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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-47254

gfs2: Fix use-after-free in gfs2_glock_shrink_scan

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 6948c6bc17d666663a84c124b3176039e64a58f4 to < 38ce329534500bf4ae71f81df6a37a406cf187b4affected
  • b568ed385a18c0ddbe41862b69088b636550a04f to < 92869945cc5b78ee8a1ef90336fe070893e3458aaffected
  • 762bb3528249604bc680a9df635e8995740176de to < 0364742decb0f02bc183404868b82896f7992595affected
  • bac8520892812dada1ac93f27d96317470d24b1f to < 094bf5670e762afa243d2c41a5c4ab71c7447bf4affected
  • 7881ef3f33bb80f459ea6020d1e021fc524a6348 to < 86fd5b27db743a0ce0cc245e3a34813b2aa6ec1daffected
  • 7881ef3f33bb80f459ea6020d1e021fc524a6348 to < a61156314b66456ab6a291ed5deba1ebd002ab3caffected
  • 7881ef3f33bb80f459ea6020d1e021fc524a6348 to < e87ef30fe73e7e10d2c85bdcc778dcec24dca553affected
  • 7881ef3f33bb80f459ea6020d1e021fc524a6348 to < 1ab19c5de4c537ec0d9b21020395a5b5a6c059b2affected
  • 1e7a416fb765c9072479dc424780c0937ba99270affected
  • dcbdbe13796ffa561510d2686a6318564e728bbdaffected
  • 4.4.181 to < 4.4.274affected
  • 4.9.180 to < 4.9.274affected
  • 4.14.123 to < 4.14.238affected
  • 4.19.47 to < 4.19.196affected
  • 5.0.20 to < 5.1affected
  • 5.1.6 to < 5.2affected

Linux Linux

Default version status: affected

  • 5.2affected
  • 0 to < 5.2unaffected
  • 4.4.274 to ≤ 4.4.*unaffected
  • 4.9.274 to ≤ 4.9.*unaffected
  • 4.14.238 to ≤ 4.14.*unaffected
  • 4.19.196 to ≤ 4.19.*unaffected
  • 5.4.127 to ≤ 5.4.*unaffected
  • 5.10.45 to ≤ 5.10.*unaffected
  • 5.12.12 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References