{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-57929", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-19T11:50:08.376Z", "datePublished": "2025-01-19T11:52:46.096Z", "dateUpdated": "2026-08-05T11:46:57.657Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:46:57.657Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm array: fix releasing a faulty array block twice in dm_array_cursor_end\n\nWhen dm_bm_read_lock() fails due to locking or checksum errors, it\nreleases the faulty block implicitly while leaving an invalid output\npointer behind. The caller of dm_bm_read_lock() should not operate on\nthis invalid dm_block pointer, or it will lead to undefined result.\nFor example, the dm_array_cursor incorrectly caches the invalid pointer\non reading a faulty array block, causing a double release in\ndm_array_cursor_end(), then hitting the BUG_ON in dm-bufio cache_put().\n\nReproduce steps:\n\n1. initialize a cache device\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc $262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\n2. wipe the second array block offline\n\ndmsteup remove cache cmeta cdata corig\nmapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\nablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\ndd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock\n\n3. try reopen the cache device\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc $262144\"\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\nKernel logs:\n\n(snip)\ndevice-mapper: array: array_block_check failed: blocknr 0 != wanted 10\ndevice-mapper: block manager: array validator check failed for block 10\ndevice-mapper: array: get_ablock failed\ndevice-mapper: cache metadata: dm_array_cursor_next for mapping failed\n------------[ cut here ]------------\nkernel BUG at drivers/md/dm-bufio.c:638!\n\nFix by setting the cached block pointer to NULL on errors.\n\nIn addition to the reproducer described above, this fix can be\nverified using the \"array_cursor/damaged\" test in dm-unit:\n dm-unit run /pdata/array_cursor/damaged --kernel-dir " } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached through the device-mapper control ioctl path (dm-cache/dm-era table load and resume) combined with attacker-supplied on-disk metadata on a local block device — no network protocol is involved.\nAC:L - The commit's own reproducer is fully deterministic: zero one array block on the metadata device and reactivate the cache target. There is no race to win and no memory-layout condition outside the attacker's control.\nPR:L - The malformed data is on-disk metadata, so an attacker only needs write access to the backing store (loop file, removable/USB media, iSCSI/NBD target, container- or VM-exposed block device) that a dm-cache/dm-era stack is built on, not administrative rights over the metadata content itself.\nUI:N - Activation of the affected target is routine device management (udev/LVM autoactivation, boot, or reattachment of the backing store) and requires no deliberate action by a victim once the corrupt metadata is in place.\nS:U - The corruption is confined to kernel dm-bufio metadata buffers within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `dm_block` pointer underflows the dm-bufio buffer's `hold_count`, letting a still-referenced metadata buffer be evicted, freed, and reallocated — a use-after-free that exposes freed slab contents and on-disk metadata to whoever next reads through the dangling reference.\nI:H - The same refcount underflow yields a write primitive: `bl_up_read()`/`cache_put()` mutate the released buffer, and a freed-and-reused `dm_buffer` is subsequently written through (dirty marking, `b->c` dereference), which is exploitable for heap corruption.\nA:H - The observed outcome is `kernel BUG at drivers/md/dm-bufio.c:638` — a BUG_ON taken while the bufio cache read lock is held, so the task dies with the lock permanently leaked and all subsequent metadata I/O on that client deadlocks." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/persistent-data/dm-array.c" ], "versions": [ { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "9c7c03d0e926762adf3a3a0ba86156fb5e19538b", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "fc1ef07c3522e257e32702954f265debbcb096a7", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "738994872d77e189b2d13c501a1d145e95d98f46", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "e477021d252c007f0c6d45b5d13d341efed03979", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "6002bec5354f86d1a2df21468f68e3ec03ede9da", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "017c4470bff53585370028fec9341247bad358ff", "status": "affected", "versionType": "git" }, { "version": "fdd1315aa5f022fe6574efdc2d9535f75a0ee255", "lessThan": "f2893c0804d86230ffb8f1c8703fdbb18648abc8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/persistent-data/dm-array.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.290", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.234", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.177", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.125", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.72", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.10", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.4.290" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.234" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.177" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.125" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.6.72" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9c7c03d0e926762adf3a3a0ba86156fb5e19538b" }, { "url": "https://git.kernel.org/stable/c/fc1ef07c3522e257e32702954f265debbcb096a7" }, { "url": "https://git.kernel.org/stable/c/738994872d77e189b2d13c501a1d145e95d98f46" }, { "url": "https://git.kernel.org/stable/c/e477021d252c007f0c6d45b5d13d341efed03979" }, { "url": "https://git.kernel.org/stable/c/6002bec5354f86d1a2df21468f68e3ec03ede9da" }, { "url": "https://git.kernel.org/stable/c/017c4470bff53585370028fec9341247bad358ff" }, { "url": "https://git.kernel.org/stable/c/f2893c0804d86230ffb8f1c8703fdbb18648abc8" } ], "title": "dm array: fix releasing a faulty array block twice in dm_array_cursor_end", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:55:57.853Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:01:39.001Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" } ] } ] } }