Vulnerability-Lookup

CVE-2026-93800 (GCVE-0-2026-93800)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:02 – Updated: 2026-10-03 10:57

Title

btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol() If during relocation we fail in insert_dirty_subvol() because btrfs_update_reloc_root() returned an error, we will leave a root's reloc_root field pointing to a reloc root that was freed instead of NULL, resulting later in a use-after-free, or double free attempt during unmount. The sequence of steps is this: 1) During relocation the call to btrfs_update_reloc_root() in insert_dirty_subvol() fails, so insert_dirty_subvol() returns the error to merge_reloc_root() without adding the root to the list rc->dirty_subvol_roots; 2) Then merge_reloc_root() aborts the current transaction because insert_dirty_subvol() returned an error; 3) Up the call chain, merge_reloc_roots() gets the error, adds the reloc root for root X to the local reloc_roots list and jumps to the 'out' label, where it calls free_reloc_roots() to free all the reloc roots in the local reloc_roots list. This frees the reloc root for root X; 4) We go up the call chain to relocate_block_group() which calls clean_dirty_subvols() to go over dirty roots and set their ->reloc_root field to NULL, but root X is not in the dirty_subvol_roots list, so its ->reloc_root still points to a reloc root; 5) Relocation finishes, with an error and a transaction abort, but the ->reloc_root field for root X still points to the reloc root that was freed in step 3; 6) When unmounting the fs we end up calling: btrfs_free_fs_roots() btrfs_drop_and_free_fs_root() --> calls btrfs_put_root() against root X's ->reloc_root which is not NULL and points to the already freed reloc root in step 4 above Resulting in a use-after-free to a double free attempt. Syzbot reported this with the following dmesg/syslog: [ 106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5) [ 106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure [ 106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5 [ 106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction. [ 106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0 [ 106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure [ 106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly [ 106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure [ 106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1 [ 106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30 [ 106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30 [ 106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409 [ 106.682946][ T5338] ================================================================== [ 106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250 [ 106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338 [ 106.693173][ T5338] [ 106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.694300][ T5338] Call Trace: [ 106.694308][ T5338] <TASK> [ 106.694314][ T5338] dump_stack_lvl+0xe8/0x150 [ 106.694331][ T5338] print_address_description+0x55/0x1e0 [ 106.694343][ T5338] ? btrfs_put_root+0x2f/0x250 [ 106.694358][ T5338] print_report+0x58/0x70 [ 106. ---truncated---

