Vulnerability-Lookup

CVE-2026-89754 (GCVE-0-2026-89754)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-13 06:34

Title

mm/pagewalk: fix stale walk->action escaping walk_pmd_range()

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/pagewalk: fix stale walk->action escaping walk_pmd_range() If ->pmd_entry() sets walk->action = ACTION_AGAIN, the pmd_none() check is retried. The PMD entry may be cleared at the point of retry. In this case, if walk->ops->install_pte is not specified, the code continues to the next PMD entry in the range without resetting walk->action to ACTION_SUBTREE. This leaves walk->action erroneously set to ACTION_AGAIN, which is incorrect. This was incorrect but not problematic up until commit 3b89863c3fa4 ("mm/pagewalk: fix race between concurrent split and refault") which updated walk_pud_range() to check for walk->action == ACTION_AGAIN upon walk_pmd_range()'s return, causing the PUD walk to be retried. In this case this results in duplicate walk callbacks being invoked, which is erroneous and will break any caller that is not idempotent with respect to this (and waste time for those which are). The result is an out-of-bounds write, triggered by a local fuzzer: [ 2.272695] ================================================================== [ 2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190 [ 2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106 [ 2.274966] [ 2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy) [ 2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.275164] Call Trace: [ 2.275170] <TASK> [ 2.275172] dump_stack_lvl+0x53/0x70 [ 2.275200] print_report+0xd0/0x630 [ 2.275210] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 2.275219] ? irqentry_exit+0xd2/0x670 [ 2.275224] ? irqentry_exit+0xd2/0x670 [ 2.275226] ? __virt_addr_valid+0xef/0x1a0 [ 2.275239] ? __mincore_unmapped_range+0x14f/0x190 [ 2.275242] kasan_report+0xce/0x100 [ 2.275245] ? __mincore_unmapped_range+0x14f/0x190 [ 2.275248] __mincore_unmapped_range+0x14f/0x190 [ 2.275252] mincore_unmapped_range+0x45/0x70 [ 2.275254] walk_pgd_range+0xafc/0xfc0 [ 2.275261] ? __pfx_walk_pgd_range+0x10/0x10 [ 2.275264] ? __update_load_avg_se+0x3d1/0x670 [ 2.275275] __walk_page_range+0xc0/0x310 [ 2.275278] ? __pfx_find_vma+0x10/0x10 [ 2.275281] ? finish_task_switch.isra.0+0x16d/0x4f0 [ 2.275290] walk_page_range_mm_unsafe+0x26f/0x3a0 [ 2.275293] ? __pfx_mtree_load+0x10/0x10 [ 2.275298] ? __pfx_walk_page_range_mm_unsafe+0x10/0x10 [ 2.275302] ? __free_frozen_pages+0x54d/0x7e0 [ 2.275308] __do_sys_mincore+0x132/0x380 [ 2.275311] do_syscall_64+0xf9/0x540 [ 2.275316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 2.275322] RIP: 0033:0x422ccd [ 2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b [ 2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd [ 2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000 [ 2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100 [ 2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf [ 2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001 [ 2.275346] </TASK> [ 2.275347] [ 2.296904] The buggy address belongs to the object at ffff888008d9b000 [ 2.296904] which belongs to the cache sigqueue of size 80 [ 2.298151] The buggy address is located 0 bytes inside of [ 2.298151] allocated 80-byte region [ffff888008d9b000, ffff888008d9b050) [ 2.299408] [ 2.299601] The buggy address belongs to the physical page: [ 2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b ---truncated---

