cve-2021-47541
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2024-12-19 07:44
Severity ?
EPSS score ?
0.02% (0.0304)
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv(). After that mlx4_en_alloc_resources() is called and there is a dereference of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use after free problem on failure of mlx4_en_copy_priv(). Fix this bug by adding a check of mlx4_en_copy_priv() This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_MLX4_EN=m show no new warnings, and our static analyzer no longer warns about this code.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2bPatch
Impacted products
Vendor Product Version
Linux Linux Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
Version: ec25bc04ed8e12947738468cbe2191f1529f9e39
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   Linux Linux Version: 4.7
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\"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.257\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.220\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.164\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/mellanox/mlx4/en_netdev.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757\"}, {\"url\": \"https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275\"}, {\"url\": \"https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68\"}, {\"url\": \"https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b\"}, {\"url\": \"https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18\"}, {\"url\": \"https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()\\n\\nIn mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and\\ntmp->tx_cq will be freed on the error path of mlx4_en_copy_priv().\\nAfter that mlx4_en_alloc_resources() is called and there is a dereference\\nof &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to\\na use after free problem on failure of mlx4_en_copy_priv().\\n\\nFix this bug by adding a check of mlx4_en_copy_priv()\\n\\nThis bug was found by a static analyzer. The analysis employs\\ndifferential checking to identify inconsistent security operations\\n(e.g., checks or kfrees) between two code paths and confirms that the\\ninconsistent operations are not recovered in the current function or\\nthe callers, so they constitute bugs.\\n\\nNote that, as a bug found by static analysis, it can be a false\\npositive or hard to trigger. Multiple researchers have cross-reviewed\\nthe bug.\\n\\nBuilds with CONFIG_MLX4_EN=m show no new warnings,\\nand our static analyzer no longer warns about this code.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:44:29.387Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2021-47541\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:44:29.387Z\", \"dateReserved\": \"2024-05-24T15:02:54.829Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:47.916Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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