CVE-2026-63808 (GCVE-0-2026-63808)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
exfat: fix potential use-after-free in exfat_find_dir_entry()
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfat_find_dir_entry() In exfat_find_dir_entry(), the buffer_head obtained from exfat_get_dentry() is released with brelse(bh) before the fall-through TYPE_EXTEND branch reads the directory entry through ep (which points into bh->b_data): brelse(bh); if (entry_type == TYPE_EXTEND) { ... len = exfat_extract_uni_name(ep, entry_uniname); ... } After brelse() drops our reference, nothing guarantees that the underlying page backing bh->b_data remains valid for the subsequent exfat_extract_uni_name() read. This is the same pattern fixed in commit fc961522ddbd ("exfat: Fix potential use after free in exfat_load_upcase_table()"). Move brelse(bh) so it runs after ep is no longer dereferenced on each branch. Confirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y + CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image (long filename with same-hash collisions forcing the TYPE_EXTEND path). With a debug-only invalidate_bdev() inserted between brelse(bh) and the ep read to make the stale-deref window deterministic, the unpatched kernel faults: BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0 BUG: unable to handle page fault for address: ffff88801a5fa0c2 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0 With this patch applied, the same instrumented harness completes cleanly under the same sanitizer stack. I have not reproduced a crash on an uninstrumented kernel under ordinary reclaim; the instrumented A/B establishes the lifetime violation and that the patch closes it, not an unaided triggerability claim.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < e6f1a11cfb808441a43ffae9b476cc135732cd27 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < e48f413c2815787b8cade2795e194e3c4cd782ef (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 06c4e1e9967d332ac33ba38b7819851089ff9359 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 8e0abc17fbd7e305802e84fe98b4950d50f9c433 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 4d101016d5e587f820b3ae2d5bb6770d86342649 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < adfacfbaeae2cb760f492357cc36b41f84ef7f86 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 708b97e792945d3e4653939fd3405d71a61ad065 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 3f5f8ee9917cc2b9076ac533492d8a200edcabb8 (git)
Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (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\nexfat: fix potential use-after-free in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), the buffer_head obtained from\nexfat_get_dentry() is released with brelse(bh) before the fall-through\nTYPE_EXTEND branch reads the directory entry through ep (which points\ninto bh-\u003eb_data):\n\n\tbrelse(bh);\n\tif (entry_type == TYPE_EXTEND) {\n\t\t...\n\t\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\t\t...\n\t}\n\nAfter brelse() drops our reference, nothing guarantees that the\nunderlying page backing bh-\u003eb_data remains valid for the subsequent\nexfat_extract_uni_name() read. This is the same pattern fixed in\ncommit fc961522ddbd (\"exfat: Fix potential use after free in\nexfat_load_upcase_table()\").\n\nMove brelse(bh) so it runs after ep is no longer dereferenced on\neach branch.\n\nConfirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y\n+ CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image\n(long filename with same-hash collisions forcing the TYPE_EXTEND path).\nWith a debug-only invalidate_bdev() inserted between brelse(bh) and\nthe ep read to make the stale-deref window deterministic, the\nunpatched kernel faults:\n\n  BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0\n  BUG: unable to handle page fault for address: ffff88801a5fa0c2\n  Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n  RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0\n\nWith this patch applied, the same instrumented harness completes\ncleanly under the same sanitizer stack. I have not reproduced a\ncrash on an uninstrumented kernel under ordinary reclaim; the\ninstrumented A/B establishes the lifetime violation and that the\npatch closes it, not an unaided triggerability claim."
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      "title": "exfat: fix potential use-after-free in exfat_find_dir_entry()",
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This is the same pattern fixed in\\ncommit fc961522ddbd (\\\"exfat: Fix potential use after free in\\nexfat_load_upcase_table()\\\").\\n\\nMove brelse(bh) so it runs after ep is no longer dereferenced on\\neach branch.\\n\\nConfirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y\\n+ CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image\\n(long filename with same-hash collisions forcing the TYPE_EXTEND path).\\nWith a debug-only invalidate_bdev() inserted between brelse(bh) and\\nthe ep read to make the stale-deref window deterministic, the\\nunpatched kernel faults:\\n\\n  BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0\\n  BUG: unable to handle page fault for address: ffff88801a5fa0c2\\n  Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\\n  RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0\\n\\nWith this patch applied, the same instrumented harness completes\\ncleanly under the same sanitizer stack. I have not reproduced a\\ncrash on an uninstrumented kernel under ordinary reclaim; the\\ninstrumented A/B establishes the lifetime violation and that the\\npatch closes it, not an unaided triggerability claim.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/exfat/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"e6f1a11cfb808441a43ffae9b476cc135732cd27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"e48f413c2815787b8cade2795e194e3c4cd782ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"06c4e1e9967d332ac33ba38b7819851089ff9359\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"8e0abc17fbd7e305802e84fe98b4950d50f9c433\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"4d101016d5e587f820b3ae2d5bb6770d86342649\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"adfacfbaeae2cb760f492357cc36b41f84ef7f86\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"708b97e792945d3e4653939fd3405d71a61ad065\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca06197382bde0a3bc20215595d1c9ce20c6e341\",\"lessThan\":\"3f5f8ee9917cc2b9076ac533492d8a200edcabb8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/exfat/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06c4e1e9967d332ac33ba38b7819851089ff9359\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f5f8ee9917cc2b9076ac533492d8a200edcabb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4d101016d5e587f820b3ae2d5bb6770d86342649\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/708b97e792945d3e4653939fd3405d71a61ad065\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e0abc17fbd7e305802e84fe98b4950d50f9c433\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/adfacfbaeae2cb760f492357cc36b41f84ef7f86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e48f413c2815787b8cade2795e194e3c4cd782ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e6f1a11cfb808441a43ffae9b476cc135732cd27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T17:11:14+00:00",
      "cve": "CVE-2026-63808",
      "id": "CVE-2026-63808",
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      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: exfat: fix potential use-after-free in exfat_find_dir_entry()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63808.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.