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/5a247097c5f94b51f…
https://git.kernel.org/stable/c/6372dd394ea907cd8…
https://git.kernel.org/stable/c/9f599d120b2b79d2d…
https://git.kernel.org/stable/c/a01837ae174a2a968…
https://git.kernel.org/stable/c/97a540d72ebcb2185…
https://git.kernel.org/stable/c/fda1b6636ff1846f0…
https://git.kernel.org/stable/c/83201804efa4a5168…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: f32b84d7c977e1906a4781b93b3c93090b6cd675 , < 5a247097c5f94b51ffc991b444d998ad6e85875f (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < 6372dd394ea907cd85a7a8063db320ec73dfaed0 (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < 9f599d120b2b79d2d937c3935b7cdf2697514283 (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < a01837ae174a2a968c245a30e6dd010f50eaf05d (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < 97a540d72ebcb21853d11f2a56782fe377f358e7 (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < fda1b6636ff1846f00643e791099db5564b547d9 (git) Affected: 592fbcd50c99b8adf999a2a54f9245caff333139 , < 83201804efa4a5168be754e1dfc9b2faee760cac (git) Affected: aa18bc1ff8a51f082d5b3b6d07693797637b4028 (git) Affected: 4cb0aea2e250eee35ccfac5f5395cd8f3238a9e5 (git) Affected: 5.10.36 , < 5.10.271 (semver) Affected: 5.11.20 , < 5.12 (semver) Affected: 5.12.3 , < 5.13 (semver)	guessed
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
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              "status": "affected",
              "version": "5.12.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "5.10.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.11.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.12.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()\n\nIf during relocation we fail in insert_dirty_subvol() because\nbtrfs_update_reloc_root() returned an error, we will leave a root\u0027s\nreloc_root field pointing to a reloc root that was freed instead of NULL,\nresulting later in a use-after-free, or double free attempt during\nunmount.\n\nThe sequence of steps is this:\n\n1) During relocation the call to btrfs_update_reloc_root() in\n   insert_dirty_subvol() fails, so insert_dirty_subvol() returns the\n   error to merge_reloc_root() without adding the root to the list\n   rc-\u003edirty_subvol_roots;\n\n2) Then merge_reloc_root() aborts the current transaction because\n   insert_dirty_subvol() returned an error;\n\n3) Up the call chain, merge_reloc_roots() gets the error, adds the\n   reloc root for root X to the local reloc_roots list and jumps to the\n   \u0027out\u0027 label, where it calls free_reloc_roots() to free all the reloc\n   roots in the local reloc_roots list. This frees the reloc root for\n   root X;\n\n4) We go up the call chain to relocate_block_group() which calls\n   clean_dirty_subvols() to go over dirty roots and set their\n   -\u003ereloc_root field to NULL, but root X is not in the dirty_subvol_roots\n   list, so its -\u003ereloc_root still points to a reloc root;\n\n5) Relocation finishes, with an error and a transaction abort, but the\n   -\u003ereloc_root field for root X still points to the reloc root that was\n   freed in step 3;\n\n6) When unmounting the fs we end up calling:\n\n     btrfs_free_fs_roots()\n        btrfs_drop_and_free_fs_root()\n           --\u003e calls btrfs_put_root() against root X\u0027s -\u003ereloc_root\n               which is not NULL and points to the already freed\n               reloc root in step 4 above\n\n  Resulting in a use-after-free to a double free attempt.\n\nSyzbot reported this with the following dmesg/syslog:\n\n   [  106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5)\n   [  106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure\n   [  106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5\n   [  106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction.\n   [  106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0\n   [  106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure\n   [  106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly\n   [  106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure\n   [  106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1\n   [  106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30\n   [  106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30\n   [  106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409\n   [  106.682946][ T5338] ==================================================================\n   [  106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250\n   [  106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338\n   [  106.693173][ T5338]\n   [  106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\n   [  106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n   [  106.694300][ T5338] Call Trace:\n   [  106.694308][ T5338]  \u003cTASK\u003e\n   [  106.694314][ T5338]  dump_stack_lvl+0xe8/0x150\n   [  106.694331][ T5338]  print_address_description+0x55/0x1e0\n   [  106.694343][ T5338]  ? btrfs_put_root+0x2f/0x250\n   [  106.694358][ T5338]  print_report+0x58/0x70\n   [  106.\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:57:34.733Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5a247097c5f94b51ffc991b444d998ad6e85875f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6372dd394ea907cd85a7a8063db320ec73dfaed0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f599d120b2b79d2d937c3935b7cdf2697514283"
        },
        {
          "url": "https://git.kernel.org/stable/c/a01837ae174a2a968c245a30e6dd010f50eaf05d"
        },
        {
          "url": "https://git.kernel.org/stable/c/97a540d72ebcb21853d11f2a56782fe377f358e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/fda1b6636ff1846f00643e791099db5564b547d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/83201804efa4a5168be754e1dfc9b2faee760cac"
        }
      ],
      "title": "btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93800",
    "datePublished": "2026-09-24T16:02:34.370Z",
    "dateReserved": "2026-09-18T17:59:28.789Z",
