CVE-2026-98725 (GCVE-0-2026-98725)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-21 12:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge() nvmet_auth_challenge() receives its output buffer as a void pointer. sizeof(*d) therefore evaluates to one with GCC and undercounts the fixed challenge header by 15 bytes. A short AUTH_RECEIVE buffer can pass the check before the challenge is copied past the end of its allocation. Use the typed challenge pointer when calculating the response size. BUG: KASAN: slab-out-of-bounds in nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569) Write of size 32 by task kworker/1:1H/64 Workqueue: nvmet_tcp_wq nvmet_tcp_io_work Call Trace: nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569) nvmet_tcp_try_recv_pdu (drivers/nvme/target/tcp.c:1119 drivers/nvme/target/tcp.c:1243) nvmet_tcp_io_work (drivers/nvme/target/tcp.c:1350 drivers/nvme/target/tcp.c:1382 drivers/nvme/target/tcp.c:1445) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) The buggy address is located 16 bytes inside of allocated 33-byte region [ffff888000554e80, ffff888000554ea1) Kernel panic - not syncing: KASAN: panic_on_warn set ...
References
Impacted products
Vendor Product Version
Linux Linux Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()\n\nnvmet_auth_challenge() receives its output buffer as a void pointer.\nsizeof(*d) therefore evaluates to one with GCC and undercounts the fixed\nchallenge header by 15 bytes.  A short AUTH_RECEIVE buffer can pass the\ncheck before the challenge is copied past the end of its allocation.\n\nUse the typed challenge pointer when calculating the response size.\n\n  BUG: KASAN: slab-out-of-bounds in nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569)\n  Write of size 32 by task kworker/1:1H/64\n  Workqueue: nvmet_tcp_wq nvmet_tcp_io_work\n  Call Trace:\n  nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569)\n  nvmet_tcp_try_recv_pdu (drivers/nvme/target/tcp.c:1119 drivers/nvme/target/tcp.c:1243)\n  nvmet_tcp_io_work (drivers/nvme/target/tcp.c:1350 drivers/nvme/target/tcp.c:1382 drivers/nvme/target/tcp.c:1445)\n  process_one_work (kernel/workqueue.c:3322)\n  worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)\n  kthread (kernel/kthread.c:436)\n  ret_from_fork (arch/x86/kernel/process.c:158)\n  ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n  The buggy address is located 16 bytes inside of\n   allocated 33-byte region [ffff888000554e80, ffff888000554ea1)\n  Kernel panic - not syncing: KASAN: panic_on_warn set ..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:56:05.735Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ef4dfad231a787aded76e5b03788ddb18c8aebab"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d61131acd742cf97ee64e453383e41b46568513"
        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/fa6778e030bed9841ddcdf96bc7018da9ac03562"
        }
      ],
      "title": "nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98725",
    "datePublished": "2026-10-18T15:47:02.735Z",
    "dateReserved": "2026-09-25T10:25:14.366Z",
    "dateUpdated": "2026-10-21T12:56:05.735Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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