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/895cd4ecbb2e03d75…
https://git.kernel.org/stable/c/c05cdc2ab365b9809…
https://git.kernel.org/stable/c/aedf2efd18977e0ce…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 38ec58670a0c5fc1edabdeccd857e586b7b3f318 , < 895cd4ecbb2e03d7583103c65ee5adaae126ed6d (git) Affected: 3b89863c3fa482912911cd65a12a3aeef662c250 , < c05cdc2ab365b98099386e6c166b9865a4f2a9d3 (git) Affected: 3b89863c3fa482912911cd65a12a3aeef662c250 , < aedf2efd18977e0cef7eb963166e2b1fcc0aa321 (git) Affected: 9bbbebd94dd5be25ec8c899d46ef01b33d5d22c0 (git) Affected: 6.18.21 , < 6.18.50 (semver) Affected: 6.19.11 , < 6.20 (semver)	guessed
Linux	Linux	Affected: 7.0 Unaffected: 0 , < 7.0 (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/pagewalk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "895cd4ecbb2e03d7583103c65ee5adaae126ed6d",
              "status": "affected",
              "version": "38ec58670a0c5fc1edabdeccd857e586b7b3f318",
              "versionType": "git"
            },
            {
              "lessThan": "c05cdc2ab365b98099386e6c166b9865a4f2a9d3",
              "status": "affected",
              "version": "3b89863c3fa482912911cd65a12a3aeef662c250",
              "versionType": "git"
            },
            {
              "lessThan": "aedf2efd18977e0cef7eb963166e2b1fcc0aa321",
              "status": "affected",
              "version": "3b89863c3fa482912911cd65a12a3aeef662c250",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9bbbebd94dd5be25ec8c899d46ef01b33d5d22c0",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.50",
              "status": "affected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/pagewalk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.18.21",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.19.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/pagewalk: fix stale walk-\u003eaction escaping walk_pmd_range()\n\nIf -\u003epmd_entry() sets walk-\u003eaction = ACTION_AGAIN, the pmd_none() check is\nretried.  The PMD entry may be cleared at the point of retry.\n\nIn this case, if walk-\u003eops-\u003einstall_pte is not specified, the code\ncontinues to the next PMD entry in the range without resetting\nwalk-\u003eaction to ACTION_SUBTREE.\n\nThis leaves walk-\u003eaction erroneously set to ACTION_AGAIN, which is\nincorrect.\n\nThis was incorrect but not problematic up until commit 3b89863c3fa4\n(\"mm/pagewalk: fix race between concurrent split and refault\") which\nupdated walk_pud_range() to check for walk-\u003eaction == ACTION_AGAIN upon\nwalk_pmd_range()\u0027s return, causing the PUD walk to be retried.\n\nIn this case this results in duplicate walk callbacks being invoked,\nwhich is erroneous and will break any caller that is not idempotent\nwith respect to this (and waste time for those which are).  The result\nis an out-of-bounds write, triggered by a local fuzzer:\n\n[    2.272695] ==================================================================\n[    2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190\n[    2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106\n[    2.274966]\n[    2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy)\n[    2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[    2.275164] Call Trace:\n[    2.275170]  \u003cTASK\u003e\n[    2.275172]  dump_stack_lvl+0x53/0x70\n[    2.275200]  print_report+0xd0/0x630\n[    2.275210]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[    2.275219]  ? irqentry_exit+0xd2/0x670\n[    2.275224]  ? irqentry_exit+0xd2/0x670\n[    2.275226]  ? __virt_addr_valid+0xef/0x1a0\n[    2.275239]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275242]  kasan_report+0xce/0x100\n[    2.275245]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275248]  __mincore_unmapped_range+0x14f/0x190\n[    2.275252]  mincore_unmapped_range+0x45/0x70\n[    2.275254]  walk_pgd_range+0xafc/0xfc0\n[    2.275261]  ? __pfx_walk_pgd_range+0x10/0x10\n[    2.275264]  ? __update_load_avg_se+0x3d1/0x670\n[    2.275275]  __walk_page_range+0xc0/0x310\n[    2.275278]  ? __pfx_find_vma+0x10/0x10\n[    2.275281]  ? finish_task_switch.isra.0+0x16d/0x4f0\n[    2.275290]  walk_page_range_mm_unsafe+0x26f/0x3a0\n[    2.275293]  ? __pfx_mtree_load+0x10/0x10\n[    2.275298]  ? __pfx_walk_page_range_mm_unsafe+0x10/0x10\n[    2.275302]  ? __free_frozen_pages+0x54d/0x7e0\n[    2.275308]  __do_sys_mincore+0x132/0x380\n[    2.275311]  