CVE-2026-31686
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
mm/kasan: fix double free for kasan pXds
kasan_free_pxd() assumes the page table is always struct page aligned. But that's not always the case for all architectures. E.g. In case of powerpc with 64K pagesize, PUD table (of size 4096) comes from slab cache named pgtable-2^9. Hence instead of page_to_virt(pxd_page()) let's just directly pass the start of the pxd table which is passed as the 1st argument.
This fixes the below double free kasan issue seen with PMEM:
radix-mmu: Mapped 0x0000047d10000000-0x0000047f90000000 with 2.00 MiB pages ================================================================== BUG: KASAN: double-free in kasan_remove_zero_shadow+0x9c4/0xa20 Free of addr c0000003c38e0000 by task ndctl/2164
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The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3c38c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:c0000003bfd63e01 flags: 0x63ffff800000040(head|node=6|zone=0|lastcpupid=0x7ffff) page_type: f5(slab) raw: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000 raw: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01 head: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000 head: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01 head: 063ffff800000002 c00c000000f0e301 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected
Detalles técnicos trazas, registros y código del informe original
CPU: 34 UID: 0 PID: 2164 Comm: ndctl Not tainted 6.19.0-rc1-00048-gea1013c15392 #157 VOLUNTARY Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_012) hv:phyp pSeries Call Trace: dump_stack_lvl+0x88/0xc4 (unreliable) print_report+0x214/0x63c kasan_report_invalid_free+0xe4/0x110 check_slab_allocation+0x100/0x150 kmem_cache_free+0x128/0x6e0 kasan_remove_zero_shadow+0x9c4/0xa20 memunmap_pages+0x2b8/0x5c0 devm_action_release+0x54/0x70 release_nodes+0xc8/0x1a0 devres_release_all+0xe0/0x140 device_unbind_cleanup+0x30/0x120 device_release_driver_internal+0x3e4/0x450 unbind_store+0xfc/0x110 drv_attr_store+0x78/0xb0 sysfs_kf_write+0x114/0x140 kernfs_fop_write_iter+0x264/0x3f0 vfs_write+0x3bc/0x7d0 ksys_write+0xa4/0x190 system_call_exception+0x190/0x480 system_call_vectored_common+0x15c/0x2ec ---- interrupt: 3000 at 0x7fff93b3d3f4 NIP: 00007fff93b3d3f4 LR: 00007fff93b3d3f4 CTR: 0000000000000000 REGS: c0000003f1b07e80 TRAP: 3000 Not tainted (6.19.0-rc1-00048-gea1013c15392) MSR: 800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 48888208 XER: 00000000 <...> NIP [00007fff93b3d3f4] 0x7fff93b3d3f4 LR [00007fff93b3d3f4] 0x7fff93b3d3f4 ---- interrupt: 3000 The buggy address belongs to the object at c0000003c38e0000 which belongs to the cache pgtable-2^9 of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [c0000003c38e0000, c0000003c38e1000) [ 138.953636] [ T2164] Memory state around the buggy address: [ 138.953643] [ T2164] c0000003c38dff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 138.953652] [ T2164] c0000003c38dff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 138.953661] [ T2164] >c0000003c38e0000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 138.953669] [ T2164] ^ [ 138.953675] [ T2164] c0000003c38e0080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 138.953684] [ T2164] c0000003c38e0100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 138.953692] [ T2164] ================================================================== [ 138.953701] [ T2164] Disabling lock debugging due to kernel taint
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- Fecha de la puntuación: 5/10/2026
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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1059Command and Scripting Interpreterexecution60 %
AV:L/PR:L sin UI permite escalada local. Double-free en kernel KASAN puede llevar a ejecución de código arbitrario tras corrupción de memoria.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-415
Referencias
- https://git.kernel.org/stable/c/2277246ea265cdca64ce6fdea4b26cd6ff0ec4db
- https://git.kernel.org/stable/c/3298bdf5a878ded06351eb293856fa84e050029e
- https://git.kernel.org/stable/c/51d8c78be0c27ddb91bc2c0263941d8b30a47d3b
- https://git.kernel.org/stable/c/7d7b2d5c107a1f6302cf0006d859985e7c3ddd1c
- https://git.kernel.org/stable/c/85d98614e089a67dc6faa8ca766fe10a639f82b4
