Bug 2513242 (CVE-2026-68144) - CVE-2026-68144 kernel: phonet: pep: fix use-after-free in pep_get_sb()
Summary: CVE-2026-68144 kernel: phonet: pep: fix use-after-free in pep_get_sb()
Keywords:
Status: NEW
Alias: CVE-2026-68144
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-10 12:26 UTC by OSIDB Bzimport
Modified: 2026-08-26 12:32 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-08-10 12:26:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

phonet: pep: fix use-after-free in pep_get_sb()

pep_get_sb() doesn't consider that pskb_may_pull() might have relocated
the skb data, and continue to access the older pointer, causing UAF.

Reproduced under KASAN:

  BUG: KASAN: slab-use-after-free in pep_get_sb+0x234/0x3b0
  Read of size 1 at addr ff11000105510f50 by task repro/157
   pep_get_sb+0x234/0x3b0
   pipe_handler_do_rcv+0x5f7/0xa10
   pep_do_rcv+0x203/0x410
   __sk_receive_skb+0x471/0x4a0
   phonet_rcv+0x5b3/0x6c0
   __netif_receive_skb+0xcc/0x1d0

Refetch the header with skb_header_pointer() after pskb_may_pull(), so
the possibly stale pointer is no longer dereferenced. There are better
ways to solve this, but, this is the less instrusive one.
Comment 6 Mauro Matteo Cascella 2026-08-21 20:52:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081000-CVE-2026-68144-39ce@gregkh/T
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