do_syscall_64+0xf9/0x540\n[    2.275316]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[    2.275322] RIP: 0033:0x422ccd\n[    2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\n[    2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b\n[    2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd\n[    2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000\n[    2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100\n[    2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf\n[    2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001\n[    2.275346]  \u003c/TASK\u003e\n[    2.275347]\n[    2.296904] The buggy address belongs to the object at ffff888008d9b000\n[    2.296904]  which belongs to the cache sigqueue of size 80\n[    2.298151] The buggy address is located 0 bytes inside of\n[    2.298151]  allocated 80-byte region [ffff888008d9b000, ffff888008d9b050)\n[    2.299408]\n[    2.299601] The buggy address belongs to the physical page:\n[    2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Triggered by the unprivileged mincore(2) syscall walking the caller\u0027s own page tables; other local walkers such as /proc/self/pagemap share the same pagewalk bug. The path is not reachable from network packet processing.\nAC:L - The stale ACTION_AGAIN escape is a race with concurrent PMD zap, but the attacker controls both sides by calling mincore in one thread while another faults pages and issues madvise(MADV_DONTNEED) on the same mapping, which is a documented unprivileged repro.\nPR:L - mincore(2) requires only a normal local user; the KASAN report was from UID 1000 with no capabilities, and neither root nor user-namespace capabilities are needed.\nUI:N - The attacker invokes mincore and madvise against their own mapping; no separate victim action is required.\nS:U - Impact is kernel heap corruption and possible privilege escalation on the same host kernel; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Duplicate walk callbacks overflow mincore\u0027s kernel vector into adjacent heap (observed as a slab OOB write) and can copy an extra pagemap entry from neighboring kernel memory via /proc/self/pagemap. That memory corruption can be turned into an arbitrary kernel read.\nI:H - mincore\u0027s cursor has no bounds check, so a retried PUD walk writes past the one-page __get_free_page() buffer into adjacent kernel memory, and a fully zapped range can retry unbounded 0/1 writes. That heap corruption is exploitable for arbitrary writes and control-flow hijacking.\nA:H - The out-of-bounds write can oops or panic the kernel, and leaving walk-\u003eaction at ACTION_AGAIN after a zap can make walk_pud_range retry the same PUD indefinitely, hanging the CPU."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-13T06:34:00.195Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/895cd4ecbb2e03d7583103c65ee5adaae126ed6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c05cdc2ab365b98099386e6c166b9865a4f2a9d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/aedf2efd18977e0cef7eb963166e2b1fcc0aa321"
        }
      ],
      "title": "mm/pagewalk: fix stale walk-\u003eaction escaping walk_pmd_range()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89754",
    "datePublished": "2026-09-11T19:46:57.534Z",
    "dateReserved": "2026-09-11T19:38:34.763Z",
    "dateUpdated": "2026-09-13T06:34:00.195Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89754",
      "date": "2026-09-13",
      "epss": "0.00118",
      "percentile": "0.01945"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89754\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:20:06.387\",\"lastModified\":\"2026-09-13T07:17:39.837\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/pagewalk: fix stale walk-\u003eaction escaping walk_pmd_range()\\n\\nIf -\u003epmd_entry() sets walk-\u003eaction = ACTION_AGAIN, the pmd_none() check is\\nretried.  The PMD entry may be cleared at the point of retry.\\n\\nIn this case, if walk-\u003eops-\u003einstall_pte is not specified, the code\\ncontinues to the next PMD entry in the range without resetting\\nwalk-\u003eaction to ACTION_SUBTREE.\\n\\nThis leaves walk-\u003eaction erroneously set to ACTION_AGAIN, which is\\nincorrect.\\n\\nThis was incorrect but not problematic up until commit 3b89863c3fa4\\n(\\\"mm/pagewalk: fix race between concurrent split and refault\\\") which\\nupdated walk_pud_range() to check for walk-\u003eaction == ACTION_AGAIN upon\\nwalk_pmd_range()\u0027s return, causing the PUD walk to be retried.