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CVE-2026-89723 (GCVE-0-2026-89723)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 39005fd1ce654ffdecacddc406b9a038efe606e6 (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < bf49e6f6ddc12445a0330708b365de6458085980 (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 5d3783c451a546373662ee11ec17019273e68034 (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 448636c745a3f3b8582a0b8ce718c890a11c0fa9 (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 28362e8ce51377afdec1782e661e808328a10514 (git)
Affected: 36a580eb489f54d81a0534974962e732a314b999 , < 45662dedb8f272ef7f16e69f13424c4bd0399240 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "lang": "en",
              "value": "AV:L - The defect is reached only through local VFS operations on a mounted nilfs2 volume (write to grow a file into B-tree mapping, ftruncate/setattr to collapse it to direct mapping, then the in-kernel log writer). No network protocol path enters fs/nilfs2/direct.c.\nAC:L - The leftover dirty B-tree node after truncation is a deterministic logic bug, not a race. The attacker controls file layout and size, and can force the segment constructor to process the orphaned node via fsync/sync or the periodic log writer.\nPR:L - Write and truncate go through nilfs_setattr/nilfs_truncate with only ordinary file DAC checks; CAP_SYS_ADMIN in fs/nilfs2/ioctl.c is not on this path. An unprivileged user with write access to an already-mounted nilfs2 volume can trigger it.\nUI:N - On an already-mounted nilfs2 volume the attacker triggers the B-tree-to-direct conversion and the subsequent slab OOB entirely with their own write/ftruncate/fsync; no separate victim action is required.\nS:U - The slab out-of-bounds access corrupts kernel memory within the same kernel security authority; this is local memory corruption/privilege escalation, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - nilfs_direct_propagate indexes the 6-entry direct-pointer array with the leftover B-tree node\u0027s virtual block number via nilfs_direct_get_ptr, an unbounded slab out-of-bounds read of adjacent nilfs_inode_info/slab memory that can disclose kernel data.\nI:H - For a non-volatile leftover node, nilfs_direct_set_ptr writes a newly allocated DAT vblock at the same unbounded OOB index, and the OOB-read pointer is passed to nilfs_dat_prepare_update, yielding a kernel write primitive and DAT metadata corruption.\nA:H - The unbounded slab-out-of-bounds access was caught by KASAN and produces a kernel oops/panic when the out-of-range index lands outside mapped slab objects, taking the system down."
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    "datePublished": "2026-09-11T19:46:35.161Z",
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      "product_status:under_investigation": "1",
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      "title": "nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation",
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The log writer subsequently detected this\\nblock and incorrectly invoked nilfs_direct_propagate() on it, which is\\ndesigned to handle only data blocks in direct mapping.\\n\\nB-tree nodes in the cache are managed by virtual block numbers, and their\\nlogical keys typically exceed the range expected by direct mapping.\\nConsequently, processing such a node as a direct mapping entry triggers\\na slab-out-of-bounds access.\\n\\nThe root cause is that when a B-tree mapping collapses into a direct\\nmapping during truncation, an intermediate node block pointed to by the\\nroot node is left behind as garbage instead of being explicitly deleted.\\n\\nThis resolves the issue by adding a nilfs_btree_discard() operation\\nto delete the remaining intermediate node block during the conversion.\\nA \u0027deform\u0027 flag is added to the bop_delete interface to explicitly signal\\nthat the deletion is part of a mapping transformation.  This allows the\\nB-tree mapping implementation to perform the necessary cleanup and\\ndiscarding of the residual node structure that would be otherwise be left\\norphaned after the transition.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nilfs2/bmap.c\",\"fs/nilfs2/bmap.h\",\"fs/nilfs2/btree.c\",\"fs/nilfs2/direct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"39005fd1ce654ffdecacddc406b9a038efe606e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"bf49e6f6ddc12445a0330708b365de6458085980\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"5d3783c451a546373662ee11ec17019273e68034\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"448636c745a3f3b8582a0b8ce718c890a11c0fa9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"28362e8ce51377afdec1782e661e808328a10514\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"36a580eb489f54d81a0534974962e732a314b999\",\"lessThan\":\"45662dedb8f272ef7f16e69f13424c4bd0399240\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nilfs2/bmap.c\",\"fs/nilfs2/bmap.h\",\"fs/nilfs2/btree.c\",\"fs/nilfs2/direct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-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: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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T07:01:10+00:00",
      "cve": "CVE-2026-89723",
      "id": "CVE-2026-89723",
      "initial_release_date": "2026-09-11T19:46:35.161000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nilfs2: Linux kernel: nilfs2 slab-out-of-bounds due to improper node block handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89723.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T16:56:41Z",
      "cve": "CVE-2026-89723",
      "id": "CVE-2026-89723",
      "initial_release_date": "2026-09-12T16:22:48Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89723",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89723.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.