CVE-2024-49882 (GCVE-0-2024-49882)
Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-08-05 11:40
VLAI
EPSS
VEX
Title
ext4: fix double brelse() the buffer of the extents path
Summary
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix double brelse() the buffer of the extents path
In ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been
released, otherwise it may be released twice. An example of what triggers
this is as follows:
split2 map split1
|--------|-------|--------|
ext4_ext_map_blocks
ext4_ext_handle_unwritten_extents
ext4_split_convert_extents
// path->p_depth == 0
ext4_split_extent
// 1. do split1
ext4_split_extent_at
|ext4_ext_insert_extent
| ext4_ext_create_new_leaf
| ext4_ext_grow_indepth
| le16_add_cpu(&neh->eh_depth, 1)
| ext4_find_extent
| // return -ENOMEM
|// get error and try zeroout
|path = ext4_find_extent
| path->p_depth = 1
|ext4_ext_try_to_merge
| ext4_ext_try_to_merge_up
| path->p_depth = 0
| brelse(path[1].p_bh) ---> not set to NULL here
|// zeroout success
// 2. update path
ext4_find_extent
// 3. do split2
ext4_split_extent_at
ext4_ext_insert_extent
ext4_ext_create_new_leaf
ext4_ext_grow_indepth
le16_add_cpu(&neh->eh_depth, 1)
ext4_find_extent
path[0].p_bh = NULL;
path->p_depth = 1
read_extent_tree_block ---> return err
// path[1].p_bh is still the old value
ext4_free_ext_path
ext4_ext_drop_refs
// path->p_depth == 1
brelse(path[1].p_bh) ---> brelse a buffer twice
Finally got the following WARRNING when removing the buffer from lru:
============================================
VFS: brelse: Trying to free free buffer
WARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90
CPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716
RIP: 0010:__brelse+0x58/0x90
Call Trace:
<TASK>
__find_get_block+0x6e7/0x810
bdev_getblk+0x2b/0x480
__ext4_get_inode_loc+0x48a/0x1240
ext4_get_inode_loc+0xb2/0x150
ext4_reserve_inode_write+0xb7/0x230
__ext4_mark_inode_dirty+0x144/0x6a0
ext4_ext_insert_extent+0x9c8/0x3230
ext4_ext_map_blocks+0xf45/0x2dc0
ext4_map_blocks+0x724/0x1700
ext4_do_writepages+0x12d6/0x2a70
[...]
============================================
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:45 UTC
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < d4574bda63906bf69660e001470bfe1a0ac524ae
(git)
Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < f9fd47c9d9548f9e47fa60098eab99dde175401d (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 32bbb59e3f18facd7201bef110010bf35819b8c3 (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 78bbc3d15b6f443acb26e94418c445bac940d414 (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 68a69cf60660c73990c1875f94a5551600b04775 (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 7633407ca4ab8be2916ab214eb44ccebc6a50e1a (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < 230ee0535d01478bad9a3037292043f39b9be10b (git) Affected: ecb94f5fdf4b72547fca022421a9dca1672bddd4 , < dcaa6c31134c0f515600111c38ed7750003e1b9c (git) |
guessed | |
| Linux | Linux |
Affected:
3.7
Unaffected: 0 , < 3.7 (semver) Unaffected: 4.19.323 , ≤ 4.19.* (semver) Unaffected: 5.4.285 , ≤ 5.4.* (semver) Unaffected: 5.10.227 , ≤ 5.10.* (semver) Unaffected: 5.15.168 , ≤ 5.15.* (semver) Unaffected: 6.1.113 , ≤ 6.1.* (semver) Unaffected: 6.6.55 , ≤ 6.6.