\\n\\nIn this case this results in duplicate walk callbacks being invoked,\\nwhich is erroneous and will break any caller that is not idempotent\\nwith respect to this (and waste time for those which are).  The result\\nis an out-of-bounds write, triggered by a local fuzzer:\\n\\n[    2.272695] ==================================================================\\n[    2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190\\n[    2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106\\n[    2.274966]\\n[    2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy)\\n[    2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[    2.275164] Call Trace:\\n[    2.275170]  \u003cTASK\u003e\\n[    2.275172]  dump_stack_lvl+0x53/0x70\\n[    2.275200]  print_report+0xd0/0x630\\n[    2.275210]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\\n[    2.275219]  ? irqentry_exit+0xd2/0x670\\n[    2.275224]  ? irqentry_exit+0xd2/0x670\\n[    2.275226]  ? __virt_addr_valid+0xef/0x1a0\\n[    2.275239]  ? __mincore_unmapped_range+0x14f/0x190\\n[    2.275242]  kasan_report+0xce/0x100\\n[    2.275245]  ? __mincore_unmapped_range+0x14f/0x190\\n[    2.275248]  __mincore_unmapped_range+0x14f/0x190\\n[    2.275252]  mincore_unmapped_range+0x45/0x70\\n[    2.275254]  walk_pgd_range+0xafc/0xfc0\\n[    2.275261]  ? __pfx_walk_pgd_range+0x10/0x10\\n[    2.275264]  ? __update_load_avg_se+0x3d1/0x670\\n[    2.275275]  __walk_page_range+0xc0/0x310\\n[    2.275278]  ? __pfx_find_vma+0x10/0x10\\n[    2.275281]  ? finish_task_switch.isra.0+0x16d/0x4f0\\n[    2.275290]  walk_page_range_mm_unsafe+0x26f/0x3a0\\n[    2.275293]  ? __pfx_mtree_load+0x10/0x10\\n[    2.275298]  ? __pfx_walk_page_range_mm_unsafe+0x10/0x10\\n[    2.275302]  ? __free_frozen_pages+0x54d/0x7e0\\n[    2.275308]  __do_sys_mincore+0x132/0x380\\n[    2.275311]  do_syscall_64+0xf9/0x540\\n[    2.275316]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n[    2.275322] RIP: 0033:0x422ccd\\n[    2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\\n[    2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b\\n[    2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd\\n[    2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000\\n[    2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100\\n[    2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf\\n[    2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001\\n[    2.275346]  \u003c/TASK\u003e\\n[    2.275347]\\n[    2.296904] The buggy address belongs to the object at ffff888008d9b000\\n[    2.296904]  which belongs to the cache sigqueue of size 80\\n[    2.298151] The buggy address is located 0 bytes inside of\\n[    2.298151]  allocated 80-byte region [ffff888008d9b000, ffff888008d9b050)\\n[    2.299408]\\n[    2.299601] The buggy address belongs to the physical page:\\n[    2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b\\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/pagewalk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"38ec58670a0c5fc1edabdeccd857e586b7b3f318\",\"lessThan\":\"895cd4ecbb2e03d7583103c65ee5adaae126ed6d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b89863c3fa482912911cd65a12a3aeef662c250\",\"lessThan\":\"c05cdc2ab365b98099386e6c166b9865a4f2a9d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b89863c3fa482912911cd65a12a3aeef662c250\",\"lessThan\":\"aedf2efd18977e0cef7eb963166e2b1fcc0aa321\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9bbbebd94dd5be25ec8c899d46ef01b33d5d22c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.18.21\",\"lessThan\":\"6.18.50\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.11\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/pagewalk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/895cd4ecbb2e03d7583103c65ee5adaae126ed6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aedf2efd18977e0cef7eb963166e2b1fcc0aa321\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c05cdc2ab365b98099386e6c166b9865a4f2a9d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:47:23+00:00",
      "cve": "CVE-2026-89754",
      "id": "CVE-2026-89754",
      "initial_release_date": "2026-09-11T19:46:57.534000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Memory corruption via out-of-bounds write in mm/pagewalk",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89754.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2026-89754

