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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2022-50536

bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data In tcp_bpf_send_verdict() redirection, the eval variable is assigned to __SK_REDIRECT after the apply_bytes data is sent, if msg has more_data, sock_put() will be called multiple times. We should reset the eval variable to __SK_NONE every time more_data starts. This causes: IPv4: Attempt to release TCP socket in state 1 00000000b4c925d7 ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110 Modules linked in: CPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1 Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014 Call Trace: <TASK> __tcp_transmit_skb+0xa1b/0xb90 ? __alloc_skb+0x8c/0x1a0 ? __kmalloc_node_track_caller+0x184/0x320 tcp_write_xmit+0x22a/0x1110 __tcp_push_pending_frames+0x32/0xf0 do_tcp_sendpages+0x62d/0x640 tcp_bpf_push+0xae/0x2c0 tcp_bpf_sendmsg_redir+0x260/0x410 ? preempt_count_add+0x70/0xa0 tcp_bpf_send_verdict+0x386/0x4b0 tcp_bpf_sendmsg+0x21b/0x3b0 sock_sendmsg+0x58/0x70 __sys_sendto+0xfa/0x170 ? xfd_validate_state+0x1d/0x80 ? switch_fpu_return+0x59/0xe0 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 5f0bfe21c853917aae4bc5a70fe57ddb4054443e to < 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10affected
  • 15dec6d8f8642a26d6a272af2d7f9877df8f02b8 to < 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6affected
  • cd9733f5d75c94a32544d6ce5be47e14194cf137 to < 8786bde11a4f31b63b3036731df0b47337a7a245affected
  • cd9733f5d75c94a32544d6ce5be47e14194cf137 to < 578a7628b838a3ac8ad61deaab5a816ff032ac13affected
  • cd9733f5d75c94a32544d6ce5be47e14194cf137 to < 113236e8f49f262f318c00ebb14b15f4834e87c1affected
  • cd9733f5d75c94a32544d6ce5be47e14194cf137 to < 7a9841ca025275b5b0edfb0b618934abb6ceec15affected
  • 6f226ffe4458ea3b8c33287cb8c86f87dc198dceaffected
  • 5.4.157 to < 5.4.229affected
  • 5.10.77 to < 5.10.163affected
  • 5.14.16 to < 5.15affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 5.4.229 to ≤ 5.4.*unaffected
  • 5.10.163 to ≤ 5.10.*unaffected
  • 5.15.86 to ≤ 5.15.*unaffected
  • 6.0.16 to ≤ 6.0.*unaffected
  • 6.1.2 to ≤ 6.1.*unaffected
  • 6.2 to ≤ *unaffected

References