    "dateUpdated": "2026-10-03T10:57:34.733Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-93800",
      "date": "2026-11-14",
      "epss": "0.00173",
      "percentile": "0.0678"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-15T02:54:24.000Z",
      "cve": "CVE-2026-93800",
      "id": "msrc_CVE-2026-93800",
      "initial_release_date": "2026-09-28T02:17:54.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93800.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
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                ],
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                    "versionType": "git"
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                  {
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                    "version": "5.11.20",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.13",
                    "status": "affected",
                    "version": "5.12.3",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/btrfs/relocation.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.13"
                  },
                  {
                    "lessThan": "5.13",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.271",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.222",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.189",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "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\nbtrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()\n\nIf during relocation we fail in insert_dirty_subvol() because\nbtrfs_update_reloc_root() returned an error, we will leave a root\u0027s\nreloc_root field pointing to a reloc root that was freed instead of NULL,\nresulting later in a use-after-free, or double free attempt during\nunmount.\n\nThe sequence of steps is this:\n\n1) During relocation the call to btrfs_update_reloc_root() in\n   insert_dirty_subvol() fails, so insert_dirty_subvol() returns the\n   error to merge_reloc_root() without adding the root to the list\n   rc-\u003edirty_subvol_roots;\n\n2) Then merge_reloc_root() aborts the current transaction because\n   insert_dirty_subvol() returned an error;\n\n3) Up the call chain, merge_reloc_roots() gets the error, adds the\n   reloc root for root X to the local reloc_roots list and jumps to the\n   \u0027out\u0027 label, where it calls free_reloc_roots() to free all the reloc\n   roots in the local reloc_roots list. This frees the reloc root for\n   root X;\n\n4) We go up the call chain to relocate_block_group() which calls\n   clean_dirty_subvols() to go over dirty roots and set their\n   -\u003ereloc_root field to NULL, but root X is not in the dirty_subvol_roots\n   list, so its -\u003ereloc_root still points to a reloc root;\n\n5) Relocation finishes, with an error and a transaction abort, but the\n   -\u003ereloc_root field for root X still points to the reloc root that was\n   freed in step 3;\n\n6) When unmounting the fs we end up calling:\n\n     btrfs_free_fs_roots()\n        btrfs_drop_and_free_fs_root()\n           --\u003e calls btrfs_put_root() against root X\u0027s -\u003ereloc_root\n               which is not NULL and points to the already freed\n               reloc root in step 4 above\n\n  Resulting in a use-after-free to a double free attempt.\n\nSyzbot reported this with the following dmesg/syslog:\n\n   [  106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5)\n   [  106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure\n   [  106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5\n   [  106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction.\n   [  106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0\n   [  106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure\n   [  106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly\n   [  106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure\n   [  106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1\n   [  106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30\n   [  106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30\n   [  106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409\n   [  106.682946][ T5338] ==================================================================\n   [  106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250\n   [  106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338\n   [  106.693173][ T5338]\n   [  106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\n   [  106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n   [  106.694300][ T5338] Call Trace:\n   [  106.694308][ T5338]  \u003cTASK\u003e\n   [  106.694314][ T5338]  dump_stack_lvl+0xe8/0x150\n   [  106.694331][ T5338]  print_address_description+0x55/0x1e0\n   [  106.694343][ T5338]  ? btrfs_put_root+0x2f/0x250\n   [  106.694358][ T5338]  print_report+0x58/0x70\n   [  106.\n---truncated---"
          }
        ],
        "id": "CVE-2026-93800",
        "lastModified": "2026-10-03T11:17:49.673",
        "metrics": {},
        "published": "2026-09-24T17:17:12.870",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5a247097c5f94b51ffc991b444d998ad6e85875f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6372dd394ea907cd85a7a8063db320ec73dfaed0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/83201804efa4a5168be754e1dfc9b2faee760cac"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/97a540d72ebcb21853d11f2a56782fe377f358e7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9f599d120b2b79d2d937c3935b7cdf2697514283"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a01837ae174a2a968c245a30e6dd010f50eaf05d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fda1b6636ff1846f00643e791099db5564b547d9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:11:38+00:00",
      "cve": "CVE-2026-93800",
      "id": "CVE-2026-93800",
      "initial_release_date": "2026-09-24T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "199",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93800.json",
      "version": "3"
    }
  }
}

