cve-2024-26689
Vulnerability from cvelistv5
Published
2024-04-03 14:54
Modified
2024-12-19 08:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5efPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5efPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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This\\nimplies before the refcount could be increment here, it was freed.\\n\\nIn same file, in \\\"handle_cap_grant()\\\" refcount is decremented by this\\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\\noccurred and resource was freed by the latter line before the former\\nline could increment it.\\n\\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\\nthe refcount must be increased to prevent \\\"use after free\\\" error.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:45:08.529Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26689\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:45:08.529Z\", \"dateReserved\": \"2024-02-19T14:20:24.154Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:54:50.885Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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