CVE-2026-97605 (GCVE-0-2026-97605)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-21 12:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: preserve LZMA decoders on resize failure The pool-resize path frees each stream's old decoder before allocating its replacement. If an allocation fails after some streams have already been replaced, the failed stream is put back on the list with state == NULL. z_erofs_lzma_max_dictsize is still advanced as if the whole pool had been resized. An existing LZMA mount can select the broken stream and pass NULL to xz_dec_microlzma_reset(). A retry at the same size also skip another resize attempt. Since the global maximum was advanced, thus, the invalid state is left unrepaired. Allocate each replacement before freeing the old decoder, temporarily retaining one old decoder during allocation. Stop at the first failure and advance z_erofs_lzma_max_dictsize only after all streams satisfy the request. Record each stream's dictionary capacity so retries can skip streams already enlarged before a partial failure.
References
Impacted products
Vendor Product Version
Linux Linux Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor_lzma.c"
          ],
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        },
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          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor_lzma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: preserve LZMA decoders on resize failure\n\nThe pool-resize path frees each stream\u0027s old decoder before allocating\nits replacement. If an allocation fails after some streams have already\nbeen replaced, the failed stream is put back on the list with state ==\nNULL. z_erofs_lzma_max_dictsize is still advanced as if the whole\npool had been resized.\n\nAn existing LZMA mount can select the broken stream and pass\nNULL to xz_dec_microlzma_reset(). A retry at the same size also\nskip another resize attempt. Since the global maximum was advanced,\nthus, the invalid state is left unrepaired.\n\nAllocate each replacement before freeing the old decoder, temporarily\nretaining one old decoder during allocation. Stop at the first failure\nand advance z_erofs_lzma_max_dictsize only after all streams satisfy\nthe request.\n\nRecord each stream\u0027s dictionary capacity so retries can skip streams\nalready enlarged before a partial failure."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:53:25.795Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/db0c3465b54a16debc089b2b3bda251d26c953d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/604ce546e1b9f35b1f45588004f53fac6b2869c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b3c8c39e50249470f00a5f73c288b95a55ab576"
        },
        {
          "url": "https://git.kernel.org/stable/c/38e9e07ac02a9453a117410776f1502a9980997e"
        },
        {
          "url": "https://git.kernel.org/stable/c/617d0d8d199ba1790c94310fd75a22d01c97a8d6"
        }
      ],
      "title": "erofs: preserve LZMA decoders on resize failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97605",
    "datePublished": "2026-09-25T10:22:17.233Z",
    "dateReserved": "2026-09-24T16:01:01.158Z",
    "dateUpdated": "2026-10-21T12:53:25.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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