GHSA-WPW6-8CM9-72WV

Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-10-03 12:31

Details

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

btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()

If during relocation we fail in insert_dirty_subvol() because btrfs_update_reloc_root() returned an error, we will leave a root's reloc_root field pointing to a reloc root that was freed instead of NULL, resulting later in a use-after-free, or double free attempt during unmount.

The sequence of steps is this:

1) During relocation the call to btrfs_update_reloc_root() in insert_dirty_subvol() fails, so insert_dirty_subvol() returns the error to merge_reloc_root() without adding the root to the list rc->dirty_subvol_roots;

2) Then merge_reloc_root() aborts the current transaction because insert_dirty_subvol() returned an error;

3) Up the call chain, merge_reloc_roots() gets the error, adds the reloc root for root X to the local reloc_roots list and jumps to the 'out' label, where it calls free_reloc_roots() to free all the reloc roots in the local reloc_roots list. This frees the reloc root for root X;

4) We go up the call chain to relocate_block_group() which calls clean_dirty_subvols() to go over dirty roots and set their ->reloc_root field to NULL, but root X is not in the dirty_subvol_roots list, so its ->reloc_root still points to a reloc root;

5) Relocation finishes, with an error and a transaction abort, but the ->reloc_root field for root X still points to the reloc root that was freed in step 3;

6) When unmounting the fs we end up calling:

 btrfs_free_fs_roots()
    btrfs_drop_and_free_fs_root()
       --> calls btrfs_put_root() against root X's ->reloc_root
           which is not NULL and points to the already freed
           reloc root in step 4 above

Resulting in a use-after-free to a double free attempt.

Syzbot reported this with the following dmesg/syslog:

[ 106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5) [ 106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure [ 106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5 [ 106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction. [ 106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0 [ 106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure [ 106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly [ 106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure [ 106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1 [ 106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30 [ 106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30 [ 106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409 [ 106.682946][ T5338] ================================================================== [ 106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250 [ 106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338 [ 106.693173][ T5338] [ 106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.694300][ T5338] Call Trace: [ 106.694308][ T5338] [ 106.694314][ T5338] dump_stack_lvl+0xe8/0x150 [ 106.694331][ T5338] print_address_description+0x55/0x1e0 [ 106.694343][ T5338] ? btrfs_put_root+0x2f/0x250 [ 106.694358][ T5338] print_report+0x58/0x70 [ 106. ---truncated---