* (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix double brelse() the buffer of the extents path\n\nIn ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been\nreleased, otherwise it may be released twice. An example of what triggers\nthis is as follows:\n\n split2 map split1\n|--------|-------|--------|\n\next4_ext_map_blocks\n ext4_ext_handle_unwritten_extents\n ext4_split_convert_extents\n // path-\u003ep_depth == 0\n ext4_split_extent\n // 1. do split1\n ext4_split_extent_at\n |ext4_ext_insert_extent\n | ext4_ext_create_new_leaf\n | ext4_ext_grow_indepth\n | le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\n | ext4_find_extent\n | // return -ENOMEM\n |// get error and try zeroout\n |path = ext4_find_extent\n | path-\u003ep_depth = 1\n |ext4_ext_try_to_merge\n | ext4_ext_try_to_merge_up\n | path-\u003ep_depth = 0\n | brelse(path[1].p_bh) ---\u003e not set to NULL here\n |// zeroout success\n // 2. update path\n ext4_find_extent\n // 3. do split2\n ext4_split_extent_at\n ext4_ext_insert_extent\n ext4_ext_create_new_leaf\n ext4_ext_grow_indepth\n le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\n ext4_find_extent\n path[0].p_bh = NULL;\n path-\u003ep_depth = 1\n read_extent_tree_block ---\u003e return err\n // path[1].p_bh is still the old value\n ext4_free_ext_path\n ext4_ext_drop_refs\n // path-\u003ep_depth == 1\n brelse(path[1].p_bh) ---\u003e brelse a buffer twice\n\nFinally got the following WARRNING when removing the buffer from lru:\n\n============================================\nVFS: brelse: Trying to free free buffer\nWARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90\nCPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716\nRIP: 0010:__brelse+0x58/0x90\nCall Trace:\n \u003cTASK\u003e\n __find_get_block+0x6e7/0x810\n bdev_getblk+0x2b/0x480\n __ext4_get_inode_loc+0x48a/0x1240\n ext4_get_inode_loc+0xb2/0x150\n ext4_reserve_inode_write+0xb7/0x230\n __ext4_mark_inode_dirty+0x144/0x6a0\n ext4_ext_insert_extent+0x9c8/0x3230\n ext4_ext_map_blocks+0xf45/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n============================================"
}
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"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable extent-split path is reached through ordinary local file operations (fallocate + write/writeback, ZERO_RANGE, punch hole) on a mounted ext4 filesystem, requiring local system access rather than any network protocol handler.\nAC:L - The attacker fully drives both stages \u2014 creating unwritten extents and splitting them at will \u2014 and can force the required allocation/IO failure deterministically via an attacker-controlled backing device (-EIO), a crafted extent block (-EFSCORRUPTED), or self-inflicted GFP_NOFS memory pressure (-ENOMEM), so no condition lies outside the attacker\u0027s influence.\nPR:L - Only an unprivileged local account with write access to any file on an ext4 filesystem (/tmp, /home, an Android app sandbox on /data, a container writable layer) is needed; no capability, root, or namespace escalation is involved.\nUI:N - The attacker performs fallocate() and writes entirely on their own files and can force writeback via fsync(); no victim action such as mounting an image or opening a file is required.\nS:U - The corruption is confined to kernel memory and filesystem metadata within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stolen buffer_head reference lets a live bh and its folio be freed while still in use, yielding a slab use-after-free whose recycled object contents (b_data, b_page, b_end_io) can be read back, and it can drop a refcount on an unrelated inode\u0027s metadata buffer, exposing arbitrary page-cache contents.\nI:H - The refcount underflow produces a use-after-free on a bh_cachep object containing the b_end_io function pointer and list pointers, giving heap-spray-based write and control-flow-hijack primitives, plus corruption of another inode\u0027s on-disk metadata buffer.\nA:H - The bug reproducibly triggers a WARN in __brelse() (fatal with panic_on_warn) and, in the reference-stealing case, a use-after-free that oopses the kernel and corrupts filesystem metadata, causing a full system crash."
