7.8

CVE-2023-53088

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

mptcp: fix UaF in listener shutdown

As reported by Christoph after having refactored the passive
socket initialization, the mptcp listener shutdown path is prone
to an UaF issue.

  BUG: KASAN: use-after-free in _raw_spin_lock_bh+0x73/0xe0
  Write of size 4 at addr ffff88810cb23098 by task syz-executor731/1266

  CPU: 1 PID: 1266 Comm: syz-executor731 Not tainted 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   <TASK>
   dump_stack_lvl+0x6e/0x91
   print_report+0x16a/0x46f
   kasan_report+0xad/0x130
   kasan_check_range+0x14a/0x1a0
   _raw_spin_lock_bh+0x73/0xe0
   subflow_error_report+0x6d/0x110
   sk_error_report+0x3b/0x190
   tcp_disconnect+0x138c/0x1aa0
   inet_child_forget+0x6f/0x2e0
   inet_csk_listen_stop+0x209/0x1060
   __mptcp_close_ssk+0x52d/0x610
   mptcp_destroy_common+0x165/0x640
   mptcp_destroy+0x13/0x80
   __mptcp_destroy_sock+0xe7/0x270
   __mptcp_close+0x70e/0x9b0
   mptcp_close+0x2b/0x150
   inet_release+0xe9/0x1f0
   __sock_release+0xd2/0x280
   sock_close+0x15/0x20
   __fput+0x252/0xa20
   task_work_run+0x169/0x250
   exit_to_user_mode_prepare+0x113/0x120
   syscall_exit_to_user_mode+0x1d/0x40
   do_syscall_64+0x48/0x90
   entry_SYSCALL_64_after_hwframe+0x72/0xdc

The msk grace period can legitly expire in between the last
reference count dropped in mptcp_subflow_queue_clean() and
the later eventual access in inet_csk_listen_stop()

After the previous patch we don't need anymore special-casing
msk listener socket cleanup: the mptcp worker will process each
of the unaccepted msk sockets.

Just drop the now unnecessary code.

Please note this commit depends on the two parent ones:

  mptcp: refactor passive socket initialization
  mptcp: use the workqueue to destroy unaccepted sockets
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Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.18.10 < 5.19
Linux ≫ Linux Kernel Version >= 5.19.1 < 6.1.22
Linux ≫ Linux Kernel Version >= 6.2 < 6.2.8
Linux ≫ Linux Kernel Version5.19 Update-
Linux ≫ Linux Kernel Version5.19 Updaterc5
Linux ≫ Linux Kernel Version5.19 Updaterc6
Linux ≫ Linux Kernel Version5.19 Updaterc7
Linux ≫ Linux Kernel Version5.19 Updaterc8
Linux ≫ Linux Kernel Version6.3 Updaterc1
Linux ≫ Linux Kernel Version6.3 Updaterc2
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.01% 0.018
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.