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-93800"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T17:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()\n\nIf during relocation we fail in insert_dirty_subvol() because\nbtrfs_update_reloc_root() returned an error, we will leave a root\u0027s\nreloc_root field pointing to a reloc root that was freed instead of NULL,\nresulting later in a use-after-free, or double free attempt during\nunmount.\n\nThe sequence of steps is this:\n\n1) During relocation the call to btrfs_update_reloc_root() in\n   insert_dirty_subvol() fails, so insert_dirty_subvol() returns the\n   error to merge_reloc_root() without adding the root to the list\n   rc-\u003edirty_subvol_roots;\n\n2) Then merge_reloc_root() aborts the current transaction because\n   insert_dirty_subvol() returned an error;\n\n3) Up the call chain, merge_reloc_roots() gets the error, adds the\n   reloc root for root X to the local reloc_roots list and jumps to the\n   \u0027out\u0027 label, where it calls free_reloc_roots() to free all the reloc\n   roots in the local reloc_roots list. This frees the reloc root for\n   root X;\n\n4) We go up the call chain to relocate_block_group() which calls\n   clean_dirty_subvols() to go over dirty roots and set their\n   -\u003ereloc_root field to NULL, but root X is not in the dirty_subvol_roots\n   list, so its -\u003ereloc_root still points to a reloc root;\n\n5) Relocation finishes, with an error and a transaction abort, but the\n   -\u003ereloc_root field for root X still points to the reloc root that was\n   freed in step 3;\n\n6) When unmounting the fs we end up calling:\n\n     btrfs_free_fs_roots()\n        btrfs_drop_and_free_fs_root()\n           --\u003e calls btrfs_put_root() against root X\u0027s -\u003ereloc_root\n               which is not NULL and points to the already freed\n               reloc root in step 4 above\n\n  Resulting in a use-after-free to a double free attempt.\n\nSyzbot reported this with the following dmesg/syslog:\n\n   [  106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5)\n   [  106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure\n   [  106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5\n   [  106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction.\n   [  106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0\n   [  106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure\n   [  106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly\n   [  106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure\n   [  106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1\n   [  106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30\n   [  106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30\n   [  106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409\n   [  106.682946][ T5338] ==================================================================\n   [  106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250\n   [  106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338\n   [  106.693173][ T5338]\n   [  106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\n   [  106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n   [  106.694300][ T5338] Call Trace:\n   [  106.694308][ T5338]  \u003cTASK\u003e\n   [  106.694314][ T5338]  dump_stack_lvl+0xe8/0x150\n   [  106.694331][ T5338]  print_address_description+0x55/0x1e0\n   [  106.694343][ T5338]  ? btrfs_put_root+0x2f/0x250\n   [  106.694358][ T5338]  print_report+0x58/0x70\n   [  106.\n---truncated---",
  "id": "GHSA-wpw6-8cm9-72wv",
  "modified": "2026-10-03T12:31:09Z",
  "published": "2026-09-24T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a247097c5f94b51ffc991b444d998ad6e85875f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6372dd394ea907cd85a7a8063db320ec73dfaed0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83201804efa4a5168be754e1dfc9b2faee760cac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97a540d72ebcb21853d11f2a56782fe377f358e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f599d120b2b79d2d937c3935b7cdf2697514283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a01837ae174a2a968c245a30e6dd010f50eaf05d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fda1b6636ff1846f00643e791099db5564b547d9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-93800

Vulnerability from csaf_microsoft - Published: 2026-09-28 02:17 - Updated: 2026-10-15 02:54

Summary

btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()

Scope

1 vulnerability in this advisory, including CVE-2026-93800.

CVE-2026-93800

Fixed: 1 product Known affected: 1 product

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:22091-1

Vulnerability from csaf_opensuse - Published: 2026-10-12 15:44 - Updated: 2026-11-10 16:03

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 136 products

Open the full advisory

OPENSUSE-SU-2026:22309-1

Vulnerability from csaf_opensuse - Published: 2026-11-09 18:11 - Updated: 2026-11-13 19:22

Summary

Security update for the Linux Kernel

Severity

Important

Scope

2819 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 136 products

Open the full advisory

OPENSUSE-SU-2026:22313-1

Vulnerability from csaf_opensuse - Published: 2026-10-29 23:47 - Updated: 2026-11-13 19:22

Summary

Security update for the Linux Kernel

Severity

Important

Scope

740 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 12 products

Open the full advisory

SUSE-SU-2026:24179-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:24 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 8 products

Open the full advisory

SUSE-SU-2026:24184-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:51 - Updated: 2026-10-20 09:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:24197-1

Vulnerability from csaf_suse - Published: 2026-10-12 14:15 - Updated: 2026-10-21 11:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 9 products

Open the full advisory

SUSE-SU-2026:24235-1

Vulnerability from csaf_suse - Published: 2026-10-12 13:51 - Updated: 2026-10-21 11:50

Summary

Security update for the Linux Kernel

Severity

Important

Scope

401 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 114 products

Open the full advisory

SUSE-SU-2026:24371-1

Vulnerability from csaf_suse - Published: 2026-10-21 12:21 - Updated: 2026-11-04 21:51

Summary

Security update for the Linux Kernel

Severity

Important

Scope

98 vulnerabilities in this advisory, including CVE-2026-93800.

CVE-2026-93800

4.4 (Medium)


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

Recommended: 11 products

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-93800 (GCVE-0-2026-93800)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour