CVE-2024-49983 (GCVE-0-2024-49983)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40
VLAI
Title
ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(), the 'ppath' is updated but it is the 'path' that is freed, thus potentially triggering a double-free in the following process: ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(&ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path) ---> path First freed *orig_path = path = NULL ---> null ppath kfree(path) ---> path double-free !!! So drop the unnecessary ppath and use path directly to avoid this problem. And use ext4_find_extent() directly to update path, avoiding unnecessary memory allocation and freeing. Also, propagate the error returned by ext4_find_extent() instead of using strange error codes.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 8c26d9e53e5fbacda0732a577e97c5a5b7882aaf (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < a34bed978364114390162c27e50fca50791c568d (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 6367d3f04c69e2b8770b8137bd800e0784b0abbc (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 1b558006d98b7b0b730027be0ee98973dd10ee0d (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 3ff710662e8d86a63a39b334e9ca0cb10e5c14b0 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 63adc9016917e6970fb0104ee5fd6770f02b2d80 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95 (git)
Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (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)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\n\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\ntriggering a double-free in the following process:\n\next4_ext_replay_update_ex\n  ppath = path\n  ext4_force_split_extent_at(\u0026ppath)\n    ext4_split_extent_at\n      ext4_ext_insert_extent\n        ext4_ext_create_new_leaf\n          ext4_ext_grow_indepth\n            ext4_find_extent\n              if (depth \u003e path[0].p_maxdepth)\n                kfree(path)                 ---\u003e path First freed\n                *orig_path = path = NULL    ---\u003e null ppath\n  kfree(path)                               ---\u003e path double-free !!!\n\nSo drop the unnecessary ppath and use path directly to avoid this problem.\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\nmemory allocation and freeing. Also, propagate the error returned by\next4_find_extent() instead of using strange error codes."
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\\n\\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\\ntriggering a double-free in the following process:\\n\\next4_ext_replay_update_ex\\n  ppath = path\\n  ext4_force_split_extent_at(\u0026ppath)\\n    ext4_split_extent_at\\n      ext4_ext_insert_extent\\n        ext4_ext_create_new_leaf\\n          ext4_ext_grow_indepth\\n            ext4_find_extent\\n              if (depth \u003e path[0].p_maxdepth)\\n                kfree(path)                 ---\u003e path First freed\\n                *orig_path = path = NULL    ---\u003e null ppath\\n  kfree(path)                               ---\u003e path double-free !!!\\n\\nSo drop the unnecessary ppath and use path directly to avoid this problem.\\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\\nmemory allocation and freeing. Also, propagate the error returned by\\next4_find_extent() instead of using strange error codes.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: eliminar ppath de ext4_ext_replay_update_ex() para evitar una doble liberaci\\u00f3n Al llamar a ext4_force_split_extent_at() en ext4_ext_replay_update_ex(), se actualiza \u0027ppath\u0027 pero es \u0027path\u0027 el que se libera, lo que potencialmente desencadena una doble liberaci\\u00f3n en el siguiente proceso: ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(\u0026amp;ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth \u0026gt; path[0].p_maxdepth) kfree(path) ---\u0026gt; path Primero liberado *orig_path = path = NULL ---\u0026gt; null ppath kfree(path) ---\u0026gt; path double-free !!! Por lo tanto, elimine el ppath innecesario y use path directamente para evitar este problema. Y use ext4_find_extent() directamente para actualizar path, evitando la asignaci\\u00f3n y liberaci\\u00f3n de memoria innecesaria. Adem\\u00e1s, propague el error devuelto por ext4_find_extent() en lugar de usar c\\u00f3digos de error extra\\u00f1os.\"}]",
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      "published": "2024-10-21T18:15:18.797",
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      "cve": "CVE-2024-49983",
      "id": "msrc_CVE-2024-49983",
      "initial_release_date": "2024-10-01T07:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-49983.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49983\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:18.797\",\"lastModified\":\"2026-08-04T11:21:05.523\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\\n\\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\\ntriggering a double-free in the following process:\\n\\next4_ext_replay_update_ex\\n  ppath = path\\n  ext4_force_split_extent_at(\u0026ppath)\\n    ext4_split_extent_at\\n      ext4_ext_insert_extent\\n        ext4_ext_create_new_leaf\\n          ext4_ext_grow_indepth\\n            ext4_find_extent\\n              if (depth \u003e path[0].p_maxdepth)\\n                kfree(path)                 ---\u003e path First freed\\n                *orig_path = path = NULL    ---\u003e null ppath\\n  kfree(path)                               ---\u003e path double-free !!!\\n\\nSo drop the unnecessary ppath and use path directly to avoid this problem.\\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\\nmemory allocation and freeing. Also, propagate the error returned by\\next4_find_extent() instead of using strange error codes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: eliminar ppath de ext4_ext_replay_update_ex() para evitar una doble liberaci\u00f3n Al llamar a ext4_force_split_extent_at() en ext4_ext_replay_update_ex(), se actualiza \u0027ppath\u0027 pero es \u0027path\u0027 el que se libera, lo que potencialmente desencadena una doble liberaci\u00f3n en el siguiente proceso: ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(\u0026amp;ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth \u0026gt; path[0].p_maxdepth) kfree(path) ---\u0026gt; path Primero liberado *orig_path = path = NULL ---\u0026gt; null ppath kfree(path) ---\u0026gt; path double-free !!! Por lo tanto, elimine el ppath innecesario y use path directamente para evitar este problema. Y use ext4_find_extent() directamente para actualizar path, evitando la asignaci\u00f3n y liberaci\u00f3n de memoria innecesaria. Adem\u00e1s, propague el error devuelto por ext4_find_extent() en lugar de usar c\u00f3digos de error extra\u00f1os.