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GHSA-Q7GV-Q8JP-4PMJ

Vulnerability from github – Published: 2025-02-27 21:32 – Updated: 2025-02-27 21:32

Details

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

erofs: fix buffer copy overflow of ztailpacking feature

I got some KASAN report as below:

[ 46.959738] ================================================================== [ 46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188 ... [ 46.960430] Call Trace: [ 46.960430] [ 46.960430] dump_stack_lvl+0x41/0x5e [ 46.960430] print_report.cold+0xb2/0x6b7 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_report+0x8a/0x140 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_check_range+0x14d/0x1d0 [ 46.960430] memcpy+0x20/0x60 [ 46.960430] z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] z_erofs_decompress_pcluster+0xaae/0x1080

The root cause is that the tail pcluster won't be a complete filesystem block anymore. So if ztailpacking is used, the second part of an uncompressed tail pcluster may not be rq->pageofs_out.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49464"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:22Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix buffer copy overflow of ztailpacking feature\n\nI got some KASAN report as below:\n\n[   46.959738] ==================================================================\n[   46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188\n...\n[   46.960430] Call Trace:\n[   46.960430]  \u003cTASK\u003e\n[   46.960430]  dump_stack_lvl+0x41/0x5e\n[   46.960430]  print_report.cold+0xb2/0x6b7\n[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  kasan_report+0x8a/0x140\n[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  kasan_check_range+0x14d/0x1d0\n[   46.960430]  memcpy+0x20/0x60\n[   46.960430]  z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  z_erofs_decompress_pcluster+0xaae/0x1080\n\nThe root cause is that the tail pcluster won\u0027t be a complete filesystem\nblock anymore. So if ztailpacking is used, the second part of an\nuncompressed tail pcluster may not be ``rq-\u003epageofs_out``.",
  "id": "GHSA-q7gv-q8jp-4pmj",
  "modified": "2025-02-27T21:32:14Z",
  "published": "2025-02-27T21:32:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49464"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d53a625f29074e7b8236c2c0e0922edb7608df9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804b"
    }
  ],
  "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"
    }
  ]
}

CVE-2022-49464 (GCVE-0-2022-49464)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:13 – Updated: 2026-08-05 08:55

