In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:21745 advisory.

    * kernel: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981)
      * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
      * kernel: ALSA: firewire-motu: fix buffer overflow in hwdep read for DSP events (CVE-2025-68347)
      * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)
      * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)
      * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or     privilege escalation (CVE-2026-23270)
      * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)
      * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold     (CVE-2026-31408)
      * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)
      * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
      * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)
      * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
      * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)
      * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)
      * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)
      * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)
      * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
      * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:21706 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981)

    * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)

    * kernel: ALSA: firewire-motu: fix buffer overflow in hwdep read for DSP events (CVE-2025-68347)

    * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)

    * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)

    * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or     privilege escalation (CVE-2026-23270)

    * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)

    * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)

    * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)

    * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)

    * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)

    * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)

    * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)

    * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)

    * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)

    * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)

    * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

    * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:21745 advisory.

    The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with     extremely high determinism requirements.

    Security Fix(es):

    * kernel: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981)

    * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)

    * kernel: ALSA: firewire-motu: fix buffer overflow in hwdep read for DSP events (CVE-2025-68347)

    * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)

    * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)

    * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or     privilege escalation (CVE-2026-23270)

    * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)

    * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)

    * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)

    * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)

    * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)

    * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)

    * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)

    * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)

    * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)

    * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)

    * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

    * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:21556 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al     (CVE-2025-38653)

    * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)

    * kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)

    * kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724)

    * kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089)

    * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)

    * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)

    * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)

    * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)

    * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)

    * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)

    * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)

    * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)

    * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)

    * kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)

    * kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)

    * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

    * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

    * kernel: mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:21706 advisory.

    * kernel: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981)
      * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
      * kernel: ALSA: firewire-motu: fix buffer overflow in hwdep read for DSP events (CVE-2025-68347)
      * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)
      * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)
      * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or     privilege escalation (CVE-2026-23270)
      * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)
      * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold     (CVE-2026-31408)
      * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)
      * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
      * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)
      * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
      * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)
      * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)
      * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)
      * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)
      * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
      * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6253 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6253-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     May 08, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : linux     CVE ID         : CVE-2025-38584 CVE-2026-23468 CVE-2026-31419 CVE-2026-31709                      CVE-2026-31715 CVE-2026-43284 CVE-2026-43500

    Several vulnerabilities have been discovered in the Linux kernel that     may lead to a privilege escalation, denial of service or information     leaks.

    For the stable distribution (trixie), these problems have been fixed in     version 6.12.86-1.

    We recommend that you upgrade your linux packages.

    For the detailed security status of linux please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/linux

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and     id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming     ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl     header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field     OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation     of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header,     claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the     validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks     into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared     validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side     parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.
    (CVE-2026-31709)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
317530	AlmaLinux 8 : kernel-rt (ALSA-2026:21745)	Nessus	Alma Linux Local Security Checks	high
317512	RHEL 8 : kernel (RHSA-2026:21706)	Nessus	Red Hat Local Security Checks	high
317504	RHEL 8 : kernel-rt (RHSA-2026:21745)	Nessus	Red Hat Local Security Checks	high
317462	RHEL 9 : kernel (RHSA-2026:21556)	Nessus	Red Hat Local Security Checks	high
317455	AlmaLinux 8 : kernel (ALSA-2026:21706)	Nessus	Alma Linux Local Security Checks	high
313288	Debian dsa-6253 : ata-modules-6.12.74+deb13+1-armmp-di - security update	Nessus	Debian Local Security Checks	high
311685	Linux Distros Unpatched Vulnerability : CVE-2026-31709	Nessus	Misc.	high

Detections

Analytics

CVE-2026-31709

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Tenable Plugins

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high