MediumCVE-2024-26901

    Linux Kernel: Information Disclosure (CVE-2024-26901)

    Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, Red Hat, CVE.org, EUVD, BSI

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak syzbot identified a kernel information leak vulnerability in do_sys_name_to_handle() and issued the following report [1]. [1] "BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x100 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] do_sys_name_to_handle fs/fhandle.c:73 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ... Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] do_sys_name_to_handle fs/fhandle.c:39 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ...

    Update Linux Kernel to version 4.19.311, Linux Kernel to version 5.4.273, Linux Kernel to version 5.10.214.

    Affected
    • Linux Kernel lt 2.6.39..4.19.311
    • Linux Kernel lt 4.20..5.4.273
    • Linux Kernel lt 5.5..5.10.214
    • Linux Kernel lt 5.11..5.15.153
    • Linux Kernel lt 5.16..6.1.83
    • Linux Kernel lt 6.2..6.6.23
    • Linux Kernel lt 6.7..6.7.11
    • Linux Kernel lt 6.8..6.8.2
    Fixed in
    • Linux Kernel 4.19.311
    • Linux Kernel 5.4.273
    • Linux Kernel 5.10.214
    • Linux Kernel 5.15.153
    • Linux Kernel 6.1.83
    • Linux Kernel 6.6.23
    • Linux Kernel 6.7.11
    • Linux Kernel 6.8.2
    • Linux Kernel 6.9

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

    Metrics

    5.5

    XIEM Effective CVSS

    Highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.3

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Siemens ProductCERT, SUSE, Debian, Red Hat, CVE.org, EUVD, BSI

    0.8 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 58.0

    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
    58.10 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
    5.3
    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“.

    Read in glossary
    0.8 %
    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
    58.0
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 16 July 2024

    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: do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak syzbot identified a kernel information leak vulnerability in do_sys_name_to_handle() and issued the following report [1]. [1] "BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x100 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] do_sys_name_to_handle fs/fhandle.c:73 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ... Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] do_sys_name_to_handle fs/fhandle.c:39 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ... Bytes 18-19 of 20 are uninitialized Memory access of size 20 starts at ffff888128a46380 Data copied to user address 0000000020000240" Per Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to solve the problem.

    Source: siemens_advisory, suse_csaf, Debian Security Advisories, redhat_csaf, NVD (NIST), cvelistv5, ENISA EUVD, BSI CSAF, BSI WID Portal

    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
    • 6.8 – < 6.8.2
    • 5.11 – < 5.15.153
    • 5.16 – < 6.1.83
    • —
    • 5.5 – < 5.10.214
    • 6.2 – < 6.6.23
    • 2.6.39 – < 4.19.311
    • 6.7 – < 6.7.11
    • 4.20 – < 5.4.273
    • 6.8.2
    • 5.15.153
    • 6.1.83
    • 6.9
    • 5.10.214
    • 6.6.23
    • 4.19.311
    • 6.7.11
    • 5.4.273

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbullseye
    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

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      Individual changes of this event as published by NVD
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43
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      https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71
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      https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1
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      https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b
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      https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b
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      https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b
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      https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730
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      https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126
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      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43
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      https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71
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      https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b
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      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43 Types: Patch
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      https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71 Types: Patch
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      https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1 Types: Patch
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      https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b Types: Patch
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      https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b Types: Patch
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      https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b Types: Patch
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      https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730 Types: Patch
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      https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126 Types: Patch
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      Reference typeremoved
      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6 Types: Patch
      —

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

    2. Record modifiedCVE Program

      Show 31 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43
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      https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71
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      https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1
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      https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b
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      https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b
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      https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b
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      https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730
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      https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126
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      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6
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      https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
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      https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43
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      https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730
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      https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126
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      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6
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      https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
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      https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
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      https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43 Types: Patch
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      https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71 Types: Patch
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      https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1 Types: Patch
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      https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b Types: Patch
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      https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b Types: Patch
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      https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b Types: Patch
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      Reference typeremoved
      https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730 Types: Patch
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      Reference typeremoved
      https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126 Types: Patch
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      Reference typeremoved
      https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6 Types: Patch
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/26xxx/CVE-2024-26901.json">CVE-2024-26901</a>
      Referenceadded
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      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      Referenceadded
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      https://cert-portal.siemens.com/productcert/html/ssa-398330.html
      Referenceremoved
      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      —
      Referenceremoved
      https://cert-portal.siemens.com/productcert/html/ssa-398330.html
      —

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

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