{"id":"CVE-2024-47736","state":"PUBLISHED","title":"erofs: handle overlapped pclusters out of crafted images properly","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: handle overlapped pclusters out of crafted images properly\n\nsyzbot reported a task hang issue due to a deadlock case where it is\nwaiting for the folio lock of a cached folio that will be used for\ncache I/Os.\n\nAfter looking into the crafted fuzzed image, I found it's formed with\nseveral overlapped big pclusters as below:\n\n Ext:   logical offset   |  length :     physical offset    |  length\n   0:        0..   16384 |   16384 :     151552..    167936 |   16384\n   1:    16384..   32768 |   16384 :     155648..    172032 |   16384\n   2:    32768..   49152 |   16384 :  537223168.. 537239552 |   16384\n...\n\nHere, extent 0/1 are physically overlapped although it's entirely\n_impossible_ for normal filesystem images generated by mkfs.\n\nFirst, managed folios containing compressed data will be marked as\nup-to-date and then unlocked immediately (unlike in-place folios) when\ncompressed I/Os are complete.  If physical blocks are not submitted in\nthe incremental order, there should be separate BIOs to avoid dependency\nissues.  However, the current code mis-arranges z_erofs_fill_bio_vec()\nand BIO submission which causes unexpected BIO waits.\n\nSecond, managed folios will be connected to their own pclusters for\nefficient inter-queries.  However, this is somewhat hard to implement\neasily if overlapped big pclusters exist.  Again, these only appear in\nfuzzed images so let's simply fall back to temporary short-lived pages\nfor correctness.\n\nAdditionally, it justifies that referenced managed folios cannot be\ntruncated for now and reverts part of commit 2080ca1ed3e4 (\"erofs: tidy\nup `struct z_erofs_bvec`\") for simplicity although it shouldn't be any\ndifference.","publishedAt":"2024-10-21T12:14:06.530Z","updatedAt":"2026-10-15T00:52:52.336Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8e6c8fa9f2e95c88a642521a5da19a8e31748846","status":"affected","lessThan":"c1172e65aad4b115392ea4c6e61e56e5b9b69df4","versionType":"git"},{"version":"8e6c8fa9f2e95c88a642521a5da19a8e31748846","status":"affected","lessThan":"1bf7e414cac303c9aec1be67872e19be8b64980c","versionType":"git"},{"version":"8e6c8fa9f2e95c88a642521a5da19a8e31748846","status":"affected","lessThan":"b9b30af0e86ffb485301ecd83b9129c9dfb7ebf8","versionType":"git"},{"version":"8e6c8fa9f2e95c88a642521a5da19a8e31748846","status":"affected","lessThan":"9cfa199bcbbbba31cbf97b2786f44f4464f3f29a","versionType":"git"},{"version":"8e6c8fa9f2e95c88a642521a5da19a8e31748846","status":"affected","lessThan":"9e2f9d34dd12e6e5b244ec488bcebd0c2d566c50","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.13","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11.2","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]}],"references":["https://git.kernel.org/stable/c/c1172e65aad4b115392ea4c6e61e56e5b9b69df4","https://git.kernel.org/stable/c/1bf7e414cac303c9aec1be67872e19be8b64980c","https://git.kernel.org/stable/c/b9b30af0e86ffb485301ecd83b9129c9dfb7ebf8","https://git.kernel.org/stable/c/9cfa199bcbbbba31cbf97b2786f44f4464f3f29a","https://git.kernel.org/stable/c/9e2f9d34dd12e6e5b244ec488bcebd0c2d566c50","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:56.516Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/47xxx/CVE-2024-47736.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-47736","state":"PUBLISHED","datePublished":"2024-10-21T12:14:06.530Z","dateUpdated":"2026-10-15T00:52:52.336Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-09-30T16:00:12.958Z"},"containers":{"cna":{"title":"erofs: handle overlapped pclusters out of crafted images properly","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: handle overlapped pclusters out of crafted images properly\n\nsyzbot reported a task hang issue due to a deadlock case where it is\nwaiting for the folio lock of a cached folio that will be used for\ncache I/Os.\n\nAfter looking into the crafted fuzzed image, I found it's formed with\nseveral overlapped big pclusters as below:\n\n Ext:   logical offset   |  length :     physical offset    |  length\n   0:        0..   16384 |   16384 :     151552..    167936 |   16384\n   1:    16384..   32768 |   16384 :     155648..    172032 |   16384\n   2:    32768..   49152 |   16384 :  537223168.. 537239552 |   16384\n...\n\nHere, extent 0/1 are physically overlapped although it's entirely\n_impossible_ for normal filesystem images generated by mkfs.\n\nFirst, managed folios containing compressed data will be marked as\nup-to-date and then unlocked immediately (unlike in-place folios) when\ncompressed I/Os are complete.  If physical blocks are not submitted in\nthe incremental order, there should be separate BIOs to avoid dependency\nissues.  However, the current code mis-arranges z_erofs_fill_bio_vec()\nand BIO submission which causes unexpected BIO waits.\n\nSecond, managed folios will be connected to their own pclusters for\nefficient inter-queries.  However, this is somewhat hard to implement\neasily if overlapped big pclusters exist.  Again, these only appear in\nfuzzed images so let's simply fall back to temporary short-lived pages\nfor correctness.\n\nAdditionally, it justifies that referenced managed folios cannot be\ntruncated for now and reverts part of commit 2080ca1ed3e4 (\"erofs: tidy\nup `struct z_erofs_bvec`\") for simplicity although it shouldn't be 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