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CVE-2026-104036

Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin

5.8 MediumFix available

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
High

Exploit likelihood

0.09%Unchanged since Oct 6, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.8

Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
CVE-2026-104036
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Weakness
CWE-787
Updated
2026-11-05
EUVDEUVD-2026-92893 5.8

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
EUVD-2026-92893
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-05
GitHub AdvisoriesGHSA-95ww-m774-j7x2 5.8

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the...

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
GHSA-95ww-m774-j7x2
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Weakness
CWE-787
Updated
2026-11-02
NVD 5.8

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
CVE-2026-104036
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Weakness
CWE-787
Updated
2026-11-05
OSVDEBIAN-CVE-2026-104036 5.8

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
DEBIAN-CVE-2026-104036
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-07
OSVOESA-2026-4425 5.8

sssd security update

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.(CVE-2026-104036)

Record
OESA-2026-4425
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-02
Show 5 moreShow less
OSVOESA-2026-4592 5.9

sssd security update

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.(CVE-2026-104036)

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.(CVE-2026-104038)

Record
OESA-2026-4592
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-4593 5.9

sssd security update

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.(CVE-2026-104036)

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.(CVE-2026-104038)

Record
OESA-2026-4593
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-4594 5.9

sssd security update

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.(CVE-2026-104036)

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.(CVE-2026-104038)

Record
OESA-2026-4594
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-104036 5.8

A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.

Record
UBUNTU-CVE-2026-104036
CVSS 3.1
5.8 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-02
OSVSUSE-SU-2026:5079-1 No score

Security update for sssd

This update for sssd fixes the following issues:

  • CVE-2026-12610: cancelled or completed PAM request while the asynchronous child process is still running can lead to a use-after-free (bsc#1269807).
  • CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-bounds read (bsc#1273922).
  • CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds reads (bsc#1273925).
  • CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory disclosure (bsc#1273924).
  • CVE-2026-90462: Fail-open in LDAP ppolicy access check allows continued authorization (bsc#1282584).
  • CVE-2026-90463: out-of-bounds read in the NSS service request parsers (bsc#1280360).
  • CVE-2026-90994: out-of-bounds read in PAM v1 parser (bsc#1280361).
  • CVE-2026-90995: NULL pointer dereference in PAM responder (bsc#1280362).
  • CVE-2026-90996: zero-length request body underflow in the NSS responder (bsc#1280363).
  • CVE-2026-92821: access control bypass due to premature LDAP access rule evaluation (bsc#1284326).
  • CVE-2026-104029: denial of service due to out-of-bounds read in autofs responder (bsc#1284314).
  • CVE-2026-104031: denial of service via memory exhaustion in autofs responder (bsc#1284316).
  • CVE-2026-104033: access control bypass due to improper LDAP shadow expiration check (bsc#1284318).
  • CVE-2026-104036: denial of service due to out-of-bounds write in NFS idmap plugin (bsc#1284321).
  • CVE-2026-104037: denial of service due to packet length underflow in autofs responder (bsc#1284322).
  • CVE-2026-104038: denial of service via missing SID extension in certificate mapping (bsc#1284323).
  • CVE-2026-104039: denial of service due to stale connection state reuse in PAM GSSAPI responder (bsc#1284324).
  • CVE-2026-104043: Denial of Service via undersized packet parsing in NSS responder (bsc#1284266).
  • CVE-2026-104045: denial of service via race condition in autofs responder (bsc#1284470).
Record
SUSE-SU-2026:5079-1
Updated
2026-11-03