}
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"title": "ext4: fix double brelse() the buffer of the extents path",
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"datePublished": "2024-10-21T18:01:20.144Z",
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"cve": "CVE-2024-49882",
"date": "2026-09-17",
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"microsoft_vex": {
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"cve": "CVE-2024-49882",
"id": "msrc_CVE-2024-49882",
"initial_release_date": "2024-10-01T07:00:00.000Z",
"product_status:fixed": "5",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ext4: fix double brelse() the buffer of the extents path",
"url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-49882.json",
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"nvd": "{\"cve\":{\"id\":\"CVE-2024-49882\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:10.790\",\"lastModified\":\"2026-08-04T11:20:55.380\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix double brelse() the buffer of the extents path\\n\\nIn ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been\\nreleased, otherwise it may be released twice. An example of what triggers\\nthis is as follows:\\n\\n split2 map split1\\n|--------|-------|--------|\\n\\next4_ext_map_blocks\\n ext4_ext_handle_unwritten_extents\\n ext4_split_convert_extents\\n // path-\u003ep_depth == 0\\n ext4_split_extent\\n // 1. do split1\\n ext4_split_extent_at\\n |ext4_ext_insert_extent\\n | ext4_ext_create_new_leaf\\n | ext4_ext_grow_indepth\\n | le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\\n | ext4_find_extent\\n | // return -ENOMEM\\n |// get error and try zeroout\\n |path = ext4_find_extent\\n | path-\u003ep_depth = 1\\n |ext4_ext_try_to_merge\\n | ext4_ext_try_to_merge_up\\n | path-\u003ep_depth = 0\\n | brelse(path[1].p_bh) ---\u003e not set to NULL here\\n |// zeroout success\\n // 2. update path\\n ext4_find_extent\\n // 3. do split2\\n ext4_split_extent_at\\n ext4_ext_insert_extent\\n ext4_ext_create_new_leaf\\n ext4_ext_grow_indepth\\n le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\\n ext4_find_extent\\n path[0].p_bh = NULL;\\n path-\u003ep_depth = 1\\n read_extent_tree_block ---\u003e return err\\n // path[1].p_bh is still the old value\\n ext4_free_ext_path\\n ext4_ext_drop_refs\\n // path-\u003ep_depth == 1\\n brelse(path[1].p_bh) ---\u003e brelse a buffer twice\\n\\nFinally got the following WARRNING when removing the buffer from lru:\\n\\n============================================\\nVFS: brelse: Trying to free free buffer\\nWARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90\\nCPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716\\nRIP: 0010:__brelse+0x58/0x90\\nCall Trace:\\n \u003cTASK\u003e\\n __find_get_block+0x6e7/0x810\\n bdev_getblk+0x2b/0x480\\n __ext4_get_inode_loc+0x48a/0x1240\\n ext4_get_inode_loc+0xb2/0x150\\n ext4_reserve_inode_write+0xb7/0x230\\n __ext4_mark_inode_dirty+0x144/0x6a0\\n ext4_ext_insert_extent+0x9c8/0x3230\\n ext4_ext_map_blocks+0xf45/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n============================================\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corregir el doble brelse() del b\u00fafer de la ruta de las extensiones En ext4_ext_try_to_merge_up(), establezca path[1].p_bh en NULL despu\u00e9s de que se haya liberado, de lo contrario, puede liberarse dos veces. Un ejemplo de lo que desencadena esto es el siguiente: split2 map split1 |--------|-------|--------| ext4_ext_map_blocks ext4_ext_handle_unwritten_extents ext4_split_convert_extents // path-\u0026gt;p_depth == 0 ext4_split_extent // 1. hacer split1 ext4_split_extent_at |ext4_ext_insert_extent | ext4_ext_create_new_leaf | ext4_ext_grow_indepth | le16_add_cpu(\u0026amp;neh-\u0026gt;eh_depth, 1) | ext4_find_extent | // devuelve -ENOMEM |// obtiene el error e intenta poner a cero |path = ext4_find_extent | path-\u0026gt;p_depth = 1 |ext4_ext_try_to_merge | ext4_ext_try_to_merge_up | path-\u0026gt;p_depth = 0 | brelse(path[1].p_bh) ---\u0026gt; no establecido en NULL aqu\u00ed |// puesta a cero exitosa // 2. actualizar ruta ext4_find_extent // 3. hacer split2 ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth le16_add_cpu(\u0026amp;neh-\u0026gt;eh_depth, 1) ext4_find_extent path[0].p_bh = NULL; path-\u0026gt;p_depth = 1 read_extent_tree_block ---\u0026gt; return err // path[1].p_bh sigue siendo el valor anterior ext4_free_ext_path ext4_ext_drop_refs // path-\u0026gt;p_depth == 1 brelse(path[1].p_bh) ---\u0026gt; brelse un buffer dos veces Finalmente obtuve la siguiente ADVERTENCIA al eliminar el buffer de lru: =============================================== VFS: brelse: Intentando liberar b\u00fafer libre ADVERTENCIA: CPU: 2 PID: 72 en fs/buffer.c:1241 __brelse+0x58/0x90 CPU: 2 PID: 72 Comm: kworker/u19:1 No contaminado 6.9.0-dirty #716 RIP: 0010:__brelse+0x58/0x90 Seguimiento de llamadas: __find_get_block+0x6e7/0x810 bdev_getblk+0x2b/0x480 __ext4_get_inode_loc+0x48a/0x1240 ext4_get_inode_loc+0xb2/0x150 ext4_reserve_inode_write+0xb7/0x230 __ext4_mark_inode_dirty+0x144/0x6a0 ext4_ext_insert_extent+0x9c8/0x3230 ext4_ext_map_blocks+0xf45/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ============================================\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ext4/extents.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"d4574bda63906bf69660e001470bfe1a0ac524ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"f9fd47c9d9548f9e47fa60098eab99dde175401d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"32bbb59e3f18facd7201bef110010bf35819b8c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"78bbc3d15b6f443acb26e94418c445bac940d414\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"68a69cf60660c73990c1875f94a5551600b04775\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"7633407ca4ab8be2916ab214eb44ccebc6a50e1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"230ee0535d01478bad9a3037292043f39b9be10b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ecb94f5fdf4b72547fca022421a9dca1672bddd4\",\"lessThan\":\"dcaa6c31134c0f515600111c38ed7750003e1b9c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ext4/extents.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.323\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.285\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.227\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.168\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.113\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.55\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10.14\",\"lessThanOrEqual\":\"6.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.3\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-22T13:45:30.617937Z\",\"id\":\"CVE-2024-49882\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-13T15:08:01+00:00",
"cve": "CVE-2024-49882",
"id": "CVE-2024-49882",
"initial_release_date": "2024-10-21T00:00:00+00:00",
"product_status:fixed": "305",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ext4: fix double brelse() the buffer of the extents path",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49882.json",
"version": "3"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:22:48.090Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49882\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:45:30.617937Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:45:33.703Z\"}}], \"cna\": {\"title\": \"ext4: fix double brelse() the buffer of the extents path\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"d4574bda63906bf69660e001470bfe1a0ac524ae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"f9fd47c9d9548f9e47fa60098eab99dde175401d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"32bbb59e3f18facd7201bef110010bf35819b8c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"78bbc3d15b6f443acb26e94418c445bac940d414\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"68a69cf60660c73990c1875f94a5551600b04775\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"7633407ca4ab8be2916ab214eb44ccebc6a50e1a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"230ee0535d01478bad9a3037292043f39b9be10b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecb94f5fdf4b72547fca022421a9dca1672bddd4\", \"lessThan\": \"dcaa6c31134c0f515600111c38ed7750003e1b9c\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/extents.