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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2026-05-28T10:16:00Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix missing last_unlink_trans update when removing a directory\n\nWhen removing a directory we are not updating its last_unlink_trans field,\nwhich can result in incorrect fsync behaviour in case some one fsyncs the\ndirectory after it was removed because it's holding a file descriptor on\nit.\n\nExample scenario:\n\n   mkdir /mnt/dir1\n   mkdir /mnt/dir1/dir2\n   mkdir /mnt/dir3\n\n   sync -f /mnt\n\n   # Do some change to the directory and fsync it.\n   chmod 700 /mnt/dir1\n   xfs_io -c fsync /mnt/dir1\n\n   # Move dir2 out of dir1 so that dir1 becomes empty.\n   mv /mnt/dir1/dir2 /mnt/dir3/\n\n   open fd on /mnt/dir1\n   call rmdir(2) on path \"/mnt/dir1\"\n   fsync fd\n\n   <trigger power failure>\n\nWhen attempting to mount the filesystem, the log replay will fail with\nan -EIO error and dmesg/syslog has the following:\n\n   [445771.626482] BTRFS info (device dm-0): first mount of filesystem 0368bbea-6c5e-44b5-b409-09abe496e650\n   [445771.626486] BTRFS info (device dm-0): using crc32c checksum algorithm\n   [445771.627912] BTRFS info (device dm-0): start tree-log replay\n   [445771.628335] page: refcount:2 mapcount:0 mapping:0000000061443ddc index:0x1d00 pfn:0x7072a5\n   [445771.629453] memcg:ffff89f400351b00\n   [445771.629892] aops:btree_aops [btrfs] ino:1\n   [445771.630737] flags: 0x17fffc00000402a(uptodate|lru|private|writeback|node=0|zone=2|lastcpupid=0x1ffff)\n   [445771.632359] raw: 017fffc00000402a fffff47284d950c8 fffff472907b7c08 ffff89f458e412b8\n   [445771.633713] raw: 0000000000001d00 ffff89f6c51d1a90 00000002ffffffff ffff89f400351b00\n   [445771.635029] page dumped because: eb page dump\n   [445771.635825] BTRFS critical (device dm-0): corrupt leaf: root=5 block=30408704 slot=10 ino=258, invalid nlink: has 2 expect no more than 1 for dir\n   [445771.638088] BTRFS info (device dm-0): leaf 30408704 gen 10 total ptrs 17 free space 14878 owner 5\n   [445771.638091] BTRFS info (device dm-0): refs 4 lock_owner 0 current 3581087\n   [445771.638094] \titem 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160\n   [445771.638097] \t\tinode generation 3 transid 9 size 16 nbytes 16384\n   [445771.638098] \t\tblock group 0 mode 40755 links 1 uid 0 gid 0\n   [445771.638100] \t\trdev 0 sequence 2 flags 0x0\n   [445771.638102] \t\tatime 1775744884.0\n   [445771.660056] \t\tctime 1775744885.645502983\n   [445771.660058] \t\tmtime 1775744885.645502983\n   [445771.660060] \t\totime 1775744884.0\n   [445771.660062] \titem 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12\n   [445771.660064] \t\tindex 0 name_len 2\n   [445771.660066] \titem 2 key (256 DIR_ITEM 1843588421) itemoff 16077 itemsize 34\n   [445771.660068] \t\tlocation key (259 1 0) type 2\n   [445771.660070] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660075] \titem 3 key (256 DIR_ITEM 2363071922) itemoff 16043 itemsize 34\n   [445771.660076] \t\tlocation key (257 1 0) type 2\n   [445771.660077] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660078] \titem 4 key (256 DIR_INDEX 2) itemoff 16009 itemsize 34\n   [445771.660079] \t\tlocation key (257 1 0) type 2\n   [445771.660080] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660081] \titem 5 key (256 DIR_INDEX 3) itemoff 15975 itemsize 34\n   [445771.660082] \t\tlocation key (259 1 0) type 2\n   [445771.660083] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660084] \titem 6 key (257 INODE_ITEM 0) itemoff 15815 itemsize 160\n   [445771.660086] \t\tinode generation 9 transid 9 size 8 nbytes 0\n   [445771.660087] \t\tblock group 0 mode 40777 links 1 uid 0 gid 0\n   [445771.660088] \t\trdev 0 sequence 2 flags 0x0\n   [445771.660089] \t\tatime 1775744885.641174097\n   [445771.660090] \t\tctime 1775744885.645502983\n   [445771.660091] \t\tmtime 1775744885.645502983\n   [445771.660105] \t\totime 1775744885.641174097\n   [445771.660106] \titem 7 key (257 INODE_REF 256) itemoff 15801 itemsize 14\n   [445771.660107] \t\tindex 2 name_len 4\n   [445771.660108] \titem 8 key (257 DIR_ITEM 2676584006) itemoff 15767 itemsize 34\n   [445771.660109] \t\tlocation key (2\n---truncated---",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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          "Debian-10:linux-source-4.19-0:4.19.325-1.all",
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          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-46160"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/2525998ac956476bded26b9f34c4164dc890b87a",
          "url": "https://git.kernel.org/stable/c/2525998ac956476bded26b9f34c4164dc890b87a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/36fcc2c7517f8a86379154c9793f867592aa8b7e",
          "url": "https://git.kernel.org/stable/c/36fcc2c7517f8a86379154c9793f867592aa8b7e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6acbb2f6dff23c9bb9761fb98b516525b9cf1ce9",
          "url": "https://git.kernel.org/stable/c/6acbb2f6dff23c9bb9761fb98b516525b9cf1ce9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/999757231c49376cd1a37308d2c8c4c9932571e1",
          "url": "https://git.kernel.org/stable/c/999757231c49376cd1a37308d2c8c4c9932571e1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/aa9c3ecaf7337df3a689318584f879b5339ede0f",
          "url": "https://git.kernel.org/stable/c/aa9c3ecaf7337df3a689318584f879b5339ede0f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/af467162290f5fe79d6a361b7c84302e45b1fd9f",
          "url": "https://git.kernel.org/stable/c/af467162290f5fe79d6a361b7c84302e45b1fd9f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/cc3c0a0f965754ce230d93ba44ee5b34fbe6138a",
          "url": "https://git.kernel.org/stable/c/cc3c0a0f965754ce230d93ba44ee5b34fbe6138a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/fb388eb58c1ba047ccabc33901839acfecadcf49",
          "url": "https://git.kernel.org/stable/c/fb388eb58c1ba047ccabc33901839acfecadcf49"
        }
      ],
      "release_date": "2026-05-28T10:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:28:42.740320Z",
          "details": "This issue is confined to Btrfs and requires a contrived local sequence—holding a directory open, removing it, fsyncing that still-open directory, and then immediately inducing a crash/power loss—so it cannot be triggered remotely and demands local write privileges plus the ability to crash the system. Its effect is availability-only (log replay/mount failure) with no confidentiality, integrity, code-execution, or privilege‑escalation impact. Deployments not using Btrfs are unaffected, and in centrally managed VM/server environments where low‑privilege users cannot cause power loss, practical exploitation is unlikely, so this can be safely deprioritized.",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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    }
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}