CVE-2026-8933Disclosure

HIGHCVSS 7.8 · HIGH

Exploitation observed; activity peaked at 14 mentions and remains active

Immediate actions

Patch affected systems immediately
Assume compromise if assets are exposed
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: Immediate (within 24h)

NVD description

A local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority.

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7.8/ 10 priority

Sources & remediation

Other references

https://ubuntu.com/security/CVE-2026-8933

Weakness type (CWE)

CWE-250

Priority

HIGH

Exploitation

ACTIVE

PoC

YES

Patch

AVAILABLE

Momentum

DECLINING

Threat summary

Active exploitation appears in 2 classified signals
Public PoC and exploit tooling are both present
Patch or workaround signal is available
49 mentions across 12 observed days

What's happening

Active exploitation reported across 2 signals
Exploit tool or code specified in 5 signals
PoC mentioned or linked in 4 signals
Patch or workaround mentioned in 18 signals
Technical details provided in 41 signals
Disclosure: 26 classified signals
General: 5 classified signals
Peaked 9d ago at 14 mentions (2026-07-23); latest day: 1
49 total mentions across 12 days

Deep dive

Activity timeline49 mentions / 12d

Signal classification5 categories

Disclosure

2653.1%

Patch

1530.6%

General

510.2%

Exploit

24.1%

Active Exploitation

12.0%

Referenced assets30 URLs

By indicator

Classification over time

Date	Total	Labels

2026-07-21	7	Disclosure5Exploit1Patch1
2026-07-22	12	Active Exploitation1Disclosure6Patch5
2026-07-23	14	Disclosure9General1Patch4
2026-07-24	7	Disclosure4General2Patch1
2026-07-26	1	Disclosure1
2026-07-27	2	General1Patch1
2026-07-28	1	Disclosure1
2026-07-31	1	Patch1
2026-08-10	1	Patch1
2026-08-21	1	Patch1
2026-09-23	1	Exploit1
2026-09-25	1	General1