Affected products

Affected packages

Affected packages
PackageAffectedFixed
sssd
Debian:12
 All versions, plus listed versions
2.10.1-12.10.1-22.11.1-12.11.1-22.11.1-2.1
Show 22 moreShow less
2.12.0-12.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-42.8.2-42.8.2-4+deb12u12.9.1-12.9.1-22.9.2-12.9.4-12.9.4-1.12.9.4-1.1~exp12.9.4-22.9.5-12.9.5-22.9.5-32.9.5-42.9.5-5
 None known
sssd
Debian:13
 All versions, plus listed versions
2.10.1-22.11.1-12.11.1-22.11.1-2.12.12.0-1
Show 7 moreShow less
2.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-4
 None known
sssd
Debian:14
 All versions, plus listed versions
2.10.1-22.11.1-12.11.1-22.11.1-2.12.12.0-1
Show 7 moreShow less
2.12.0-22.12.0-3~exp02.12.0-42.13.1-12.13.1-22.13.1-32.13.1-4
 None known
sssd
openEuler:22.03-LTS-SP4
 before 2.6.1-34.oe2203sp4
2.6.1-34.oe2203sp4
sssd
openEuler:24.03-LTS-SP1
From an advisory covering 2 CVEs
 before 2.9.4-30.oe2403sp1
2.9.4-30.oe2403sp1
sssd
openEuler:24.03-LTS-SP3
From an advisory covering 2 CVEs
 before 2.9.4-30.oe2403sp3
2.9.4-30.oe2403sp3
sssd
openEuler:24.03-LTS-SP4
From an advisory covering 2 CVEs
 before 2.9.4-30.oe2403sp4
2.9.4-30.oe2403sp4
sssd
SUSE:Linux Enterprise Server 15 SP6-LTSS
From an advisory covering 19 CVEs
 before 2.10.2-150600.3.58.1
2.10.2-150600.3.58.1
sssd
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
From an advisory covering 19 CVEs
 before 2.10.2-150600.3.58.1
2.10.2-150600.3.58.1
sssd
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.12.5-21.13.1-21.13.2-11.13.3-11.13.4-1
Show 15 moreShow less
1.13.4-1ubuntu11.13.4-1ubuntu1.11.13.4-1ubuntu1.21.13.4-1ubuntu1.51.13.4-1ubuntu1.61.13.4-1ubuntu1.71.13.4-1ubuntu1.81.13.4-1ubuntu1.91.13.4-1ubuntu1.101.13.4-1ubuntu1.111.13.4-1ubuntu1.121.13.4-1ubuntu1.131.13.4-1ubuntu1.141.13.4-1ubuntu1.151.13.4-1ubuntu1.15+esm1
 None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
sssd
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.15.3-2ubuntu11.15.3-3ubuntu11.16.0-5ubuntu11.16.0-5ubuntu21.16.1-1ubuntu1
Show 9 moreShow less
1.16.1-1ubuntu1.11.16.1-1ubuntu1.21.16.1-1ubuntu1.31.16.1-1ubuntu1.41.16.1-1ubuntu1.51.16.1-1ubuntu1.61.16.1-1ubuntu1.71.16.1-1ubuntu1.81.16.1-1ubuntu1.8+esm1
 None known
sssd
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.2.0-4ubuntu12.2.2-12.2.2-1ubuntu12.2.3-1.1ubuntu12.2.3-2
Show 14 moreShow less
2.2.3-32.2.3-3ubuntu0.12.2.3-3ubuntu0.22.2.3-3ubuntu0.32.2.3-3ubuntu0.42.2.3-3ubuntu0.62.2.3-3ubuntu0.72.2.3-3ubuntu0.82.2.3-3ubuntu0.92.2.3-3ubuntu0.102.2.3-3ubuntu0.112.2.3-3ubuntu0.122.2.3-3ubuntu0.132.2.3-3ubuntu0.13+esm1
 None known
sssd
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.4.1-2ubuntu42.5.2-4ubuntu12.5.2-4ubuntu32.5.2-4ubuntu42.6.1-1ubuntu3
Show 9 moreShow less
2.6.3-1ubuntu32.6.3-1ubuntu3.12.6.3-1ubuntu3.22.6.3-1ubuntu3.32.6.3-1ubuntu3.42.6.3-1ubuntu3.52.6.3-1ubuntu3.62.6.3-1ubuntu3.82.6.3-1ubuntu3.9
 None known
sssd
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.9.1-2ubuntu22.9.1-2ubuntu32.9.2-1ubuntu22.9.4-1ubuntu12.9.4-1.1ubuntu3
Show 10 moreShow less
2.9.4-1.1ubuntu52.9.4-1.1ubuntu62.9.4-1.1ubuntu6.12.9.4-1.1ubuntu6.22.9.4-1.1ubuntu6.32.9.4-1.1ubuntu6.42.9.4-1.1ubuntu6.52.9.4-1.1ubuntu6.62.9.4-1.1ubuntu6.72.9.4-1.1ubuntu6.8
 None known
sssd
Ubuntu:26.10
 All versions, plus listed versions
2.12.0-1ubuntu52.12.0-4ubuntu12.12.0-4ubuntu22.12.0-4ubuntu32.12.0-4ubuntu4
 None known
sssd
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.10.1-2ubuntu52.10.1-2ubuntu72.12.0-1ubuntu32.12.0-1ubuntu42.12.0-1ubuntu5
Show 5 moreShow less
2.12.0-1ubuntu5.12.12.0-1ubuntu5.22.12.0-1ubuntu5.32.12.0-1ubuntu5.42.12.0-1ubuntu5.5
 None known

History

History
RecordedChangedSources
affectedOSV
affectedOSV
affectedEUVD, NVD
productsCVE List
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-104036 is a medium vulnerability (CVSS 5.8) in Red Hat Enterprise Linux 10, published October 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.09%, the 0th percentile. Fixed in sssd 2.6.1-34.oe2203sp4.

References

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