CVE-2021-47254 (GCVE-0-2021-47254)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-21 08:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6948c6bc17d666663a84c124b3176039e64a58f4
Version: b568ed385a18c0ddbe41862b69088b636550a04f
Version: 762bb3528249604bc680a9df635e8995740176de
Version: bac8520892812dada1ac93f27d96317470d24b1f
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 1e7a416fb765c9072479dc424780c0937ba99270
Version: dcbdbe13796ffa561510d2686a6318564e728bbd
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\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.0.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.1.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:31:40.360Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47254\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:31:40.360Z\", \"dateReserved\": \"2024-04-10T18:59:19.539Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:49.475Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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