Full discourse20 posts

The Hacker News@TheHackersNews90d
Disclosure
🚨 A flaw in Ubuntu’s snap-confine could turn local user access into root. CVE-2026-8933 chains FUSE and symlink race conditions to plant malicious udev rules and execute commands as root. Default Ubuntu #Linux Desktop 24.04, 25.10, and 26.04 installations are affected. Read how the exploit works: https://thehackernews.com/2026/07/ubuntu-snap-confine-flaw-could-give.html
Post summary
A newly disclosed CVE (CVE-2026-8933) in Ubuntu’s snap-confine allows local privilege escalation by exploiting FUSE and symlink race conditions to inject malicious udev rules and gain root access.
54511684948.3K
2.3M followersView on X
portbuster@portbuster133727d
Exploit
lpe-toolkit has been updated with new LPE exploits! New exploits added: - RefluXFS CVE-2026-64600 - CrackArmor CVE-2026-23268 - skb_shift CVE-2026-43503 - GRO Flag Loss CVE-2026-43503 - snap-confine CVE-2026-8933 https://github.com/portbuster1337/lpe-toolkit/releases/tag/v1.4.0
Post summary
The tweet announces a release update to the lpe-toolkit repository containing five new Local Privilege Escalation (LPE) exploits associated with specific CVEs and links directly to the source code. This indicates the availability of functional exploit tooling, with no evidence of active exploitation or vendor patches.
0230112668.6K
425 followersView on X
IT-Connect.fr@ITConnect_fr90d
Disclosure
⚠️ Quand une mise à jour sécurité ouvre la porte au root… 👀 Un score CVSS de 7.8 sur 10, et un accès root à la clé, voici ce qui se cache derrière la CVE-2026-8933 👉 https://www.it-connect.fr/cve-2026-8933-ubuntu-snap-confine-acces-root/ #Cybersecurite #Linux #Ubuntu https://www.it-connect.fr/cve-2026-8933-ubuntu-snap-confine-acces-root/
Post summary
The post announces CVE‑2026‑8933, noting a 7.8 CVSS score and root access potential, but offers no PoC, exploit details, or patch information.
21211552.9K
11.6K followersView on X
Anderson Nascimento@andersonc0d391d
Disclosure
Local Privilege Escalation in set-capabilities versions of snap-confine (CVE-2026-8933) https://seclists.org/oss-sec/2026/q3/192
Post summary
The post announces a local privilege escalation vulnerability (CVE-2026-8933) in snap‑confine set-capabilities versions, but does not provide PoC, exploit code, or patch information.
011961.6K
4.5K followersView on X
Qualys@qualys91d
Disclosure
Another important vulnerability disclosure and piece of research from the Qualys Threat Research Unit (#TRU) 🎯 The TRU team just disclosed CVE-2026-8933, a local privilege escalation in snap-confine affecting default installs of Ubuntu Desktop 24.04, 25.10, and 26.04. A race condition between a FUSE mount and a symlink attack lets an unprivileged user chain their way to full root. No special config required, no attacker prerequisites beyond local access. Qualys TRU worked hand-in-hand with the Ubuntu Security Team (shoutout Eduardo Barretto & Zygmunt Krynicki at @Canonical) through coordinated disclosure, with patches shipped before going public. Patch snapd now if you're on affected Ubuntu releases. Full technical breakdown: https://blog.qualys.com/vulnerabilities-threat-research/2026/07/21/cve-2026-8933-snap-confine-local-privilege-escalation
Post summary
Qualys TRU discloses CVE-2026‑8933, a race‑condition–based local privilege escalation in snap‑confine on Ubuntu Desktop 24.04–26.04, and notes that a patch is available for affected releases.
031902.0K
34.3K followersView on X
Vivek | Cybersecurity@VivekIntel90d
Disclosure
CVE-2026-8933: Ubuntu security flaw breaks Snap sandbox protections https://securityaffairs.com/195833/security/cve-2026-8933-ubuntu-security-flaw-breaks-snap-sandbox-protections.html
Post summary
The text announces CVE-2026-8933, identifying an Ubuntu flaw that compromises Snap sandbox protections, with no evidence of exploits, active attacks, or fixes provided.
00074931
18.1K followersView on X
보안뉴스@boannews87d
Disclosure
리눅스 기반의 대표적인 오픈소스 운영체제 우분투 데스크톱24.04, 25.10, 26.04의 스냅-컨파인(snap-confine) 구성 요소에서 고위험 권한 상승 취약점(CVE-2026-8933)이 발견됐다. https://v.daum.net/v/20260725125844703
Post summary
Ubuntu Desktop’s snap-confine component has a high‑risk privilege escalation vulnerability (CVE‑2026‑8933) identified, with no PoC, exploit tool, or active exploitation reported.
052301.0K
3.3K followersView on X
Es Geeks@EsGeeks90d
Patch
⚠️ CVE-2026-8933: snap-confine en Ubuntu Desktop da root a cualquier usuario local. Afecta 24.04/25.10/26.04. Actualiza snapd ya. #Ubuntu #CVE #Linux https://t.co/eZn3ohHB1A
Post summary
CVE-2026-8933 allows local users to gain root by abusing snap‑confine on Ubuntu Desktop. The fix is to update snapd to the latest version.
11062756
22.4K followersView on X
Daily CyberSecurity@Daily_CyberSec89d
Disclosure
Discover how the CVE-2026-8933 snap-confine vulnerability in Ubuntu Desktop allows local users to bypass sandbox controls and gain root privileges. #CVE20268933 #SnapConfine #UbuntuSecurity #PrivilegeEscalation #LinuxKernel http://meterpreter.org/cve-2026-8933-snap-confine-vulnerability/
Post summary
The post announces the CVE-2026-8933 snap-confine vulnerability in Ubuntu Desktop, noting that local users can bypass sandbox controls and gain root privileges, but it does not provide patches, active exploitation evidence, or a detailed exploit tool.
01061524
12.9K followersView on X
Open Source Security mailing list@oss_security91d
Patch
snapd: 3 CVE fixes being released https://www.openwall.com/lists/oss-security/2026/07/21/1 CVE-2026-8933: LPE in set-capabilities versions of snap-confine (found by @Qualys) https://www.openwall.com/lists/oss-security/2026/07/21/2 CVE-2024-5300: Unauthorized Access to Hashed Passwords CVE-2026-15226: Omission of setuid Restriction
Post summary
Openwall announces the release of patches for three CVEs in snapd: CVE-2026-8933 (LPE in snap-confine), CVE-2024-5300 (unauthorized access to hashed passwords), and CVE-2026-15226 (setuid restriction omission). No exploitation or PoC details are provided.
02060856
4.7K followersView on X
Daily CyberSecurity@Daily_CyberSec91d
Patch
