CVE-2024-49883 (GCVE-0-2024-49883)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2025-11-03 22:22
VLAI?
Title
ext4: aovid use-after-free in ext4_ext_insert_extent()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: aovid use-after-free in ext4_ext_insert_extent() As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values: ext4_ext_insert_extent path = *ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = *ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); *ppath = path = NULL; path = kcalloc() = 3000 *ppath = 3000; return path; /* here path is still 2000, UAF! */ eh = path[depth].p_hdr ================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...] Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ================================================================== So use *ppath to update the path to avoid the above problem.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 10809df84a4d868db61af621bae3658494165279 , < e17ebe4fdd7665c93ae9459ba40fcdfb76769ac1 (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < 975ca06f3fd154c5f7742083e7b2574c57d1c0c3 (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < 5e811066c5ab709b070659197dccfb80ab650ddd (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < 9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < 51db04892a993cace63415be99848970a0f15ef2 (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < 8162ee5d94b8c0351be0a9321be134872a7654a1 (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < beb7b66fb489041c50c6473100b383f7a51648fc (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b (git)
Affected: 10809df84a4d868db61af621bae3658494165279 , < a164f3a432aae62ca23d03e6d926b122ee5b860d (git)
Create a notification for this product.
    Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (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)
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\"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/e17ebe4fdd7665c93ae9459ba40fcdfb76769ac1\"}, {\"url\": \"https://git.kernel.org/stable/c/975ca06f3fd154c5f7742083e7b2574c57d1c0c3\"}, {\"url\": \"https://git.kernel.org/stable/c/5e811066c5ab709b070659197dccfb80ab650ddd\"}, {\"url\": \"https://git.kernel.org/stable/c/9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a\"}, {\"url\": \"https://git.kernel.org/stable/c/51db04892a993cace63415be99848970a0f15ef2\"}, {\"url\": \"https://git.kernel.org/stable/c/8162ee5d94b8c0351be0a9321be134872a7654a1\"}, {\"url\": \"https://git.kernel.org/stable/c/beb7b66fb489041c50c6473100b383f7a51648fc\"}, {\"url\": \"https://git.kernel.org/stable/c/bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b\"}, {\"url\": \"https://git.kernel.org/stable/c/a164f3a432aae62ca23d03e6d926b122ee5b860d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: aovid use-after-free in ext4_ext_insert_extent()\\n\\nAs Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is\\nreallocated in ext4_ext_create_new_leaf(), we\u0027ll use the stale path and\\ncause UAF. Below is a sample trace with dummy values:\\n\\next4_ext_insert_extent\\n  path = *ppath = 2000\\n  ext4_ext_create_new_leaf(ppath)\\n    ext4_find_extent(ppath)\\n      path = *ppath = 2000\\n      if (depth \u003e path[0].p_maxdepth)\\n            kfree(path = 2000);\\n            *ppath = path = NULL;\\n      path = kcalloc() = 3000\\n      *ppath = 3000;\\n      return path;\\n  /* here path is still 2000, UAF! */\\n  eh = path[depth].p_hdr\\n\\n==================================================================\\nBUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330\\nRead of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179\\nCPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866\\nCall Trace:\\n \u003cTASK\u003e\\n ext4_ext_insert_extent+0x26d4/0x3330\\n ext4_ext_map_blocks+0xe22/0x2d40\\n ext4_map_blocks+0x71e/0x1700\\n ext4_do_writepages+0x1290/0x2800\\n[...]\\n\\nAllocated by task 179:\\n ext4_find_extent+0x81c/0x1f70\\n ext4_ext_map_blocks+0x146/0x2d40\\n ext4_map_blocks+0x71e/0x1700\\n ext4_do_writepages+0x1290/0x2800\\n ext4_writepages+0x26d/0x4e0\\n do_writepages+0x175/0x700\\n[...]\\n\\nFreed by task 179:\\n kfree+0xcb/0x240\\n ext4_find_extent+0x7c0/0x1f70\\n ext4_ext_insert_extent+0xa26/0x3330\\n ext4_ext_map_blocks+0xe22/0x2d40\\n ext4_map_blocks+0x71e/0x1700\\n ext4_do_writepages+0x1290/0x2800\\n ext4_writepages+0x26d/0x4e0\\n do_writepages+0x175/0x700\\n[...]\\n==================================================================\\n\\nSo use *ppath to update the path to avoid the above problem.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:40:24.275Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49883\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:22:49.557Z\", \"dateReserved\": \"2024-10-21T12:17:06.021Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:20.827Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • 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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • 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.