CVE-2025-40258
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-40258
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40258.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-40258
- Downstream
- Published
- 2025-12-04T16:08:19.176Z
- Modified
- 2025-12-05T12:36:11.296824Z
- Summary
- mptcp: fix race condition in mptcp_schedule_work()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix race condition in mptcpschedulework()
syzbot reported use-after-free in mptcpschedulework() [1]
Issue here is that mptcpschedulework() schedules a work, then gets a refcount on sk->skrefcnt if the work was scheduled. This refcount will be released by mptcpworker().
[A] if (schedulework(...)) { [B] sockhold(sk); return true; }
Problem is that mptcp_worker() can run immediately and complete before [B]
We need instead :
sock_hold(sk); if (schedule_work(...)) return true; sock_put(sk);[1] refcountt: addition on 0; use-after-free. WARNING: CPU: 1 PID: 29 at lib/refcount.c:25 refcountwarnsaturate+0xfa/0x1d0 lib/refcount.c:25 Call Trace: <TASK> _refcountadd include/linux/refcount.h:-1 [inline] _refcountinc include/linux/refcount.h:366 [inline] refcountinc include/linux/refcount.h:383 [inline] sockhold include/net/sock.h:816 [inline] mptcpschedulework+0x164/0x1a0 net/mptcp/protocol.c:943 mptcptouttimer+0x21/0xa0 net/mptcp/protocol.c:2316 calltimerfn+0x17e/0x5f0 kernel/time/timer.c:1747 expiretimers kernel/time/timer.c:1798 [inline] _runtimers kernel/time/timer.c:2372 [inline] _runtimerbase+0x648/0x970 kernel/time/timer.c:2384 runtimerbase kernel/time/timer.c:2393 [inline] runtimersoftirq+0xb7/0x180 kernel/time/timer.c:2403 handlesoftirqs+0x22f/0x710 kernel/softirq.c:622 _dosoftirq kernel/softirq.c:656 [inline] runktimerd+0xcf/0x190 kernel/softirq.c:1138 smpbootthreadfn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 retfromfork+0x4bc/0x870 arch/x86/kernel/process.c:158 retfromforkasm+0x1a/0x30 arch/x86/entry/entry_64.S:245
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40258.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea
- https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4
- https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309
- https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40258.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-40258
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3b1d6210a9577369103330b0d802b0bf74b65e7fFixed8f9ba1a99a89feef9b5867c15a0141a97e893309Fixedac28dfddedf6f209190950fc71bcff65ec4ab47bFixed3fc7723ed01d1130d4bf7063c50e0af60ecccbb4Fixed035bca3f017ee9dea3a5a756e77a6f7138cc6eea