Vulnerability from fkie_nvd - Published: 2026-09-11 20:20 - Updated: 2026-09-13 07:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/895cd4ecbb2e03d7583103c65ee5adaae126ed6d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/aedf2efd18977e0cef7eb963166e2b1fcc0aa321
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c05cdc2ab365b98099386e6c166b9865a4f2a9d3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/pagewalk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "895cd4ecbb2e03d7583103c65ee5adaae126ed6d",
              "status": "affected",
              "version": "38ec58670a0c5fc1edabdeccd857e586b7b3f318",
              "versionType": "git"
            },
            {
              "lessThan": "c05cdc2ab365b98099386e6c166b9865a4f2a9d3",
              "status": "affected",
              "version": "3b89863c3fa482912911cd65a12a3aeef662c250",
              "versionType": "git"
            },
            {
              "lessThan": "aedf2efd18977e0cef7eb963166e2b1fcc0aa321",
              "status": "affected",
              "version": "3b89863c3fa482912911cd65a12a3aeef662c250",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9bbbebd94dd5be25ec8c899d46ef01b33d5d22c0",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.50",
              "status": "affected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/pagewalk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/pagewalk: fix stale walk-\u003eaction escaping walk_pmd_range()\n\nIf -\u003epmd_entry() sets walk-\u003eaction = ACTION_AGAIN, the pmd_none() check is\nretried.  The PMD entry may be cleared at the point of retry.\n\nIn this case, if walk-\u003eops-\u003einstall_pte is not specified, the code\ncontinues to the next PMD entry in the range without resetting\nwalk-\u003eaction to ACTION_SUBTREE.\n\nThis leaves walk-\u003eaction erroneously set to ACTION_AGAIN, which is\nincorrect.\n\nThis was incorrect but not problematic up until commit 3b89863c3fa4\n(\"mm/pagewalk: fix race between concurrent split and refault\") which\nupdated walk_pud_range() to check for walk-\u003eaction == ACTION_AGAIN upon\nwalk_pmd_range()\u0027s return, causing the PUD walk to be retried.\n\nIn this case this results in duplicate walk callbacks being invoked,\nwhich is erroneous and will break any caller that is not idempotent\nwith respect to this (and waste time for those which are).  The result\nis an out-of-bounds write, triggered by a local fuzzer:\n\n[    2.272695] ==================================================================\n[    2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190\n[    2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106\n[    2.274966]\n[    2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy)\n[    2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[    2.275164] Call Trace:\n[    2.275170]  \u003cTASK\u003e\n[    2.275172]  dump_stack_lvl+0x53/0x70\n[    2.275200]  print_report+0xd0/0x630\n[    2.275210]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[    2.275219]  ? irqentry_exit+0xd2/0x670\n[    2.275224]  ? irqentry_exit+0xd2/0x670\n[    2.275226]  ? __virt_addr_valid+0xef/0x1a0\n[    2.275239]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275242]  kasan_report+0xce/0x100\n[    2.275245]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275248]  __mincore_unmapped_range+0x14f/0x190\n[    2.275252]  mincore_unmapped_range+0x45/0x70\n[    2.275254]  walk_pgd_range+0xafc/0xfc0\n[    2.275261]  ? __pfx_walk_pgd_range+0x10/0x10\n[    2.275264]  ? __update_load_avg_se+0x3d1/0x670\n[    2.275275]  __walk_page_range+0xc0/0x310\n[    2.275278]  ? __pfx_find_vma+0x10/0x10\n[    2.275281]  ? finish_task_switch.isra.0+0x16d/0x4f0\n[    2.275290]  walk_page_range_mm_unsafe+0x26f/0x3a0\n[    2.275293]  ? __pfx_mtree_load+0x10/0x10\n[    2.275298]  ? __pfx_walk_page_range_mm_unsafe+0x10/0x10\n[    2.275302]  ? __free_frozen_pages+0x54d/0x7e0\n[    2.275308]  __do_sys_mincore+0x132/0x380\n[    2.275311]  do_syscall_64+0xf9/0x540\n[    2.275316]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[    2.275322] RIP: 0033:0x422ccd\n[    2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\n[    2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b\n[    2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd\n[    2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000\n[    2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100\n[    2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf\n[    2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001\n[    2.275346]  \u003c/TASK\u003e\n[    2.275347]\n[    2.296904] The buggy address belongs to the object at ffff888008d9b000\n[    2.296904]  which belongs to the cache sigqueue of size 80\n[    2.298151] The buggy address is located 0 bytes inside of\n[    2.298151]  allocated 80-byte region [ffff888008d9b000, ffff888008d9b050)\n[    2.299408]\n[    2.299601] The buggy address belongs to the physical page:\n[    2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b\n---truncated---"
    }
  ],
  "id": "CVE-2026-89754",
  "lastModified": "2026-09-13T07:17:39.837",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:20:06.387",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/895cd4ecbb2e03d7583103c65ee5adaae126ed6d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aedf2efd18977e0cef7eb963166e2b1fcc0aa321"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c05cdc2ab365b98099386e6c166b9865a4f2a9d3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-6J58-C7P9-8CJQ

