CVE-2022-49890 (GCVE-0-2022-49890)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2025-10-01 16:08
VLAI?
Title
capabilities: fix potential memleak on error path from vfs_getxattr_alloc()
Summary
In the Linux kernel, the following vulnerability has been resolved: capabilities: fix potential memleak on error path from vfs_getxattr_alloc() In cap_inode_getsecurity(), we will use vfs_getxattr_alloc() to complete the memory allocation of tmpbuf, if we have completed the memory allocation of tmpbuf, but failed to call handler->get(...), there will be a memleak in below logic: |-- ret = (int)vfs_getxattr_alloc(mnt_userns, ...) | /* ^^^ alloc for tmpbuf */ |-- value = krealloc(*xattr_value, error + 1, flags) | /* ^^^ alloc memory */ |-- error = handler->get(handler, ...) | /* error! */ |-- *xattr_value = value | /* xattr_value is &tmpbuf (memory leak!) */ So we will try to free(tmpbuf) after vfs_getxattr_alloc() fails to fix it. [PM: subject line and backtrace tweaks]
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 6bb00eb21c0fbf18e5d3538c9ff0cf63fd0ace85 (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 90577bcc01c4188416a47269f8433f70502abe98 (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 0c3e6288da650d1ec911a259c77bc2d88e498603 (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < cdf01c807e974048c43c7fd3ca574f6086a57906 (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 2de8eec8afb75792440b8900a01d52b8f6742fd1 (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 7480aeff0093d8c54377553ec6b31110bea37b4d (git)
Affected: 8db6c34f1dbc8e06aa016a9b829b06902c3e1340 , < 8cf0a1bc12870d148ae830a4ba88cfdf0e879cee (git)
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    Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 4.14.299 , ≤ 4.14.* (semver)
Unaffected: 4.19.265 , ≤ 4.19.* (semver)
Unaffected: 5.4.224 , ≤ 5.4.* (semver)
Unaffected: 5.10.154 , ≤ 5.10.* (semver)
Unaffected: 5.15.78 , ≤ 5.15.* (semver)
Unaffected: 6.0.8 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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\"lessThan\": \"cdf01c807e974048c43c7fd3ca574f6086a57906\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8db6c34f1dbc8e06aa016a9b829b06902c3e1340\", \"lessThan\": \"2de8eec8afb75792440b8900a01d52b8f6742fd1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8db6c34f1dbc8e06aa016a9b829b06902c3e1340\", \"lessThan\": \"7480aeff0093d8c54377553ec6b31110bea37b4d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8db6c34f1dbc8e06aa016a9b829b06902c3e1340\", \"lessThan\": \"8cf0a1bc12870d148ae830a4ba88cfdf0e879cee\", \"versionType\": \"git\"}], \"programFiles\": [\"security/commoncap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.299\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.224\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"security/commoncap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/6bb00eb21c0fbf18e5d3538c9ff0cf63fd0ace85\"}, {\"url\": \"https://git.kernel.org/stable/c/90577bcc01c4188416a47269f8433f70502abe98\"}, {\"url\": \"https://git.kernel.org/stable/c/0c3e6288da650d1ec911a259c77bc2d88e498603\"}, {\"url\": \"https://git.kernel.org/stable/c/cdf01c807e974048c43c7fd3ca574f6086a57906\"}, {\"url\": \"https://git.kernel.org/stable/c/2de8eec8afb75792440b8900a01d52b8f6742fd1\"}, {\"url\": \"https://git.kernel.org/stable/c/7480aeff0093d8c54377553ec6b31110bea37b4d\"}, {\"url\": \"https://git.kernel.org/stable/c/8cf0a1bc12870d148ae830a4ba88cfdf0e879cee\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncapabilities: fix potential memleak on error path from vfs_getxattr_alloc()\\n\\nIn cap_inode_getsecurity(), we will use vfs_getxattr_alloc() to\\ncomplete the memory allocation of tmpbuf, if we have completed\\nthe memory allocation of tmpbuf, but failed to call handler-\u003eget(...),\\nthere will be a memleak in below logic:\\n\\n  |-- ret = (int)vfs_getxattr_alloc(mnt_userns, ...)\\n    |           /* ^^^ alloc for tmpbuf */\\n    |-- value = krealloc(*xattr_value, error + 1, flags)\\n    |           /* ^^^ alloc memory */\\n    |-- error = handler-\u003eget(handler, ...)\\n    |           /* error! */\\n    |-- *xattr_value = value\\n    |           /* xattr_value is \u0026tmpbuf (memory leak!) */\\n\\nSo we will try to free(tmpbuf) after vfs_getxattr_alloc() fails to fix it.\\n\\n[PM: subject line and backtrace tweaks]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.299\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.265\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.224\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.154\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.78\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.8\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"4.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:47:53.416Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49890\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T16:08:36.059Z\", \"dateReserved\": \"2025-05-01T14:05:17.242Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-05-01T14:10:34.481Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.