Answer in brief
CVE-2021-47254 records a High severity (CVSS 7.8) vulnerability in gfs2: Fix use-after-free in gfs2_glock_shrink_scan. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2021-47254 records a High severity (CVSS 7.8) vulnerability in gfs2: Fix use-after-free in gfs2_glock_shrink_scan. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6948c6bc17d666663a84c124b3176039e64a58f4 <38ce329534500bf4ae71f81df6a37a406cf187b4 || >=b568ed385a18c0ddbe41862b69088b636550a04f <92869945cc5b78ee8a1ef90336fe070893e3458a || >=762bb3528249604bc680a9df635e8995740176de <0364742decb0f02bc183404868b82896f7992595 || >=bac8520892812dada1ac93f27d96317470d24b1f <094bf5670e762afa243d2c41a5c4ab71c7447bf4 || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <a61156314b66456ab6a291ed5deba1ebd002ab3c || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <e87ef30fe73e7e10d2c85bdcc778dcec24dca553 || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 || 1e7a416fb765c9072479dc424780c0937ba99270 || dcbdbe13796ffa561510d2686a6318564e728bbd || >=4.4.181 <4.4.274 || >=4.9.180 <4.9.274 || >=4.14.123 <4.14.238 || >=4.19.47 <4.19.196 || >=5.0.20 <5.1 || >=5.1.6 <5.2 | 38ce329534500bf4ae71f81df6a37a406cf187b4, 92869945cc5b78ee8a1ef90336fe070893e3458a, 0364742decb0f02bc183404868b82896f7992595, 094bf5670e762afa243d2c41a5c4ab71c7447bf4, 86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d, a61156314b66456ab6a291ed5deba1ebd002ab3c, e87ef30fe73e7e10d2c85bdcc778dcec24dca553, 1ab19c5de4c537ec0d9b21020395a5b5a6c059b2, 4.4.274, 4.9.274, 4.14.238, 4.19.196, 5.1, 5.2 |
| Linux/Linuxgeneric | 5.2 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6948c6bc17d666663a84c124b3176039e64a58f4 <38ce329534500bf4ae71f81df6a37a406cf187b4 || >=b568ed385a18c0ddbe41862b69088b636550a04f <92869945cc5b78ee8a1ef90336fe070893e3458a || >=762bb3528249604bc680a9df635e8995740176de <0364742decb0f02bc183404868b82896f7992595 || >=bac8520892812dada1ac93f27d96317470d24b1f <094bf5670e762afa243d2c41a5c4ab71c7447bf4 || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <a61156314b66456ab6a291ed5deba1ebd002ab3c || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <e87ef30fe73e7e10d2c85bdcc778dcec24dca553 || >=7881ef3f33bb80f459ea6020d1e021fc524a6348 <1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 || 1e7a416fb765c9072479dc424780c0937ba99270 || dcbdbe13796ffa561510d2686a6318564e728bbd || >=4.4.181 <4.4.274 || >=4.9.180 <4.9.274 || >=4.14.123 <4.14.238 || >=4.19.47 <4.19.196 || >=5.0.20 <5.1 || >=5.1.6 <5.2 | 38ce329534500bf4ae71f81df6a37a406cf187b4, 92869945cc5b78ee8a1ef90336fe070893e3458a, 0364742decb0f02bc183404868b82896f7992595, 094bf5670e762afa243d2c41a5c4ab71c7447bf4, 86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d, a61156314b66456ab6a291ed5deba1ebd002ab3c, e87ef30fe73e7e10d2c85bdcc778dcec24dca553, 1ab19c5de4c537ec0d9b21020395a5b5a6c059b2, 4.4.274, 4.9.274, 4.14.238, 4.19.196, 5.1, 5.2 |
| Linux/Linuxgeneric | 5.2 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.