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-13 09:32

Details

In the Linux kernel, the following vulnerability has been resolved:

mm/pagewalk: fix stale walk->action escaping walk_pmd_range()

If ->pmd_entry() sets walk->action = ACTION_AGAIN, the pmd_none() check is retried. The PMD entry may be cleared at the point of retry.

In this case, if walk->ops->install_pte is not specified, the code continues to the next PMD entry in the range without resetting walk->action to ACTION_SUBTREE.

This leaves walk->action erroneously set to ACTION_AGAIN, which is incorrect.

This was incorrect but not problematic up until commit 3b89863c3fa4 ("mm/pagewalk: fix race between concurrent split and refault") which updated walk_pud_range() to check for walk->action == ACTION_AGAIN upon walk_pmd_range()'s return, causing the PUD walk to be retried.

In this case this results in duplicate walk callbacks being invoked, which is erroneous and will break any caller that is not idempotent with respect to this (and waste time for those which are). The result is an out-of-bounds write, triggered by a local fuzzer:

[ 2.272695] ================================================================== [ 2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190 [ 2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106 [ 2.274966] [ 2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy) [ 2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.275164] Call Trace: [ 2.275170] [ 2.275172] dump_stack_lvl+0x53/0x70 [ 2.275200] print_report+0xd0/0x630 [ 2.275210] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 2.275219] ? irqentry_exit+0xd2/0x670 [ 2.275224] ? irqentry_exit+0xd2/0x670 [ 2.275226] ? __virt_addr_valid+0xef/0x1a0 [ 2.275239] ? __mincore_unmapped_range+0x14f/0x190 [ 2.275242] kasan_report+0xce/0x100 [ 2.275245] ? __mincore_unmapped_range+0x14f/0x190 [ 2.275248] __mincore_unmapped_range+0x14f/0x190 [ 2.275252] mincore_unmapped_range+0x45/0x70 [ 2.275254] walk_pgd_range+0xafc/0xfc0 [ 2.275261] ? __pfx_walk_pgd_range+0x10/0x10 [ 2.275264] ? __update_load_avg_se+0x3d1/0x670 [ 2.275275] __walk_page_range+0xc0/0x310 [ 2.275278] ? __pfx_find_vma+0x10/0x10 [ 2.275281] ? finish_task_switch.isra.0+0x16d/0x4f0 [ 2.275290] walk_page_range_mm_unsafe+0x26f/0x3a0 [ 2.275293] ? __pfx_mtree_load+0x10/0x10 [ 2.275298] ? __pfx_walk_page_range_mm_unsafe+0x10/0x10 [ 2.275302] ? __free_frozen_pages+0x54d/0x7e0 [ 2.275308] __do_sys_mincore+0x132/0x380 [ 2.275311] do_syscall_64+0xf9/0x540 [ 2.275316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 2.275322] RIP: 0033:0x422ccd [ 2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b [ 2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd [ 2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000 [ 2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100 [ 2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf [ 2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001 [ 2.275346] [ 2.275347] [ 2.296904] The buggy address belongs to the object at ffff888008d9b000 [ 2.296904] which belongs to the cache sigqueue of size 80 [ 2.298151] The buggy address is located 0 bytes inside of [ 2.298151] allocated 80-byte region [ffff888008d9b000, ffff888008d9b050) [ 2.299408] [ 2.299601] The buggy address belongs to the physical page: [ 2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b ---truncated---

