CVE-2021-47636 (GCVE-0-2021-47636)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2025-10-01 19:57
VLAI?
Title
ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock() Function ubifs_wbuf_write_nolock() may access buf out of bounds in following process: ubifs_wbuf_write_nolock(): aligned_len = ALIGN(len, 8); // Assume len = 4089, aligned_len = 4096 if (aligned_len <= wbuf->avail) ... // Not satisfy if (wbuf->used) { ubifs_leb_write() // Fill some data in avail wbuf len -= wbuf->avail; // len is still not 8-bytes aligned aligned_len -= wbuf->avail; } n = aligned_len >> c->max_write_shift; if (n) { n <<= c->max_write_shift; err = ubifs_leb_write(c, wbuf->lnum, buf + written, wbuf->offs, n); // n > len, read out of bounds less than 8(n-len) bytes } , which can be catched by KASAN: ========================================================= BUG: KASAN: slab-out-of-bounds in ecc_sw_hamming_calculate+0x1dc/0x7d0 Read of size 4 at addr ffff888105594ff8 by task kworker/u8:4/128 Workqueue: writeback wb_workfn (flush-ubifs_0_0) Call Trace: kasan_report.cold+0x81/0x165 nand_write_page_swecc+0xa9/0x160 ubifs_leb_write+0xf2/0x1b0 [ubifs] ubifs_wbuf_write_nolock+0x421/0x12c0 [ubifs] write_head+0xdc/0x1c0 [ubifs] ubifs_jnl_write_inode+0x627/0x960 [ubifs] wb_workfn+0x8af/0xb80 Function ubifs_wbuf_write_nolock() accepts that parameter 'len' is not 8 bytes aligned, the 'len' represents the true length of buf (which is allocated in 'ubifs_jnl_xxx', eg. ubifs_jnl_write_inode), so ubifs_wbuf_write_nolock() must handle the length read from 'buf' carefully to write leb safely. Fetch a reproducer in [Link].
Severity ?
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 5343575aa11c5d7044107d59d43f84aec01312b0 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < b80ccbec0e4804436c382d7dd60e943c386ed83a (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 07a209fadee7b53b46858538e1177597273862e4 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < a7054aaf1909cf40489c0ec1b728fdcf79c751a6 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < e09fa5318d51f522e1af4fbaf8f74999355980c8 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 3b7fb89135a20587d57f8877c02e25003e9edbdf (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 4f2262a334641e05f645364d5ade1f565c85f20b (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 4.19.238 , ≤ 4.19.* (semver)
Unaffected: 5.4.189 , ≤ 5.4.* (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.1, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47636\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:50:54.449259Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:01:21.393Z\"}}], \"cna\": {\"title\": \"ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"5343575aa11c5d7044107d59d43f84aec01312b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"b80ccbec0e4804436c382d7dd60e943c386ed83a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"07a209fadee7b53b46858538e1177597273862e4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"a7054aaf1909cf40489c0ec1b728fdcf79c751a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"e09fa5318d51f522e1af4fbaf8f74999355980c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"3b7fb89135a20587d57f8877c02e25003e9edbdf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d\", \"lessThan\": \"4f2262a334641e05f645364d5ade1f565c85f20b\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ubifs/io.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.27\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.27\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.238\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.189\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.110\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ubifs/io.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5343575aa11c5d7044107d59d43f84aec01312b0\"}, {\"url\": \"https://git.kernel.org/stable/c/b80ccbec0e4804436c382d7dd60e943c386ed83a\"}, {\"url\": \"https://git.kernel.org/stable/c/07a209fadee7b53b46858538e1177597273862e4\"}, {\"url\": \"https://git.kernel.org/stable/c/a7054aaf1909cf40489c0ec1b728fdcf79c751a6\"}, {\"url\": \"https://git.kernel.org/stable/c/e09fa5318d51f522e1af4fbaf8f74999355980c8\"}, {\"url\": \"https://git.kernel.org/stable/c/3b7fb89135a20587d57f8877c02e25003e9edbdf\"}, {\"url\": \"https://git.kernel.org/stable/c/4f2262a334641e05f645364d5ade1f565c85f20b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()\\n\\nFunction ubifs_wbuf_write_nolock() may access buf out of bounds in\\nfollowing process:\\n\\nubifs_wbuf_write_nolock():\\n  aligned_len = ALIGN(len, 8);   // Assume len = 4089, aligned_len = 4096\\n  if (aligned_len \u003c= wbuf-\u003eavail) ... // Not satisfy\\n  if (wbuf-\u003eused) {\\n    ubifs_leb_write()  // Fill some data in avail wbuf\\n    len -= wbuf-\u003eavail;   // len is still not 8-bytes aligned\\n    aligned_len -= wbuf-\u003eavail;\\n  }\\n  n = aligned_len \u003e\u003e c-\u003emax_write_shift;\\n  if (n) {\\n    n \u003c\u003c= c-\u003emax_write_shift;\\n    err = ubifs_leb_write(c, wbuf-\u003elnum, buf + written,\\n                          wbuf-\u003eoffs, n);\\n    // n \u003e len, read out of bounds less than 8(n-len) bytes\\n  }\\n\\n, which can be catched by KASAN:\\n  =========================================================\\n  BUG: KASAN: slab-out-of-bounds in ecc_sw_hamming_calculate+0x1dc/0x7d0\\n  Read of size 4 at addr ffff888105594ff8 by task kworker/u8:4/128\\n  Workqueue: writeback wb_workfn (flush-ubifs_0_0)\\n  Call Trace:\\n    kasan_report.cold+0x81/0x165\\n    nand_write_page_swecc+0xa9/0x160\\n    ubifs_leb_write+0xf2/0x1b0 [ubifs]\\n    ubifs_wbuf_write_nolock+0x421/0x12c0 [ubifs]\\n    write_head+0xdc/0x1c0 [ubifs]\\n    ubifs_jnl_write_inode+0x627/0x960 [ubifs]\\n    wb_workfn+0x8af/0xb80\\n\\nFunction ubifs_wbuf_write_nolock() accepts that parameter \u0027len\u0027 is not 8\\nbytes aligned, the \u0027len\u0027 represents the true length of buf (which is\\nallocated in \u0027ubifs_jnl_xxx\u0027, eg. ubifs_jnl_write_inode), so\\nubifs_wbuf_write_nolock() must handle the length read from \u0027buf\u0027 carefully\\nto write leb safely.\\n\\nFetch a reproducer in [Link].\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.238\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.189\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.110\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:15:15.334Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47636\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T19:57:08.785Z\", \"dateReserved\": \"2025-02-26T01:48:21.519Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:54:10.206Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.
  • 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.