CVE-2026-68151

What the bug is

The program header scan handles PT_INTERP from a switch nested in the scan loop, so its break leaves the switch and not the loop. A binary carrying more than one PT_INTERP runs the case again and overwrites both interpreter_name and interpreter. The previous name allocation leaks and so does the previous interpreter reference, along with the write denial open_exec() took on it. The denial is never released, so the file stays unwritable for as long as the system runs. An unprivileged caller reaches this with a crafted binary and repeats it at will. binfmt_elf stops at the first PT_INTERP. Do the same here. The flaw dates back to the driver's introduction in the pre-git history tree introduced in v2.6.11 by 91808d6ebe39 ("[PATCH] FRV: Add FDPIC ELF binary format driver").

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

fs/binfmt_elf_fdpic.c

What this is

EXEC & BINFMT API, ELFMAINTAINERS section matched on fs/*binfmt_*.c · linux-mm@kvack.org · Supported

Kernel module

none to look for. The file would have gone into binfmt_elf_fdpic, and Debian does not compile it into that module, so finding binfmt_elf_fdpic in lsmod would say nothing about this CVE.

Check it on the machine

grep -w CONFIG_BINFMT_ELF_FDPIC /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switch

CONFIG_BINFMT_ELF_FDPIC

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-08-10 (2 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.18%, higher than 7.5% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

fs

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
2.6.12	5.10.265	9854538349aa
2.6.12	5.15.216	3c31397b0a75
2.6.12	6.1.183	849a7bd9d266
2.6.12	6.6.148	e4563e07ef5c
2.6.12	6.12.101	21eaf5594a33
2.6.12	6.18.42	89b9121c3b01
2.6.12	7.1.6	69ecc199880b
2.6.12	7.2	3349ef6a366a

Debian advisories