655/0x6f0 ceph_con_process_message+0xc3/0xe0 ceph_con_v1_try_read+0x614/0x760 ceph_con_workfn+0x2de/0x650 process_one_work+0x486/0x7c0 process_scheduled_works+0x73/0x90 worker_thread+0x1c8/0x2a0 kthread+0x2ec/0x300 ret_from_fork+0x24/0x40 ret_from_fork_asm+0x1a/0x30 Rewrite the wait loop to check the above condition directly with client->monc.mutex and client->osdc.lock taken as appropriate. While at it, improve the timeout handling (previously mount_timeout could be exceeded in case wait_event_interruptible_timeout() slept more than once) and access client->auth_err under client->monc.mutex to match how it's set in finish_auth(). monmap_show() and osdmap_show() now take the respective lock before accessing the map as well.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < bb4910c5fd436701faf367e1b5476a5a6d2aff1c (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < 05ec43e9a9de67132dc8cd3b22afef001574947f (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < 7c8ccdc1714d9fabecd26e1be7db1771061acc6e (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < 183ad6e3b651e8fb0b66d6a2678f4b80bfbba092 (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < e08021b3b56b2407f37b5fe47b654be80cc665fb (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < 3fc43120b22a3d4f1fbeff56a35ce2105b6a5683 (git)
Affected: 6822d00b5462e7a9dfa11dcc60cc25823a2107c5 , < 076381c261374c587700b3accf410bdd2dba334e (git)
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    Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix potential use-after-free in have_mon_and_osd_map()\n\nThe wait loop in __ceph_open_session() can race with the client\nreceiving a new monmap or osdmap shortly after the initial map is\nreceived.  Both ceph_monc_handle_map() and handle_one_map() install\na new map immediately after freeing the old one\n\n    kfree(monc-\u003emonmap);\n    monc-\u003emonmap = monmap;\n\n    ceph_osdmap_destroy(osdc-\u003eosdmap);\n    osdc-\u003eosdmap = newmap;\n\nunder client-\u003emonc.mutex and client-\u003eosdc.lock respectively, but\nbecause neither is taken in have_mon_and_osd_map() it\u0027s possible for\nclient-\u003emonc.monmap-\u003eepoch and client-\u003eosdc.osdmap-\u003eepoch arms in\n\n    client-\u003emonc.monmap \u0026\u0026 client-\u003emonc.monmap-\u003eepoch \u0026\u0026\n        client-\u003eosdc.osdmap \u0026\u0026 client-\u003eosdc.osdmap-\u003eepoch;\n\ncondition to dereference an already freed map.  This happens to be\nreproducible with generic/395 and generic/397 with KASAN enabled:\n\n    BUG: KASAN: slab-use-after-free in have_mon_and_osd_map+0x56/0x70\n    Read of size 4 at addr ffff88811012d810 by task mount.ceph/13305\n    CPU: 2 UID: 0 PID: 13305 Comm: mount.ceph Not tainted 6.14.0-rc2-build2+ #1266\n    ...\n    Call Trace:\n    \u003cTASK\u003e\n    have_mon_and_osd_map+0x56/0x70\n    ceph_open_session+0x182/0x290\n    ceph_get_tree+0x333/0x680\n    vfs_get_tree+0x49/0x180\n    do_new_mount+0x1a3/0x2d0\n    path_mount+0x6dd/0x730\n    do_mount+0x99/0xe0\n    __do_sys_mount+0x141/0x180\n    do_syscall_64+0x9f/0x100\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n    \u003c/TASK\u003e\n\n    Allocated by task 13305:\n    ceph_osdmap_alloc+0x16/0x130\n    ceph_osdc_init+0x27a/0x4c0\n    ceph_create_client+0x153/0x190\n    create_fs_client+0x50/0x2a0\n    ceph_get_tree+0xff/0x680\n    vfs_get_tree+0x49/0x180\n    do_new_mount+0x1a3/0x2d0\n    path_mount+0x6dd/0x730\n    do_mount+0x99/0xe0\n    __do_sys_mount+0x141/0x180\n    do_syscall_64+0x9f/0x100\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n    Freed by task 9475:\n    kfree+0x212/0x290\n    handle_one_map+0x23c/0x3b0\n    ceph_osdc_handle_map+0x3c9/0x590\n    mon_dispatch+0x655/0x6f0\n    ceph_con_process_message+0xc3/0xe0\n    ceph_con_v1_try_read+0x614/0x760\n    ceph_con_workfn+0x2de/0x650\n    process_one_work+0x486/0x7c0\n    process_scheduled_works+0x73/0x90\n    worker_thread+0x1c8/0x2a0\n    kthread+0x2ec/0x300\n    ret_from_fork+0x24/0x40\n    ret_from_fork_asm+0x1a/0x30\n\nRewrite the wait loop to check the above condition directly with\nclient-\u003emonc.mutex and client-\u003eosdc.lock taken as appropriate.  While\nat it, improve the timeout handling (previously mount_timeout could be\nexceeded in case wait_event_interruptible_timeout() slept more than\nonce) and access client-\u003eauth_err under client-\u003emonc.mutex to match\nhow it\u0027s set in finish_auth().\n\nmonmap_show() and osdmap_show() now take the respective lock before\naccessing the map as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-02T15:34:50.454Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bb4910c5fd436701faf367e1b5476a5a6d2aff1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/05ec43e9a9de67132dc8cd3b22afef001574947f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c8ccdc1714d9fabecd26e1be7db1771061acc6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/183ad6e3b651e8fb0b66d6a2678f4b80bfbba092"