CVE-2026-8933 is a snap-confine privilege escalation flaw. It gives any user root on default Ubuntu Desktop 26.04, 25.10, and 24.04. Update snapd now. #snapconfine #CVE20268933 #Ubuntu #PrivilegeEscalation #LPE #Linux #Qualys http://securityonline.info/snap-confine-cve-2026-8933/
Post summary
CVE-2026-8933 is a snap‑confine privilege escalation bug affecting Ubuntu Desktop 24.04, 25.10, and 26.04; users are urged to update snapd immediately.
02041485
12.9K followersView on X
kokumօtօ@__kokumoto90d
Disclosure
UbubntuにSnapのサンドボックス脱出の脆弱性。CVE-2026-8933はCVSS スコア7.8の権限昇格で、snap-confineがsetuid-root持てるからケイパビリティモデルに移行された際に作り込まれた競合状態の問題一時ディレクトリにFUSEファイルシステムをマウントすると高権限で書込可能。 https://securityaffairs.com/195833/security/cve-2026-8933-ubuntu-security-flaw-breaks-snap-sandbox-protections.html
Post summary
The article reports CVE-2026-8933, a privilege‑escalation flaw in Ubuntu’s Snap sandbox that introduces a race condition when a temporary FUSE filesystem is mounted, allowing write access with elevated rights.
00032918
7.8K followersView on X
yousukezan@yousukezan91d
Exploit
Ubuntuのsnap-confineに、ローカルユーザーがroot権限を取得できる権限昇格の脆弱性CVE-2026-8933が見つかった。Qualysは動作するエクスプロイトを作成しており、Canonicalは2026年7月21日に修正版を公開した。現時点で実際の悪用は確認されていない。脆弱性は、Snapアプリのサンドボックスを構築するsnap-confineに存在する。Ubuntuでは近年、setuid-rootではなくLinuxのファイルケーパビリティを利用する実装へ変更されていたが、この変更により、snap-confineは一般ユーザー権限で実行されながら高い権限を保持し、生成するファイルの所有者がrootではなく実行ユーザーとなる状態が生じる。この隙を利用すると、攻撃者は競合状態（レースコンディション）を悪用してsnap-confineが書き込むファイルを別の場所へ誘導し、その後root権限で実行されるルールを配置できるという。Qualysは書き込み可能なシステムパスを利用して、最終的にroot権限を取得できることを確認した。影響を受けるのはファイルケーパビリティ方式を採用したsnap-confineで、Ubuntu Desktop 24.04、25.10、26.04の標準構成が該当する。一方、setuid-root方式のビルドは影響を受けない。Canonicalはsnapdの更新を提供しており、利用者には速やかな適用と、更新完了までの間はローカルシェルへのアクセスを信頼できる利用者のみに制限することを推奨している。 https://securityonline.info/snap-confine-cve-2026-8933/
Post summary
CVE-2026-8933 is a local privilege‑escalation bug in snap‑confine; Qualys released a working exploit, Canonical issued a patch on July 21, 2026, and no active wild‑world exploitation has been reported.
000311.1K
14.9K followersView on X
Leonel Marin@LeonelM4126210788d
General
🐧 𝗔𝗟𝗘𝗥𝗧𝗔 𝗟𝗜𝗡𝗨𝗫: 2 fallas críticas de escalamiento de privilegios 🔹 CVE-2026-8933 → Ubuntu Desktop 🔹 CVE-2026-64600 "RefluXFS" → RHEL, CentOS, Rocky, AlmaLinux, Fedora, Amazon Linux Más info 👇👇 https://whatsapp.com/channel/0029VassZ6m7z4kmqDvFZg07/399 #Ciberseguridad #Linux #Colombia https://t.co/CigQfw3Wyv
Post summary
The post announces two critical privilege‑escalation vulnerabilities affecting multiple Linux distros, but provides no technical details, PoC, exploit code, or patch information.
02010165
26 followersView on X
Pierluigi Paganini - Security Affairs@securityaffairs90d
Disclosure
CVE-2026-8933: #Ubuntu security flaw breaks Snap sandbox protections https://securityaffairs.com/195833/security/cve-2026-8933-ubuntu-security-flaw-breaks-snap-sandbox-protections.html #securityaffairs #hacking @qualys
Post summary
The tweet announces the Ubuntu CVE‑2026‑8933, stating it impacts Snap sandbox protections, but offers no evidence of exploit, PoC, patch, or detailed technical data.
02010826
37.6K followersView on X
Günter Born@etguenni88d
General
#Ubuntu Sicherheitslücke https://borncity.com/blog/2026/07/23/ubuntu-sicherheitsluecke-cve-2026-8933/
Post summary
The snippet simply links to a blog post titled "Ubuntu Sicherheitslücke CVE-2026-8933" without providing further information.
01010284
2.8K followersView on X
The Daily Tech Feed@dailytechonx89d
Patch
A critical flaw in Ubuntu's snap-confine component, CVE-2026-8933, allows local users to gain root access on default installations of Ubuntu Desktop 24.04, 25.10, and 26.04. This vulnerability stems from a race condition introduced during a security hardening change in July 2025. Administrators are urged to apply the latest snapd updates immediately to mitigate potential exploitation. #Ubuntu #Snap #CVE20268933 #Security #Linux #Vulnerability #CyberSecurity https://thedailytechfeed.com/ubuntu-snap-vulnerability-grants-root-access-via-race-condition/
Post summary
CVE‑2026‑8933 is a race‑condition flaw in Ubuntu snap‑confine that lets local users gain root; administrators should apply the latest snapd updates to mitigate.
01010125
553 followersView on X
Red Secure Tech Ltd.@redsecuretech90d
Disclosure
Snap-confine local privilege escalation flaw (CVE-2026-8933) gives root access on Ubuntu Desktop. Race conditions allow symlink and FUSE mount attacks. For More: https://www.redsecuretech.co.uk/blog/post/snap-confine-lpe-flaw-gives-root-on-ubuntu-desktops/1341 #SnapConfine #CVE #Ubuntu #PrivilegeEscalation #FUSE #Snapd #Qualys #LinuxSecurity #InfoSec https://t.co/Fhvu99Av0i
Post summary
Snap‑confine local privilege escalation flaw CVE‑2026‑8933 on Ubuntu desktops allows root via race conditions with symlink and FUSE mount attacks; no PoC, exploit, patch, or active exploitation reported.
0101058
69 followersView on X
Diario฿itcoin@DiarioBitcoin90d
Disclosure
🔒💥 ¡ALERTA DE SEGURIDAD EN UBUNTU! Canonical revela 3 vulnerabilidades críticas en snapd que afectan versiones desde Ubuntu 16.04 LTS. CVE-2026-8933 permite escalado de privilegios. CVE-2026-15226 posibilita escape de confinación. CVE-2024-5300 expone contraseñas hasheadas. La seguridad de tus aplicaciones podría estar en riesgo. Es crucial evaluar las instalaciones y tomar medidas.
Post summary
Canonical has announced three critical vulnerabilities in snapd (CVE-2026-8933, CVE-2026-15226, CVE-2024-5300) affecting Ubuntu 16.04 LTS and newer, describing privilege escalation, confinement escape, and hashed password exposure, and urges users to assess and secure their installations.
100101.0K
213.0K followersView on X
Emphere@empherehq85d
Patch
CVE-2026-8933 is a privilege escalation created by a hardening migration. The one-line fix was O_NOFOLLOW. The real fix was four commits, because the race lived in the path design, the legacy self-repair logic, and the fail-open assumptions around /tmp. Full teardown in comments
Post summary
The note announces CVE-2026-8933 as a privilege‑escalation flaw caused by a hardening migration and details the fix using O_NOFOLLOW and a series of commits that address the root race condition.
1000030
7 followersView on X

