- Description
- Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphaned MSG_OOB sockets hit unix_gc(), the garbage collector still calls kfree_skb() as if OOB SKBs held two references; on Ubuntu Linux 6.8 (Noble Numbat) kernel tree, they have only the queue reference, so the buffer is freed while still reachable and subsequent queue walks dereference freed memory, yielding a reliable local privilege escalation (LPE) caused by a use-after-free (UAF). Ubuntu builds that have already taken the new GC stack from commit 4090fa373f0e, and mainline Linux kernels shipping that infrastructure are unaffected because they no longer execute the legacy collector path. This issue affects Ubuntu Linux from 6.8.0-56.58 before 6.8.0-84.84.
- Source
- security@ubuntu.com
- NVD status
- Awaiting Analysis
CVSS 4.0
- Type
- Secondary
- Base score
- 7.1
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- HIGH
- security@ubuntu.com
- CWE-416
- Hype score
- Not currently trending
CVE-2025-13350 for Ubuntu Linux kernel https://t.co/ySypcE8GeF Incorrectly backported patch that caused [Ubuntu] to mix an old-style with a new-style garbage collector for Unix Domain Sockets. If you consume the upstream kernel directly, you're fine.
@oss_security
9 Mar 2026
592 Impressions
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6 Likes
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CVE-2025-13350 Local Privilege Escalation in Ubuntu Linux 6.8 via AF_UNIX Garbage Collector UAF https://t.co/efDvz4m7fV
@VulmonFeeds
6 Mar 2026
83 Impressions
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https://t.co/eZoa3NJDZ6 (CVE-2025-13350) is for: https://t.co/Y2JYEOpylc from last year
@spendergrsec
5 Mar 2026
1574 Impressions
0 Retweets
22 Likes
16 Bookmarks
1 Reply
0 Quotes
CVE-2025-13350 Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphan… https://t.co/GgdQgK6knI
@CVEnew
5 Mar 2026
97 Impressions
0 Retweets
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0 Quotes