Title

erofs: fix buffer copy overflow of ztailpacking feature

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: fix buffer copy overflow of ztailpacking feature I got some KASAN report as below: [ 46.959738] ================================================================== [ 46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188 ... [ 46.960430] Call Trace: [ 46.960430] <TASK> [ 46.960430] dump_stack_lvl+0x41/0x5e [ 46.960430] print_report.cold+0xb2/0x6b7 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_report+0x8a/0x140 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_check_range+0x14d/0x1d0 [ 46.960430] memcpy+0x20/0x60 [ 46.960430] z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] z_erofs_decompress_pcluster+0xaae/0x1080 The root cause is that the tail pcluster won't be a complete filesystem block anymore. So if ztailpacking is used, the second part of an uncompressed tail pcluster may not be ``rq->pageofs_out``.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-27 18:16 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/4d53a625f29074e7b…
https://git.kernel.org/stable/c/6b59e1907f58cf877…
https://git.kernel.org/stable/c/dcbe6803fffd387f7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ab749badf9f41f32509cd103391b81ea7e684b76 , < 4d53a625f29074e7b8236c2c0e0922edb7608df9 (git) Affected: ab749badf9f41f32509cd103391b81ea7e684b76 , < 6b59e1907f58cf877c563dcf013159eb9f994b64 (git) Affected: ab749badf9f41f32509cd103391b81ea7e684b76 , < dcbe6803fffd387f72b48c2373b5f5ed12a5804b (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 5.17.14 , ≤ 5.17.* (semver) Unaffected: 5.18.3 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49464",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:16:06.988946Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-27T18:22:32.836Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4d53a625f29074e7b8236c2c0e0922edb7608df9",
              "status": "affected",
              "version": "ab749badf9f41f32509cd103391b81ea7e684b76",
              "versionType": "git"
            },
            {
              "lessThan": "6b59e1907f58cf877c563dcf013159eb9f994b64",
              "status": "affected",
              "version": "ab749badf9f41f32509cd103391b81ea7e684b76",
              "versionType": "git"
            },
            {
              "lessThan": "dcbe6803fffd387f72b48c2373b5f5ed12a5804b",
              "status": "affected",
              "version": "ab749badf9f41f32509cd103391b81ea7e684b76",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.14",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.3",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix buffer copy overflow of ztailpacking feature\n\nI got some KASAN report as below:\n\n[   46.959738] ==================================================================\n[   46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188\n...\n[   46.960430] Call Trace:\n[   46.960430]  \u003cTASK\u003e\n[   46.960430]  dump_stack_lvl+0x41/0x5e\n[   46.960430]  print_report.cold+0xb2/0x6b7\n[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  kasan_report+0x8a/0x140\n[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  kasan_check_range+0x14d/0x1d0\n[   46.960430]  memcpy+0x20/0x60\n[   46.960430]  z_erofs_shifted_transform+0x2bd/0x370\n[   46.960430]  z_erofs_decompress_pcluster+0xaae/0x1080\n\nThe root cause is that the tail pcluster won\u0027t be a complete filesystem\nblock anymore. So if ztailpacking is used, the second part of an\nuncompressed tail pcluster may not be ``rq-\u003epageofs_out``."
        }
      ],
      "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 - The bug is reached only via the local EROFS compressed read path (read/mmap/readahead \u2192 z_erofs_decompress_pcluster \u2192 z_erofs_shifted_transform) after a local block/file-backed mount; erofs has FS_REQUIRES_DEV and no network-protocol entry into the decompressor.\nAC:L - An image with ztailpacking and an uncompressed (SHIFTED) tail pcluster that is not a full filesystem block but spans two pages deterministically uses pageofs_out instead of lefthalf, so the oversized memcpy/memmove fires on ordinary reads with no race or attacker-uncontrollable condition.\nPR:L - Mounting erofs is not userns-capable, but on the worst-case deployment (already-mounted Android/embedded system images, or automounted/composefs/APEX images) any unprivileged local user with read access triggers decompression with no further capability check.\nUI:N - On typical EROFS deployments the filesystem is already mounted, and the attacker triggers the overflow entirely with their own reads; automounters and container/APEX image runtimes similarly mount attacker-supplied images without a separate interactive victim step.\nS:U - The OOB/UAF copy and resulting kernel memory corruption stay within the host kernel\u0027s security authority; no VM escape, IOMMU bypass, or other cross-boundary impact occurs.\nC:H - KASAN reports a use-after-free/out-of-bounds read of thousands of bytes that memcpy copies from adjacent/freed kernel memory into the file\u0027s page cache, which userspace can then read\u2014an arbitrary kernel-memory disclosure per OOB-read/UAF guidance.\nI:H - The same overflow is a buffer copy overflow (oversized memcpy into the output page and memmove that can write past the inline source page when pageofs_in+pageofs_out exceeds PAGE_SIZE), and UAF/OOB write class corruption enables control-flow hijacking per kernel guidance.\nA:H - The demonstrated KASAN use-after-free/out-of-bounds access can oops or panic the kernel even when not fully exploited, which is Availability High under kernel CVSS guidance."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:16.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4d53a625f29074e7b8236c2c0e0922edb7608df9"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804b"
        }
      ],
      "title": "erofs: fix buffer copy overflow of ztailpacking feature",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49464",
    "datePublished": "2025-02-26T02:13:10.321Z",
    "dateReserved": "2025-02-26T02:08:31.577Z",
    "dateUpdated": "2026-08-05T08:55:16.048Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.

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GHSA-Q7GV-Q8JP-4PMJ

CVE-2022-49464 (GCVE-0-2022-49464)

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