\"}],\"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\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"8c26d9e53e5fbacda0732a577e97c5a5b7882aaf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"a34bed978364114390162c27e50fca50791c568d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"6367d3f04c69e2b8770b8137bd800e0784b0abbc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"1b558006d98b7b0b730027be0ee98973dd10ee0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"3ff710662e8d86a63a39b334e9ca0cb10e5c14b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"63adc9016917e6970fb0104ee5fd6770f02b2d80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\",\"lessThan\":\"5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95\",\"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\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"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\":\"2024-10-22T13:32:15.569255Z\",\"id\":\"CVE-2024-49983\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"658E9248-9CAC-4A1E-A483-039DF6CCAF8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T17:47:34+00:00",
      "cve": "CVE-2024-49983",
      "id": "CVE-2024-49983",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49983.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-23T01:57:27Z",
      "cve": "CVE-2024-49983",
      "id": "CVE-2024-49983",
      "initial_release_date": "2024-10-24T03:18:11Z",
      "product_status:known_affected": "426",
      "product_status:known_not_affected": "233",
      "product_status:recommended": "681",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-49983",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-49983.json",
      "version": "62"
    },
    "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\": \"2025-11-03T22:24:05.400Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49983\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:32:15.569255Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:32:18.790Z\"}}], \"cna\": {\"title\": \"ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The only entry point is `mount(2)` on a locally-attached block device holding an ext4 image whose journal carries an unreplayed fast-commit area; `ext4_ext_replay_update_ex()` has no callers outside `ext4_fc_replay_add_range()`, so there is no network- or adjacent-reachable path.\\nAC:L - The attacker authors the entire image, so the extent-tree depth, the ADD_RANGE records and the corrupted extent block that makes the inner `ext4_find_extent()` fail are all chosen deterministically \\u2014 no race and no memory-layout dependency outside attacker control, and standard slab grooming decides what reclaims the freed `kmalloc-N` object.\\nPR:L - ext4 lacks `FS_USERNS_MOUNT` so `mount(2)` itself wants CAP_SYS_ADMIN, but an ordinary local user reaches the identical replay path by attaching removable media that udisks2/autofs mounts automatically, or via a `user` fstab entry \\u2014 the standard crafted-ext4-image threat model on kiosks, workstations and embedded devices.\\nUI:N - The attacker performs the mount themselves, either directly or by inserting media whose automount is unattended, so no action by a separate victim user is needed.\\nS:U - The freed object, the stale dereferences and the corrupted slab freelist all live in the kernel\u0027s own memory and security authority; no hypervisor, IOMMU or sandbox boundary is crossed.\\nC:H - `ext4_free_ext_path()` on the dangling pointer reads `p_depth` and every `p_bh` field back out of the already-freed, potentially reclaimed slab object, so attacker-groomed content is dereferenced as `struct buffer_head *` \\u2014 a use-after-free read that yields arbitrary kernel-memory disclosure and kernel address leaks.\\nI:H - The double `kfree()` corrupts the SLUB freelist, allowing the same chunk to be handed out twice and later overwritten, and the intervening `brelse()`/`put_bh()` decrements a refcount at an attacker-influenced address \\u2014 together a controlled write primitive leveragable for control-flow hijack and privilege escalation.\\nA:H - Even unexploited, a double-free plus dereference of freed `struct ext4_ext_path` entries reliably trips slab corruption detection or oopses in `brelse()` during mount, panicking the machine, and the mount can be repeated at will.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"8c26d9e53e5fbacda0732a577e97c5a5b7882aaf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"a34bed978364114390162c27e50fca50791c568d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"6367d3f04c69e2b8770b8137bd800e0784b0abbc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"1b558006d98b7b0b730027be0ee98973dd10ee0d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"3ff710662e8d86a63a39b334e9ca0cb10e5c14b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"63adc9016917e6970fb0104ee5fd6770f02b2d80\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2\", \"lessThan\": \"5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95\", \"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\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"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/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf\"}, {\"url\": \"https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d\"}, {\"url\": \"https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc\"}, {\"url\": \"https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d\"}, {\"url\": \"https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0\"}, {\"url\": \"https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80\"}, {\"url\": \"https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\\n\\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\\ntriggering a double-free in the following process:\\n\\next4_ext_replay_update_ex\\n  ppath = path\\n  ext4_force_split_extent_at(\u0026ppath)\\n    ext4_split_extent_at\\n      ext4_ext_insert_extent\\n        ext4_ext_create_new_leaf\\n          ext4_ext_grow_indepth\\n            ext4_find_extent\\n              if (depth \u003e path[0].p_maxdepth)\\n                kfree(path)                 ---\u003e path First freed\\n                *orig_path = path = NULL    ---\u003e null ppath\\n  kfree(path)                               ---\u003e path double-free !!!\\n\\nSo drop the unnecessary ppath and use path directly to avoid this problem.\\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\\nmemory allocation and freeing. Also, propagate the error returned by\\next4_find_extent() instead of using strange error codes.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:40:52.589Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49983\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:40:52.589Z\", \"dateReserved\": \"2024-10-21T12:17:06.053Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:02:28.474Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.