        },
        {
          "url": "https://git.kernel.org/stable/c/e08021b3b56b2407f37b5fe47b654be80cc665fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/3fc43120b22a3d4f1fbeff56a35ce2105b6a5683"
        },
        {
          "url": "https://git.kernel.org/stable/c/076381c261374c587700b3accf410bdd2dba334e"
        }
      ],
      "title": "libceph: fix potential use-after-free in have_mon_and_osd_map()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68285",
    "datePublished": "2025-12-16T15:06:07.078Z",
    "dateReserved": "2025-12-16T14:48:05.292Z",
    "dateUpdated": "2026-01-02T15:34:50.454Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68285\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T16:16:07.293\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlibceph: fix potential use-after-free in have_mon_and_osd_map()\\n\\nThe wait loop in __ceph_open_session() can race with the client\\nreceiving a new monmap or osdmap shortly after the initial map is\\nreceived.  Both ceph_monc_handle_map() and handle_one_map() install\\na new map immediately after freeing the old one\\n\\n    kfree(monc-\u003emonmap);\\n    monc-\u003emonmap = monmap;\\n\\n    ceph_osdmap_destroy(osdc-\u003eosdmap);\\n    osdc-\u003eosdmap = newmap;\\n\\nunder client-\u003emonc.mutex and client-\u003eosdc.lock respectively, but\\nbecause neither is taken in have_mon_and_osd_map() it\u0027s possible for\\nclient-\u003emonc.monmap-\u003eepoch and client-\u003eosdc.osdmap-\u003eepoch arms in\\n\\n    client-\u003emonc.monmap \u0026\u0026 client-\u003emonc.monmap-\u003eepoch \u0026\u0026\\n        client-\u003eosdc.osdmap \u0026\u0026 client-\u003eosdc.osdmap-\u003eepoch;\\n\\ncondition to dereference an already freed map.  This happens to be\\nreproducible with generic/395 and generic/397 with KASAN enabled:\\n\\n    BUG: KASAN: slab-use-after-free in have_mon_and_osd_map+0x56/0x70\\n    Read of size 4 at addr ffff88811012d810 by task mount.ceph/13305\\n    CPU: 2 UID: 0 PID: 13305 Comm: mount.ceph Not tainted 6.14.0-rc2-build2+ #1266\\n    ...\\n    Call Trace:\\n    \u003cTASK\u003e\\n    have_mon_and_osd_map+0x56/0x70\\n    ceph_open_session+0x182/0x290\\n    ceph_get_tree+0x333/0x680\\n    vfs_get_tree+0x49/0x180\\n    do_new_mount+0x1a3/0x2d0\\n    path_mount+0x6dd/0x730\\n    do_mount+0x99/0xe0\\n    __do_sys_mount+0x141/0x180\\n    do_syscall_64+0x9f/0x100\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n    \u003c/TASK\u003e\\n\\n    Allocated by task 13305:\\n    ceph_osdmap_alloc+0x16/0x130\\n    ceph_osdc_init+0x27a/0x4c0\\n    ceph_create_client+0x153/0x190\\n    create_fs_client+0x50/0x2a0\\n    ceph_get_tree+0xff/0x680\\n    vfs_get_tree+0x49/0x180\\n    do_new_mount+0x1a3/0x2d0\\n    path_mount+0x6dd/0x730\\n    do_mount+0x99/0xe0\\n    __do_sys_mount+0x141/0x180\\n    do_syscall_64+0x9f/0x100\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n    Freed by task 9475:\\n    kfree+0x212/0x290\\n    handle_one_map+0x23c/0x3b0\\n    ceph_osdc_handle_map+0x3c9/0x590\\n    mon_dispatch+0x655/0x6f0\\n    ceph_con_process_message+0xc3/0xe0\\n    ceph_con_v1_try_read+0x614/0x760\\n    ceph_con_workfn+0x2de/0x650\\n    process_one_work+0x486/0x7c0\\n    process_scheduled_works+0x73/0x90\\n    worker_thread+0x1c8/0x2a0\\n    kthread+0x2ec/0x300\\n    ret_from_fork+0x24/0x40\\n    ret_from_fork_asm+0x1a/0x30\\n\\nRewrite the wait loop to check the above condition directly with\\nclient-\u003emonc.mutex and client-\u003eosdc.lock taken as appropriate.  While\\nat it, improve the timeout handling (previously mount_timeout could be\\nexceeded in case wait_event_interruptible_timeout() slept more than\\nonce) and access client-\u003eauth_err under client-\u003emonc.mutex to match\\nhow it\u0027s set in finish_auth().\\n\\nmonmap_show() and osdmap_show() now take the respective lock before\\naccessing the map as well.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05ec43e9a9de67132dc8cd3b22afef001574947f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/076381c261374c587700b3accf410bdd2dba334e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/183ad6e3b651e8fb0b66d6a2678f4b80bfbba092\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3fc43120b22a3d4f1fbeff56a35ce2105b6a5683\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c8ccdc1714d9fabecd26e1be7db1771061acc6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb4910c5fd436701faf367e1b5476a5a6d2aff1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e08021b3b56b2407f37b5fe47b654be80cc665fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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