- https://git.kernel.org/stable/c/a05f77cb227c39c5069aea6f12762a29d1e6c103
- https://git.kernel.org/stable/c/b38237a2ea9c6c19836eee2c57037e1f9f103576
- https://git.kernel.org/stable/c/cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87
- https://git.kernel.org/stable/c/f6204f7ff6aff62ce6242a76982c5ba3a9ded707
JSON original (NVD)
Mostrar
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"vulnStatus": "Modified",
"weaknesses": [
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"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-415"
}
]
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kasan: fix double free for kasan pXds\n\nkasan_free_pxd() assumes the page table is always struct page aligned. \nBut that's not always the case for all architectures. E.g. In case of\npowerpc with 64K pagesize, PUD table (of size 4096) comes from slab cache\nnamed pgtable-2^9. Hence instead of page_to_virt(pxd_page()) let's just\ndirectly pass the start of the pxd table which is passed as the 1st\nargument.\n\nThis fixes the below double free kasan issue seen with PMEM:\n\nradix-mmu: Mapped 0x0000047d10000000-0x0000047f90000000 with 2.00 MiB pages\n==================================================================\nBUG: KASAN: double-free in kasan_remove_zero_shadow+0x9c4/0xa20\nFree of addr c0000003c38e0000 by task ndctl/2164\n\nCPU: 34 UID: 0 PID: 2164 Comm: ndctl Not tainted 6.19.0-rc1-00048-gea1013c15392 #157 VOLUNTARY\nHardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_012) hv:phyp pSeries\nCall Trace:\n dump_stack_lvl+0x88/0xc4 (unreliable)\n print_report+0x214/0x63c\n kasan_report_invalid_free+0xe4/0x110\n check_slab_allocation+0x100/0x150\n kmem_cache_free+0x128/0x6e0\n kasan_remove_zero_shadow+0x9c4/0xa20\n memunmap_pages+0x2b8/0x5c0\n devm_action_release+0x54/0x70\n release_nodes+0xc8/0x1a0\n devres_release_all+0xe0/0x140\n device_unbind_cleanup+0x30/0x120\n device_release_driver_internal+0x3e4/0x450\n unbind_store+0xfc/0x110\n drv_attr_store+0x78/0xb0\n sysfs_kf_write+0x114/0x140\n kernfs_fop_write_iter+0x264/0x3f0\n vfs_write+0x3bc/0x7d0\n ksys_write+0xa4/0x190\n system_call_exception+0x190/0x480\n system_call_vectored_common+0x15c/0x2ec\n---- interrupt: 3000 at 0x7fff93b3d3f4\nNIP: 00007fff93b3d3f4 LR: 00007fff93b3d3f4 CTR: 0000000000000000\nREGS: c0000003f1b07e80 TRAP: 3000 Not tainted (6.19.0-rc1-00048-gea1013c15392)\nMSR: 800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 48888208 XER: 00000000\n<...>\nNIP [00007fff93b3d3f4] 0x7fff93b3d3f4\nLR [00007fff93b3d3f4] 0x7fff93b3d3f4\n---- interrupt: 3000\n\n The buggy address belongs to the object at c0000003c38e0000\n which belongs to the cache pgtable-2^9 of size 4096\n The buggy address is located 0 bytes inside of\n 4096-byte region [c0000003c38e0000, c0000003c38e1000)\n\n The buggy address belongs to the physical page:\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3c38c\n head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n memcg:c0000003bfd63e01\n flags: 0x63ffff800000040(head|node=6|zone=0|lastcpupid=0x7ffff)\n page_type: f5(slab)\n raw: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000\n raw: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01\n head: 063ffff800000040 c000000140058980 5deadbeef0000122 0000000000000000\n head: 0000000000000000 0000000080200020 00000000f5000000 c0000003bfd63e01\n head: 063ffff800000002 c00c000000f0e301 00000000ffffffff 00000000ffffffff\n head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004\n page dumped because: kasan: bad access detected\n\n[ 138.953636] [ T2164] Memory state around the buggy address:\n[ 138.953643] [ T2164] c0000003c38dff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 138.953652] [ T2164] c0000003c38dff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 138.953661] [ T2164] >c0000003c38e0000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 138.953669] [ T2164] ^\n[ 138.953675] [ T2164] c0000003c38e0080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 138.953684] [ T2164] c0000003c38e0100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n[ 138.953692] [ T2164] ==================================================================\n[ 138.953701] [ T2164] Disabling lock debugging due to kernel taint"
}
],
"lastModified": "2026-06-17T10:34:14.323",
"configurations": [
{
"nodes": [
{
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