CVE-2026-98815
Estado: RecibidaSin puntuar—
Gravedad—Sin puntuar
Probabilidad de explotación0.20 %mayor que el 9 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
nvme: corrige la vida útil de cdev
El bot Sashiko informó de un posible problema con la vida útil del cdev en [0]; el código de ahí se basa en gran medida en el código de NVMe.
Actualmente, los métodos file_operations .open y .release del NS head toman y liberan una referencia a nvme_ns_head para garantizar que esta estructura no desaparezca mientras se abren descriptores de archivo para ese cdev.
En modo multipath, al desmontar el NS head, se llama a nvme_cdev_del() -> cdev_device_del() -> cdev_del().
Leer descripción completaMostrar menos
Sin embargo, tras retornar de cdev_del(), los cdev que ya estaban abiertos permanecen y sus fops siguen siendo invocables. Por tanto, aún podemos referenciar el cdev después de que el contador de referencias de nvme_ns_head llegue a 0 (y se libere).
Esto puede demostrarse con una aplicación que espera entre abrir el cdev y emitir el ioctl mientras se desmonta el NS head:
# ./ioctl_file /dev/ng1n1 & # waiting 10 seconds ....
Detalles técnicos trazas, registros y código del informe original
# ./ini_nvme_teardown.sh [ 21.221718] nvme nvme1: Removing ctrl: NQN "nvme-test-target" [ 21.274609] nvme nvme2: Removing ctrl: NQN "nvme-test-target" # now going to issue ioctl .... [ 26.549285] ================================================================== [ 26.550841] BUG: KASAN: slab-use-after-free in cdev_put.part.0+0x3d/0x40 [ 26.552352] Read of size 8 at addr ffff88811e7fa170 by task ioctl_file/237 [ 26.553805] [ 26.554227] CPU: 3 UID: 0 PID: 237 Comm: ioctl_file Not tainted 7.2.0-rc1-00004-g6852a10e32d4 #921 PREEMPT(lazy) [ 26.554236] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 26.554241] Call Trace: [ 26.554245] <TASK> [ 26.554248] dump_stack_lvl+0x68/0xa0 [ 26.554266] print_report+0x10d/0x5d0 [ 26.554276] ? __virt_addr_valid+0x21d/0x3f0 [ 26.554287] ? cdev_put.part.0+0x3d/0x40 [ 26.554292] kasan_report+0x96/0xd0 [ 26.554300] ? cdev_put.part.0+0x3d/0x40 [ 26.554307] cdev_put.part.0+0x3d/0x40 [ 26.554313] __fput+0x7bc/0xa70 [ 26.554322] fput_close_sync+0xd8/0x190 [ 26.554328] ? __pfx_fput_close_sync+0x10/0x10 [ 26.554337] __x64_sys_close+0x79/0xd0 [ 26.554344] do_syscall_64+0x117/0x6b0 [ 26.554351] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 26.554358] RIP: 0033:0x7f938c067727 [ 26.554364] Code: 48 89 fa 4c 89 df e8 28 ad 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5bf [ 26.554369] RSP: 002b:00007fff49f05980 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 [ 26.554376] RAX: ffffffffffffffda RBX: 00007f938bfd7780 RCX: 00007f938c067727 [ 26.554380] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 26.554383] RBP: 00007fff49f05a10 R08: 0000000000000000 R09: 0000000000000000 [ 26.554386] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 26.554389] R13: 00007fff49f05b40 R14: 00007f938c207000 R15: 000055c148471d78 [ 26.554397] </TASK> [ 26.554399] [ 26.575612] Allocated by task 100: [ 26.575871] kasan_save_stack+0x24/0x50 [ 26.576157] kasan_save_track+0x14/0x30 [ 26.576418] __kasan_kmalloc+0x7f/0x90 [ 26.576668] __kmalloc_noprof+0x281/0x6c0 [ 26.576938] nvme_alloc_ns+0x7f7/0x3170 [ 26.577206] nvme_scan_ns+0x508/0x880 [ 26.577449] async_run_entry_fn+0x8c/0x350 [ 26.577723] process_scheduled_works+0xb6f/0x1a00 [ 26.578034] worker_thread+0x4ad/0xb40 [ 26.578283] kthread+0x34f/0x450 [ 26.578501] ret_from_fork+0x563/0x800 [ 26.578752] ret_from_fork_asm+0x1a/0x30 [ 26.579012] [ 26.579124] Freed by task 237: [ 26.579335] kasan_save_stack+0x24/0x50 [ 26.579596] kasan_save_track+0x14/0x30 [ 26.579855] kasan_save_free_info+0x3a/0x60 [ 26.580131] __kasan_slab_free+0x43/0x70 [ 26.580388] kfree+0x321/0x500 [ 26.580591] nvme_ns_head_chr_release+0x39/0x50 [ 26.580883] __fput+0x352/0xa70 [ 26.581095] fput_close_sync+0xd8/0x190 [ 26.581350] __x64_sys_close+0x79/0xd0 [ 26.581595] do_syscall_64+0x117/0x6b0 [ 26.581842] entry_SYSCAL ---truncated---
Traducción automática del texto original de NVD (en inglés).
