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CVE-2026-89704

Опубликовано: 14 сент. 2026
Источник: ubuntu
Приоритет: medium
EPSS Низкий
CVSS3: 7.5

Описание

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. S...

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needs-triage

noble

DNE

resolute

DNE

upstream

needs-triage

Показывать по

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DNE

jammy

DNE

noble

needs-triage

resolute

DNE

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DNE

esm-infra-legacy/xenial

ignored

superseded by linux-hwe
esm-infra/bionic

ignored

superseded by linux-hwe-5.4
jammy

DNE

noble

DNE

resolute

DNE

upstream

ignored

end of life

Показывать по

РелизСтатусПримечание
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needs-triage

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needs-triage

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needs-triage

jammy

DNE

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DNE

resolute

DNE

upstream

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DNE

esm-infra/bionic

needs-triage

jammy

DNE

noble

DNE

resolute

DNE

upstream

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Показывать по

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DNE

jammy

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noble

DNE

resolute

DNE

upstream

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devel

DNE

esm-infra/focal

ignored

end of kernel support
jammy

DNE

noble

DNE

resolute

DNE

upstream

ignored

end of life

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DNE

jammy

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superseded by Ubuntu Pro ppa version
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DNE

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DNE

upstream

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DNE

resolute

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DNE

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jammy

DNE

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resolute

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upstream

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Показывать по

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DNE

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needs-triage

jammy

DNE

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DNE

resolute

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DNE

esm-infra-legacy/xenial

needs-triage

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jammy

needs-triage

noble

DNE

resolute

DNE

upstream

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DNE

jammy

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jammy

DNE

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DNE

resolute

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DNE

jammy

ignored

superseded by linux-lowlatency-hwe-6.2
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DNE

resolute

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upstream

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superseded by linux-lowlatency-hwe-6.2

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DNE

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DNE

jammy

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superseded by linux-lowlatency-hwe-6.5
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DNE

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upstream

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superseded by linux-lowlatency-hwe-6.5

Показывать по

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DNE

jammy

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superseded by linux-lowlatency-hwe-6.8
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DNE

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upstream

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superseded by linux-lowlatency-hwe-6.8

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DNE

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end of kernel support
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end of kernel support

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superseded by linux-nvidia-6.5
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resolute

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DNE

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DNE

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Показывать по

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DNE

esm-infra/bionic

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Показывать по

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DNE

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jammy

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jammy

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esm-infra/bionic

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esm-infra/focal

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DNE

jammy

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Показывать по

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superseded by Ubuntu Pro ppa version
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superseded by Ubuntu Pro ppa version
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Показывать по

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Показывать по

EPSS

Процентиль: 37%
0.00444
Низкий

7.5 High

CVSS3

Связанные уязвимости

CVSS3: 6.8
redhat
4 дня назад

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. S...

CVSS3: 7.5
nvd
4 дня назад

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. S

CVSS3: 7.5
debian
4 дня назад

In the Linux kernel, the following vulnerability has been resolved: n ...

CVSS3: 7.5
github
4 дня назад

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....

EPSS

Процентиль: 37%
0.00444
Низкий

7.5 High

CVSS3

Уязвимость CVE-2026-89704