Vulnerability-Lookup

CVE-2026-31686 (GCVE-0-2026-31686)

Vulnerability from cvelistv5 – Published: 2026-04-27 17:30 – Updated: 2026-04-27 17:30

Title

mm/kasan: fix double free for kasan pXds

Summary

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 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) 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 [ 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

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/cec74b2ab7dff866b…
	https://git.kernel.org/stable/c/a05f77cb227c39c50…
	https://git.kernel.org/stable/c/f6204f7ff6aff62ce…
	https://git.kernel.org/stable/c/85d98614e089a67dc…
	https://git.kernel.org/stable/c/b38237a2ea9c6c198…
	https://git.kernel.org/stable/c/51d8c78be0c27ddb9…

Impacted products

Vendor

Product

Version

Linux

Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87 (git)
Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < a05f77cb227c39c5069aea6f12762a29d1e6c103 (git)
Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < f6204f7ff6aff62ce6242a76982c5ba3a9ded707 (git)
Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < 85d98614e089a67dc6faa8ca766fe10a639f82b4 (git)
Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < b38237a2ea9c6c19836eee2c57037e1f9f103576 (git)
Affected: 0207df4fa1a869281ddbf72db6203dbf036b3e1a , < 51d8c78be0c27ddb91bc2c0263941d8b30a47d3b (git)

Linux

Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/kasan/init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87",
              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "0207df4fa1a869281ddbf72db6203dbf036b3e1a",
              "versionType": "git"
            },
            {
              "lessThan": "b38237a2ea9c6c19836eee2c57037e1f9f103576",
              "status": "affected",
              "version": "0207df4fa1a869281ddbf72db6203dbf036b3e1a",
              "versionType": "git"
            },
            {
              "lessThan": "51d8c78be0c27ddb91bc2c0263941d8b30a47d3b",
              "status": "affected",
              "version": "0207df4fa1a869281ddbf72db6203dbf036b3e1a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.136",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc1",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027s 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\u0027s 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 \u003cSF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE\u003e  CR: 48888208  XER: 00000000\n\u003c...\u003e\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] \u003ec0000003c38e0000: 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T17:30:53.853Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87"
        },
        {
          "url": "https://git.kernel.org/stable/c/a05f77cb227c39c5069aea6f12762a29d1e6c103"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6204f7ff6aff62ce6242a76982c5ba3a9ded707"
        },
        {
          "url": "https://git.kernel.org/stable/c/85d98614e089a67dc6faa8ca766fe10a639f82b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b38237a2ea9c6c19836eee2c57037e1f9f103576"
        },
        {
          "url": "https://git.kernel.org/stable/c/51d8c78be0c27ddb91bc2c0263941d8b30a47d3b"
        }
      ],
      "title": "mm/kasan: fix double free for kasan pXds",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31686",
    "datePublished": "2026-04-27T17:30:53.853Z",
    "dateReserved": "2026-03-09T15:48:24.131Z",
    "dateUpdated": "2026-04-27T17:30:53.853Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31686",
      "date": "2026-04-28",
      "epss": "0.00024",
      "percentile": "0.06756"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31686\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-27T18:16:53.987\",\"lastModified\":\"2026-04-27T18:32:22.917\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\u0027s 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\u0027s 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 \u003cSF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE\u003e  CR: 48888208  XER: 00000000\\n\u003c...\u003e\\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] \u003ec0000003c38e0000: 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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/51d8c78be0c27ddb91bc2c0263941d8b30a47d3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85d98614e089a67dc6faa8ca766fe10a639f82b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a05f77cb227c39c5069aea6f12762a29d1e6c103\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b38237a2ea9c6c19836eee2c57037e1f9f103576\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6204f7ff6aff62ce6242a76982c5ba3a9ded707\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-31686

Vulnerability from fkie_nvd - Published: 2026-04-27 18:16 - Updated: 2026-04-27 18:32

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/51d8c78be0c27ddb91bc2c0263941d8b30a47d3b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/85d98614e089a67dc6faa8ca766fe10a639f82b4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a05f77cb227c39c5069aea6f12762a29d1e6c103
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b38237a2ea9c6c19836eee2c57037e1f9f103576
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f6204f7ff6aff62ce6242a76982c5ba3a9ded707

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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\u0027s 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\u0027s 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 \u003cSF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE\u003e  CR: 48888208  XER: 00000000\n\u003c...\u003e\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] \u003ec0000003c38e0000: 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"
    }
  ],
  "id": "CVE-2026-31686",
  "lastModified": "2026-04-27T18:32:22.917",
  "metrics": {},
  "published": "2026-04-27T18:16:53.987",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/51d8c78be0c27ddb91bc2c0263941d8b30a47d3b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/85d98614e089a67dc6faa8ca766fe10a639f82b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a05f77cb227c39c5069aea6f12762a29d1e6c103"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b38237a2ea9c6c19836eee2c57037e1f9f103576"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cec74b2ab7dff866b1d77eaa545b9e8fd14a1f87"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f6204f7ff6aff62ce6242a76982c5ba3a9ded707"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-31686 (GCVE-0-2026-31686)

FKIE_CVE-2026-31686

Tags

Sightings

Nomenclature