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días
- 0.20 %
- Percentil entre todas las CVEs puntuadas
- 9
- Fecha de la puntuación
- 20/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98815",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "98b09ad7934482e64db4b4477d91e3bbf43adf4c",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "9952f3882ecba709092379b71e02b09762b26f96",
"versionType": "git"
},
{
"status": "affected",
"version": "0",
"lessThan": "7.2.10",
"versionType": "semver"
}
],
"programFiles": [
"drivers/nvme/host/core.c",
"drivers/nvme/host/multipath.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/host/core.c",
"drivers/nvme/host/multipath.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:35.640",
"references": [
{
"url": "https://git.kernel.org/stable/c/98b09ad7934482e64db4b4477d91e3bbf43adf4c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9952f3882ecba709092379b71e02b09762b26f96",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme: fix cdev lifetime\n\nSashiko bot reported a potential problem for the cdev lifetime in [0]\n- the code there is heavily based on the NVMe code.\n\nCurrently the NS head .open and .release file_operations methods take and\nput a reference to the nvme_ns_head to ensure that this structure does not\ndisappear while we open fds for that cdev.\n\nIn multipath mode, when we teardown the NS head, we call nvme_cdev_del() ->\ncdev_device_del() -> cdev_del(). However after cdev_del() returns, cdevs\nalready open will remain and their fops will still be callable. As such,\nwe can still reference the cdev after the nvme_ns_head reference count\ndrops to 0 (and is freed).\n\nThis can be shown with an application which delays between opening the cdev\nand issuing the ioctl while the NS head is being torn down:\n\n# ./ioctl_file /dev/ng1n1 &\n# waiting 10 seconds ....\n\n# ./ini_nvme_teardown.sh\n[ 21.221718] nvme nvme1: Removing ctrl: NQN \"nvme-test-target\"\n[ 21.274609] nvme nvme2: Removing ctrl: NQN \"nvme-test-target\"\n# now going to issue ioctl ....\n[ 26.549285] ==================================================================\n[ 26.550841] BUG: KASAN: slab-use-after-free in cdev_put.part.0+0x3d/0x40\n[ 26.552352] Read of size 8 at addr ffff88811e7fa170 by task ioctl_file/237\n[ 26.553805]\n[ 26.554227] CPU: 3 UID: 0 PID: 237 Comm: ioctl_file Not tainted 7.2.0-rc1-00004-g6852a10e32d4 #921 PREEMPT(lazy)\n[ 26.554236] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 26.554241] Call Trace:\n[ 26.554245] <TASK>\n[ 26.554248] dump_stack_lvl+0x68/0xa0\n[ 26.554266] print_report+0x10d/0x5d0\n[ 26.554276] ? __virt_addr_valid+0x21d/0x3f0\n[ 26.554287] ? cdev_put.part.0+0x3d/0x40\n[ 26.554292] kasan_report+0x96/0xd0\n[ 26.554300] ? cdev_put.part.0+0x3d/0x40\n[ 26.554307] cdev_put.part.0+0x3d/0x40\n[ 26.554313] __fput+0x7bc/0xa70\n[ 26.554322] fput_close_sync+0xd8/0x190\n[ 26.554328] ? __pfx_fput_close_sync+0x10/0x10\n[ 26.554337] __x64_sys_close+0x79/0xd0\n[ 26.554344] do_syscall_64+0x117/0x6b0\n[ 26.554351] entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[ 26.554358] RIP: 0033:0x7f938c067727\n[ 26.554364] Code: 48 89 fa 4c 89 df e8 28 ad 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5bf\n[ 26.554369] RSP: 002b:00007fff49f05980 EFLAGS: 00000202 ORIG_RAX: 0000000000000003\n[ 26.554376] RAX: ffffffffffffffda RBX: 00007f938bfd7780 RCX: 00007f938c067727\n[ 26.554380] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n[ 26.554383] RBP: 00007fff49f05a10 R08: 0000000000000000 R09: 0000000000000000\n[ 26.554386] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000\n[ 26.554389] R13: 00007fff49f05b40 R14: 00007f938c207000 R15: 000055c148471d78\n[ 26.554397] </TASK>\n[ 26.554399]\n[ 26.575612] Allocated by task 100:\n[ 26.575871] kasan_save_stack+0x24/0x50\n[ 26.576157] kasan_save_track+0x14/0x30\n[ 26.576418] __kasan_kmalloc+0x7f/0x90\n[ 26.576668] __kmalloc_noprof+0x281/0x6c0\n[ 26.576938] nvme_alloc_ns+0x7f7/0x3170\n[ 26.577206] nvme_scan_ns+0x508/0x880\n[ 26.577449] async_run_entry_fn+0x8c/0x350\n[ 26.577723] process_scheduled_works+0xb6f/0x1a00\n[ 26.578034] worker_thread+0x4ad/0xb40\n[ 26.578283] kthread+0x34f/0x450\n[ 26.578501] ret_from_fork+0x563/0x800\n[ 26.578752] ret_from_fork_asm+0x1a/0x30\n[ 26.579012]\n[ 26.579124] Freed by task 237:\n[ 26.579335] kasan_save_stack+0x24/0x50\n[ 26.579596] kasan_save_track+0x14/0x30\n[ 26.579855] kasan_save_free_info+0x3a/0x60\n[ 26.580131] __kasan_slab_free+0x43/0x70\n[ 26.580388] kfree+0x321/0x500\n[ 26.580591] nvme_ns_head_chr_release+0x39/0x50\n[ 26.580883] __fput+0x352/0xa70\n[ 26.581095] fput_close_sync+0xd8/0x190\n[ 26.581350] __x64_sys_close+0x79/0xd0\n[ 26.581595] do_syscall_64+0x117/0x6b0\n[ 26.581842] entry_SYSCAL\n---truncated---"
}
],
"lastModified": "2026-10-19T10:19:45.570",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}