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What researchers are saying

CVE-2026-8933

Anderson Nascimento[verified]@andersonc0d3Disclosure

The post announces a local privilege escalation vulnerability (CVE-2026-8933) in snap‑confine set-capabilities versions, but does not provide PoC, exploit code, or patch information.

Vivek | Cybersecurity[verified]@VivekIntelDisclosure

The text announces CVE-2026-8933, identifying an Ubuntu flaw that compromises Snap sandbox protections, with no evidence of exploits, active attacks, or fixes provided.

kokumօtօ[verified]@__kokumotoDisclosure

The article reports CVE-2026-8933, a privilege‑escalation flaw in Ubuntu’s Snap sandbox that introduces a race condition when a temporary FUSE filesystem is mounted, allowing write access with elevated rights.

yousukezan[verified]@yousukezanExploit

CVE-2026-8933 is a local privilege‑escalation bug in snap‑confine; Qualys released a working exploit, Canonical issued a patch on July 21, 2026, and no active wild‑world exploitation has been reported.

The Daily Tech Feed[verified]@dailytechonxPatch

CVE‑2026‑8933 is a race‑condition flaw in Ubuntu snap‑confine that lets local users gain root; administrators should apply the latest snapd updates to mitigate.

Diario฿itcoin[verified]@DiarioBitcoinDisclosure

Canonical has announced three critical vulnerabilities in snapd (CVE-2026-8933, CVE-2026-15226, CVE-2024-5300) affecting Ubuntu 16.04 LTS and newer, describing privilege escalation, confinement escape, and hashed password exposure, and urges users to assess and secure their installations.

Emphere[verified]@empherehqPatch

The note announces CVE-2026-8933 as a privilege‑escalation flaw caused by a hardening migration and details the fix using O_NOFOLLOW and a series of commits that address the root race condition.

The Hacker News@TheHackersNewsDisclosure

A newly disclosed CVE (CVE-2026-8933) in Ubuntu’s snap-confine allows local privilege escalation by exploiting FUSE and symlink race conditions to inject malicious udev rules and gain root access.