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CVE-2026-89704 (GCVE-0-2026-89704)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
nfsd: sample writeback error cursor before async COPY loop
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: sample writeback error cursor before async COPY loop _nfsd_copy_file_range() samples dst->f_wb_err into "since" after the copy loop, then uses it to detect writeback errors via filemap_check_wb_err() once vfs_fsync_range() returns. Because the nfsd_file cache reuses a single struct file across requests targeting the same inode, a concurrent COMMIT or stable WRITE on dst advances dst->f_wb_err to the current mapping->wb_err via file_check_and_advance_wb_err() during its own vfs_fsync_range(). If that advancement lands between the writeback error appearing in mapping->wb_err and the COPY worker sampling "since", the worker captures the already-advanced cursor, errseq_check() sees cur == since and returns zero, and NFSD4_COPY_F_COMMITTED is set even though writeback failed. CB_OFFLOAD then encodes wr_stable_how = FILE_SYNC4, the client treats the copied data as durable, and the failure becomes silent data loss. Sample since once at the start of the function. The cursor then reflects state in effect before this COPY issues any writes, and filemap_check_wb_err() detects any error that occurs during the copy regardless of which thread first observes it. This matches the pattern used by nfsd_vfs_write() and nfsd4_clone_file_range().
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f14816f2f928c560d28ba344af689f56efcd6f55 , < 435e4246c7dfff2fbd76dfdbf91975d5d9f788c9 (git)
Affected: 3145fe0ebb16e1715ad541a301bc6675c8375fcd , < 9f539a1c0791f907eb4e6d04b43178d9962e2def (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < 4728504c021656128a07f4693af80ed4a5fcc863 (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < 322422d66d1a04434a0dcc0c9d3a4c4b3f225117 (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < 52b2db7a72e19ac2686fa4b2a52406661e7bf9e2 (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < 8277d4a11ae2cb5495842be558fd946032c24363 (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < a1cbafe756cd5e6ab0e099062f37da7a5b081169 (git)
Affected: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb , < 20a67a7d18221af736f124770c2c5e859b479046 (git)
Affected: 5.10.124 , < 5.10.270 (semver)
Affected: 5.15.49 , < 5.15.221 (semver)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (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)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: sample writeback error cursor before async COPY loop\n\n_nfsd_copy_file_range() samples dst-\u003ef_wb_err into \"since\"\nafter the copy loop, then uses it to detect writeback errors\nvia filemap_check_wb_err() once vfs_fsync_range() returns.\nBecause the nfsd_file cache reuses a single struct file\nacross requests targeting the same inode, a concurrent\nCOMMIT or stable WRITE on dst advances dst-\u003ef_wb_err to the\ncurrent mapping-\u003ewb_err via file_check_and_advance_wb_err()\nduring its own vfs_fsync_range(). If that advancement lands\nbetween the writeback error appearing in mapping-\u003ewb_err\nand the COPY worker sampling \"since\", the worker captures\nthe already-advanced cursor, errseq_check() sees cur ==\nsince and returns zero, and NFSD4_COPY_F_COMMITTED is set\neven though writeback failed. CB_OFFLOAD then encodes\nwr_stable_how = FILE_SYNC4, the client treats the copied\ndata as durable, and the failure becomes silent data loss.\n\nSample since once at the start of the function. The cursor\nthen reflects state in effect before this COPY issues any\nwrites, and filemap_check_wb_err() detects any error that\noccurs during the copy regardless of which thread first\nobserves it. This matches the pattern used by\nnfsd_vfs_write() and nfsd4_clone_file_range()."