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89754"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/pagewalk: fix stale walk-\u003eaction escaping walk_pmd_range()\n\nIf -\u003epmd_entry() sets walk-\u003eaction = ACTION_AGAIN, the pmd_none() check is\nretried.  The PMD entry may be cleared at the point of retry.\n\nIn this case, if walk-\u003eops-\u003einstall_pte is not specified, the code\ncontinues to the next PMD entry in the range without resetting\nwalk-\u003eaction to ACTION_SUBTREE.\n\nThis leaves walk-\u003eaction erroneously set to ACTION_AGAIN, which is\nincorrect.\n\nThis was incorrect but not problematic up until commit 3b89863c3fa4\n(\"mm/pagewalk: fix race between concurrent split and refault\") which\nupdated walk_pud_range() to check for walk-\u003eaction == ACTION_AGAIN upon\nwalk_pmd_range()\u0027s return, causing the PUD walk to be retried.\n\nIn this case this results in duplicate walk callbacks being invoked,\nwhich is erroneous and will break any caller that is not idempotent\nwith respect to this (and waste time for those which are).  The result\nis an out-of-bounds write, triggered by a local fuzzer:\n\n[    2.272695] ==================================================================\n[    2.273471] BUG: KASAN: slab-out-of-bounds in __mincore_unmapped_range+0x14f/0x190\n[    2.274302] Write of size 1 at addr ffff888008d9b000 by task poc/106\n[    2.274966]\n[    2.275154] CPU: 0 UID: 1000 PID: 106 Comm: poc Not tainted 7.2.0-rc6-00429-ga7c7074b58d2 #55 PREEMPT(lazy)\n[    2.275159] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[    2.275164] Call Trace:\n[    2.275170]  \u003cTASK\u003e\n[    2.275172]  dump_stack_lvl+0x53/0x70\n[    2.275200]  print_report+0xd0/0x630\n[    2.275210]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[    2.275219]  ? irqentry_exit+0xd2/0x670\n[    2.275224]  ? irqentry_exit+0xd2/0x670\n[    2.275226]  ? __virt_addr_valid+0xef/0x1a0\n[    2.275239]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275242]  kasan_report+0xce/0x100\n[    2.275245]  ? __mincore_unmapped_range+0x14f/0x190\n[    2.275248]  __mincore_unmapped_range+0x14f/0x190\n[    2.275252]  mincore_unmapped_range+0x45/0x70\n[    2.275254]  walk_pgd_range+0xafc/0xfc0\n[    2.275261]  ? __pfx_walk_pgd_range+0x10/0x10\n[    2.275264]  ? __update_load_avg_se+0x3d1/0x670\n[    2.275275]  __walk_page_range+0xc0/0x310\n[    2.275278]  ? __pfx_find_vma+0x10/0x10\n[    2.275281]  ? finish_task_switch.isra.0+0x16d/0x4f0\n[    2.275290]  walk_page_range_mm_unsafe+0x26f/0x3a0\n[    2.275293]  ? __pfx_mtree_load+0x10/0x10\n[    2.275298]  ? __pfx_walk_page_range_mm_unsafe+0x10/0x10\n[    2.275302]  ? __free_frozen_pages+0x54d/0x7e0\n[    2.275308]  __do_sys_mincore+0x132/0x380\n[    2.275311]  do_syscall_64+0xf9/0x540\n[    2.275316]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[    2.275322] RIP: 0033:0x422ccd\n[    2.275326] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\n[    2.275329] RSP: 002b:00007fffffffec18 EFLAGS: 00000287 ORIG_RAX: 000000000000001b\n[    2.275337] RAX: ffffffffffffffda RBX: 0000000000000066 RCX: 0000000000422ccd\n[    2.275339] RDX: 00000000004d0940 RSI: 0000000001000000 RDI: 00007ffff4000000\n[    2.275340] RBP: 00000000004d0940 R08: 0000000000000100 R09: 0000000000000100\n[    2.275342] R10: 0000000000000100 R11: 0000000000000287 R12: 20c49ba5e353f7cf\n[    2.275343] R13: 00000000004990d3 R14: 0000000000000000 R15: 0000000000000001\n[    2.275346]  \u003c/TASK\u003e\n[    2.275347]\n[    2.296904] The buggy address belongs to the object at ffff888008d9b000\n[    2.296904]  which belongs to the cache sigqueue of size 80\n[    2.298151] The buggy address is located 0 bytes inside of\n[    2.298151]  allocated 80-byte region [ffff888008d9b000, ffff888008d9b050)\n[    2.299408]\n[    2.299601] The buggy address belongs to the physical page:\n[    2.300191] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d9b\n---truncated---",
  "id": "GHSA-6j58-c7p9-8cjq",
  "modified": "2026-09-13T09:32:30Z",
  "published": "2026-09-11T21:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89754"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/895cd4ecbb2e03d7583103c65ee5adaae126ed6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aedf2efd18977e0cef7eb963166e2b1fcc0aa321"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c05cdc2ab365b98099386e6c166b9865a4f2a9d3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-89754 (GCVE-0-2026-89754)

FKIE_CVE-2026-89754

GHSA-6J58-C7P9-8CJQ

Tags

Sightings

Nomenclature