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d4574bda63906bf69660e001470bfe1a0ac524ae\"}, {\"url\": \"https://git.kernel.org/stable/c/f9fd47c9d9548f9e47fa60098eab99dde175401d\"}, {\"url\": \"https://git.kernel.org/stable/c/b6c29c8f3d7cb67b505f3b2f6c242d52298d1f2e\"}, {\"url\": \"https://git.kernel.org/stable/c/32bbb59e3f18facd7201bef110010bf35819b8c3\"}, {\"url\": \"https://git.kernel.org/stable/c/78bbc3d15b6f443acb26e94418c445bac940d414\"}, {\"url\": \"https://git.kernel.org/stable/c/68a69cf60660c73990c1875f94a5551600b04775\"}, {\"url\": \"https://git.kernel.org/stable/c/7633407ca4ab8be2916ab214eb44ccebc6a50e1a\"}, {\"url\": \"https://git.kernel.org/stable/c/230ee0535d01478bad9a3037292043f39b9be10b\"}, {\"url\": \"https://git.kernel.org/stable/c/dcaa6c31134c0f515600111c38ed7750003e1b9c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix double brelse() the buffer of the extents path\\n\\nIn ext4_ext_try_to_merge_up(), set path[1].p_bh to NULL after it has been\\nreleased, otherwise it may be released twice. An example of what triggers\\nthis is as follows:\\n\\n split2 map split1\\n|--------|-------|--------|\\n\\next4_ext_map_blocks\\n ext4_ext_handle_unwritten_extents\\n ext4_split_convert_extents\\n // path-\u003ep_depth == 0\\n ext4_split_extent\\n // 1. do split1\\n ext4_split_extent_at\\n |ext4_ext_insert_extent\\n | ext4_ext_create_new_leaf\\n | ext4_ext_grow_indepth\\n | le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\\n | ext4_find_extent\\n | // return -ENOMEM\\n |// get error and try zeroout\\n |path = ext4_find_extent\\n | path-\u003ep_depth = 1\\n |ext4_ext_try_to_merge\\n | ext4_ext_try_to_merge_up\\n | path-\u003ep_depth = 0\\n | brelse(path[1].p_bh) ---\u003e not set to NULL here\\n |// zeroout success\\n // 2. update path\\n ext4_find_extent\\n // 3. do split2\\n ext4_split_extent_at\\n ext4_ext_insert_extent\\n ext4_ext_create_new_leaf\\n ext4_ext_grow_indepth\\n le16_add_cpu(\u0026neh-\u003eeh_depth, 1)\\n ext4_find_extent\\n path[0].p_bh = NULL;\\n path-\u003ep_depth = 1\\n read_extent_tree_block ---\u003e return err\\n // path[1].p_bh is still the old value\\n ext4_free_ext_path\\n ext4_ext_drop_refs\\n // path-\u003ep_depth == 1\\n brelse(path[1].p_bh) ---\u003e brelse a buffer twice\\n\\nFinally got the following WARRNING when removing the buffer from lru:\\n\\n============================================\\nVFS: brelse: Trying to free free buffer\\nWARNING: CPU: 2 PID: 72 at fs/buffer.c:1241 __brelse+0x58/0x90\\nCPU: 2 PID: 72 Comm: kworker/u19:1 Not tainted 6.9.0-dirty #716\\nRIP: 0010:__brelse+0x58/0x90\\nCall Trace:\\n \u003cTASK\u003e\\n __find_get_block+0x6e7/0x810\\n bdev_getblk+0x2b/0x480\\n __ext4_get_inode_loc+0x48a/0x1240\\n ext4_get_inode_loc+0xb2/0x150\\n ext4_reserve_inode_write+0xb7/0x230\\n __ext4_mark_inode_dirty+0x144/0x6a0\\n ext4_ext_insert_extent+0x9c8/0x3230\\n ext4_ext_map_blocks+0xf45/0x2dc0\\n ext4_map_blocks+0x724/0x1700\\n ext4_do_writepages+0x12d6/0x2a70\\n[...]\\n============================================\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:40:17.799Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-49882\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:22:48.090Z\", \"dateReserved\": \"2024-10-21T12:17:06.021Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:20.144Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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