MediumCVE-2026-46050

    Linux Kernel: Deadlock (CVE-2026-46050)

    Published Last modified Sources: Debian LTS, SUSE, Ubuntu, Siemens ProductCERT, BSI, CVE.org, Msrc Update Guide, EUVD

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix deadlock with check operation and nowait requests When an array check is running it will raise the barrier at which point normal requests will become blocked and increment the nr_pending value to signal there is work pending inside of wait_barrier(). NOWAIT requests do not block and so will return immediately with an error, and additionally do not increment nr_pending in wait_barrier().

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Conflicting version data — version display is hidden until the data is resolved.

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    5.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Debian LTS, SUSE, Ubuntu, Siemens ProductCERT, BSI, CVE.org, Msrc Update Guide, EUVD

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 0.6

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    45.48 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    5.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

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    0.1 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    0.6
    Low — this CVE sits in the lower 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix deadlock with check operation and nowait requests When an array check is running it will raise the barrier at which point normal requests will become blocked and increment the nr_pending value to signal there is work pending inside of wait_barrier(). NOWAIT requests do not block and so will return immediately with an error, and additionally do not increment nr_pending in wait_barrier(). Upstream change commit 43806c3d5b9b ("raid10: cleanup memleak at raid10_make_request") added a call to raid_end_bio_io() to fix a memory leak when NOWAIT requests hit this condition. raid_end_bio_io() eventually calls allow_barrier() and it will unconditionally do an atomic_dec_and_test(&conf->nr_pending) even though the corresponding increment on nr_pending didn't happen in the NOWAIT case. This can be easily seen by starting a check operation while an application is doing nowait IO on the same array. This results in a deadlocked state due to nr_pending value underflowing and so the md resync thread gets stuck waiting for nr_pending to == 0. Output of r10conf state of the array when we hit this condition: crash> struct r10conf barrier = 1, nr_pending = { counter = -41 }, nr_waiting = 15, nr_queued = 0, Example of md_sync thread stuck waiting on raise_barrier() and other requests stuck in wait_barrier(): md1_resync [<0>] raise_barrier+0xce/0x1c0 [<0>] raid10_sync_request+0x1ca/0x1ed0 [<0>] md_do_sync+0x779/0x1110 [<0>] md_thread+0x90/0x160 [<0>] kthread+0xbe/0xf0 [<0>] ret_from_fork+0x34/0x50 [<0>] ret_from_fork_asm+0x1a/0x30 kworker/u1040:2+flush-253:4 [<0>] wait_barrier+0x1de/0x220 [<0>] regular_request_wait+0x30/0x180 [<0>] raid10_make_request+0x261/0x1000 [<0>] md_handle_request+0x13b/0x230 [<0>] __submit_bio+0x107/0x1f0 [<0>] submit_bio_noacct_nocheck+0x16f/0x390 [<0>] ext4_io_submit+0x24/0x40 [<0>] ext4_do_writepages+0x254/0xc80 [<0>] ext4_writepages+0x84/0x120 [<0>] do_writepages+0x7a/0x260 [<0>] __writeback_single_inode+0x3d/0x300 [<0>] writeback_sb_inodes+0x1dd/0x470 [<0>] __writeback_inodes_wb+0x4c/0xe0 [<0>] wb_writeback+0x18b/0x2d0 [<0>] wb_workfn+0x2a1/0x400 [<0>] process_one_work+0x149/0x330 [<0>] worker_thread+0x2d2/0x410 [<0>] kthread+0xbe/0xf0 [<0>] ret_from_fork+0x34/0x50 [<0>] ret_from_fork_asm+0x1a/0x30

