{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89723",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89723"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation\n\nShuangpeng Bai reported that KASAN detected a slab-out-of-bounds error\nin nilfs_direct_propagate() during testing.\n\nAnalysis revealed that after truncating a file, a node block immediately\nbelow the B-tree root was not deleted.  Instead, it remained in the B-tree\nnode cache in a dirty state.  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 'deform' 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89723"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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's 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."
    }
  }
}