linux-cve-announce - CVE-2025-38607: bpf: handle jset (if a & b ...) as a jump in CFG computation

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Message-ID: <2025081922-CVE-2025-38607-c6ce@gregkh>
Date: Tue, 19 Aug 2025 19:18:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38607: bpf: handle jset (if a & b ...) as a jump in CFG computation

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

bpf: handle jset (if a & b ...) as a jump in CFG computation

BPF_JSET is a conditional jump and currently verifier.c:can_jump()
does not know about that. This can lead to incorrect live registers
and SCC computation.

E.g. in the following example:

   1: r0 = 1;
   2: r2 = 2;
   3: if r1 & 0x7 goto +1;
   4: exit;
   5: r0 = r2;
   6: exit;

W/o this fix insn_successors(3) will return only (4), a jump to (5)
would be missed and r2 won't be marked as alive at (3).

The Linux kernel CVE team has assigned CVE-2025-38607 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.15 with commit 14c8552db64476ffc27c13dc6652fc0dac31c0ba and fixed in 6.15.10 with commit 65eb166b8636365ad3d6e36d50a7c5edfe6cc66e
	Issue introduced in 6.15 with commit 14c8552db64476ffc27c13dc6652fc0dac31c0ba and fixed in 6.16.1 with commit 261b30ad1516f4b9edd500aa6e8d6315c8fc109a
	Issue introduced in 6.15 with commit 14c8552db64476ffc27c13dc6652fc0dac31c0ba and fixed in 6.17-rc1 with commit 3157f7e2999616ac91f4d559a8566214f74000a5

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-38607
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	kernel/bpf/verifier.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/65eb166b8636365ad3d6e36d50a7c5edfe6cc66e
	https://git.kernel.org/stable/c/261b30ad1516f4b9edd500aa6e8d6315c8fc109a
	https://git.kernel.org/stable/c/3157f7e2999616ac91f4d559a8566214f74000a5