    Source: Debian LTS Advisories, suse_csaf, Ubuntu Security Notices, siemens_advisory, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), Microsoft Security Update Guide, ENISA EUVD, CVE.org (MITRE)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    LinuxLinux
    • 6.19 – < 7.0.4
    • 5.15.189 – < 5.15.209
    • 6.6.99 – < 6.6.140
    • 6.16 – < 6.18.27
    • 6.1.146 – < 6.1.175
    • 6.12.39 – < 6.12.86
    • —
    • 6.15.7 – < 6.16
    • 7.0.4
    • 5.15.209
    • 6.6.140
    • 6.18.27
    • 6.1.175
    • 6.12.86
    • 7.1
    • 6.16
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinux-6.1bullseye
    Linuxlinuxlinux_kernel6.16
    Linuxlinuxlinux_kernel—

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedLinux

      Show 21 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/1cdff2937c618f81058422bbdc4974a3e7ec9379
      Referenceadded
      —
      https://git.kernel.org/stable/c/2249983d971e6839b36284e6610390b2c217dfa1
      Referenceadded
      —
      https://git.kernel.org/stable/c/42fe37c90184cd1568838b84b488934c3671c963
      Referenceadded
      —
      https://git.kernel.org/stable/c/7d96f3120a7fb7210d21b520c5b6f495da6ba436
      Referenceadded
      —
      https://git.kernel.org/stable/c/965d6162dd88cc7cc193cf7f5bfc132d8bbf0523
      Referenceadded
      —
      https://git.kernel.org/stable/c/ae356d5eb1331d678985799f893e436314834a87
      Referenceadded
      —
      https://git.kernel.org/stable/c/cac2106bb9a2180b288079b49ed626414fb5bc45
      Referenceremoved
      https://git.kernel.org/stable/c/1cdff2937c618f81058422bbdc4974a3e7ec9379
      —
      Referenceremoved
      https://git.kernel.org/stable/c/2249983d971e6839b36284e6610390b2c217dfa1
      —
      Referenceremoved
      https://git.kernel.org/stable/c/42fe37c90184cd1568838b84b488934c3671c963
      —
      Referenceremoved
      https://git.kernel.org/stable/c/7d96f3120a7fb7210d21b520c5b6f495da6ba436
      —
      Referenceremoved
      https://git.kernel.org/stable/c/965d6162dd88cc7cc193cf7f5bfc132d8bbf0523
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ae356d5eb1331d678985799f893e436314834a87
      —
      Referenceremoved
      https://git.kernel.org/stable/c/cac2106bb9a2180b288079b49ed626414fb5bc45
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1cdff2937c618f81058422bbdc4974a3e7ec9379 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/2249983d971e6839b36284e6610390b2c217dfa1 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/42fe37c90184cd1568838b84b488934c3671c963 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/7d96f3120a7fb7210d21b520c5b6f495da6ba436 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/965d6162dd88cc7cc193cf7f5bfc132d8bbf0523 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ae356d5eb1331d678985799f893e436314834a87 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/cac2106bb9a2180b288079b49ed626414fb5bc45 Types: Patch
      —

      Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    2. Record modifiedSiemens ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/46xxx/CVE-2026-46050.json">CVE-2026-46050</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

      Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

    3. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (6.19 – before 7.0.4; 5.15.189 – before 5.15.209; 6.1.146 – before 6.1.175; 6.12.39 – before 6.12.86; 6.15.7 – before 6.16; 6.16.1 – before 6.18.27; 6.6.99 – before 6.6.140; 3 individual versions)

      CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-667

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-667
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15.189 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.146 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.39 up to (excluding) 6.12.86 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.15.7 up to (excluding) 6.16 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.16.1 up to (excluding) 6.18.27 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.99 up to (excluding) 6.6.140
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1cdff2937c618f81058422bbdc4974a3e7ec9379 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/2249983d971e6839b36284e6610390b2c217dfa1 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/42fe37c90184cd1568838b84b488934c3671c963 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/7d96f3120a7fb7210d21b520c5b6f495da6ba436 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/965d6162dd88cc7cc193cf7f5bfc132d8bbf0523 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/ae356d5eb1331d678985799f893e436314834a87 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/cac2106bb9a2180b288079b49ed626414fb5bc45 Types: Patch

      Source identifier: nvd@nist.gov

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