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              "value": "AV:N - NFSv4.2 COPY is handled by in-kernel nfsd over TCP/UDP 2049; a remote client reaches _nfsd_copy_file_range() via COMPOUND SEQUENCE/PUTFH/OPEN/COPY with no local access on the server.\nAC:L - The attacker issues async COPY and a concurrent COMMIT or stable WRITE on the same destination inode, which share one nfsd_file/struct file, and can force writeback errors via ENOSPC or quota and retry; both sides of the race are attacker-controlled.\nPR:N - Typical nfsd exports use AUTH_SYS or AUTH_NULL with IP-based ACLs, so a network peer can spoof a UID, create an NFSv4.2 session, OPEN source and dest files, and issue COPY without a local account or capability on the NFS server.\nUI:N - The attacker sends the COPY and COMMIT RPCs themselves against an already-exported writable filesystem; no administrator or victim user action is required at exploit time.\nS:U - The missed writeback error only affects durability reporting and file data on the host running nfsd and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - This is a silent durability-reporting failure, not memory disclosure; there is no out-of-bounds read, use-after-free, or kernel pointer leak.\nI:H - When a concurrent COMMIT advances dst-\u003ef_wb_err before COPY samples it, CB_OFFLOAD encodes wr_stable_how=FILE_SYNC4 despite failed writeback, so clients treat the copied range as durable and the data is silently lost after crash or cache eviction.\nA:N - The flaw does not oops, panic, deadlock, or hang nfsd; the server keeps running, and lost durability is an integrity failure rather than a kernel or NFS-service crash."
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If that advancement lands\\nbetween the writeback error appearing in mapping-\u003ewb_err\\nand the COPY worker sampling \\\"since\\\", the worker captures\\nthe already-advanced cursor, errseq_check() sees cur ==\\nsince and returns zero, and NFSD4_COPY_F_COMMITTED is set\\neven though writeback failed. CB_OFFLOAD then encodes\\nwr_stable_how = FILE_SYNC4, the client treats the copied\\ndata as durable, and the failure becomes silent data loss.\\n\\nSample since once at the start of the function. The cursor\\nthen reflects state in effect before this COPY issues any\\nwrites, and filemap_check_wb_err() detects any error that\\noccurs during the copy regardless of which thread first\\nobserves it. This matches the pattern used by\\nnfsd_vfs_write() and nfsd4_clone_file_range().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f14816f2f928c560d28ba344af689f56efcd6f55\",\"lessThan\":\"435e4246c7dfff2fbd76dfdbf91975d5d9f788c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3145fe0ebb16e1715ad541a301bc6675c8375fcd\",\"lessThan\":\"9f539a1c0791f907eb4e6d04b43178d9962e2def\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"4728504c021656128a07f4693af80ed4a5fcc863\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"322422d66d1a04434a0dcc0c9d3a4c4b3f225117\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"52b2db7a72e19ac2686fa4b2a52406661e7bf9e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"8277d4a11ae2cb5495842be558fd946032c24363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"a1cbafe756cd5e6ab0e099062f37da7a5b081169\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb\",\"lessThan\":\"20a67a7d18221af736f124770c2c5e859b479046\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.124\",\"lessThan\":\"5.10.270\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.49\",\"lessThan\":\"5.15.221\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"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:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/20a67a7d18221af736f124770c2c5e859b479046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/322422d66d1a04434a0dcc0c9d3a4c4b3f225117\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/435e4246c7dfff2fbd76dfdbf91975d5d9f788c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4728504c021656128a07f4693af80ed4a5fcc863\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/52b2db7a72e19ac2686fa4b2a52406661e7bf9e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8277d4a11ae2cb5495842be558fd946032c24363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f539a1c0791f907eb4e6d04b43178d9962e2def\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1cbafe756cd5e6ab0e099062f37da7a5b081169\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
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      "current_release_date": "2026-09-13T06:52:23+00:00",
      "cve": "CVE-2026-89704",
      "id": "CVE-2026-89704",
      "initial_release_date": "2026-09-11T19:46:21.039000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: nfsd silent data loss due to incorrect writeback error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89704.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T23:59:48Z",
      "cve": "CVE-2026-89704",
      "id": "CVE-2026-89704",
      "initial_release_date": "2026-09-12T16:23:18Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89704",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89704.json",
      "version": "4"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.