Bug 2389497 (CVE-2025-38607) - CVE-2025-38607 kernel: bpf: handle jset (if a & b ...) as a jump in CFG computation
Summary: CVE-2025-38607 kernel: bpf: handle jset (if a & b ...) as a jump in CFG c...
Keywords:
Status: NEW
Alias: CVE-2025-38607
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-08-19 18:04 UTC by OSIDB Bzimport
Modified: 2025-08-19 21:54 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-08-19 18:04:12 UTC
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).


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