CVE-2022-49198

published 2025-02-26

CVE-2022-49198: In the Linux kernel, the following vulnerability has been resolved: mptcp: Fix crash due to tcp_tsorted_anchor was initialized before release skb Got crash…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

mptcp: Fix crash due to tcp_tsorted_anchor was initialized before release skb

Got crash when doing pressure test of mptcp:

dst_release: dst:ffffa06ce6e5c058 refcnt:-1
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffffa06ce6e5c058
PGD 190a01067 P4D 190a01067 PUD 43fffb067 PMD 22e403063 PTE 8000000226e5c063
Oops: 0011 [#1] SMP PTI
CPU: 7 PID: 7823 Comm: kworker/7:0 Kdump: loaded Tainted: G E
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.2.1 04/01/2014
Call Trace:
? skb_release_head_state+0x68/0x100
? skb_release_all+0xe/0x30
? kfree_skb+0x32/0xa0
? mptcp_sendmsg_frag+0x57e/0x750
? __mptcp_retrans+0x21b/0x3c0
? __switch_to_asm+0x35/0x70
? mptcp_worker+0x25e/0x320
? process_one_work+0x1a7/0x360
? worker_thread+0x30/0x390
? create_worker+0x1a0/0x1a0
? kthread+0x112/0x130
? kthread_flush_work_fn+0x10/0x10
? ret_from_fork+0x35/0x40

In __mptcp_alloc_tx_skb skb was allocated and skb->tcp_tsorted_anchor will
be initialized, in under memory pressure situation sk_wmem_schedule will
return false and then kfree_skb. In this case skb->_skb_refdst is not null
because_skb_refdst and tcp_tsorted_anchor are stored in the same mem, and
kfree_skb will try to release dst and cause crash.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.17.3-1 (bookworm)	linux 5.17.3-1 (bookworm)
linux	linux	—	—
linux	linux	>= 289f2f58266777f45a52cd55dea96d736e6244c9 < af61a8f7603926c26158153d0a0755764d82657c	af61a8f7603926c26158153d0a0755764d82657c
linux	linux	>= f70cad1085d1e01d3ec73c1078405f906237feee < 752add6f5ce5305e55d8bda4ac8d69be3a09f14d	752add6f5ce5305e55d8bda4ac8d69be3a09f14d
linux	linux	>= f70cad1085d1e01d3ec73c1078405f906237feee < 4d54181eba4b077fb74033a7186898ad4000a7a5	4d54181eba4b077fb74033a7186898ad4000a7a5
linux	linux	>= f70cad1085d1e01d3ec73c1078405f906237feee < 3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc	3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 5.16 < 5.16.19	5.16.19
linux	linux_kernel	>= 5.17 < 5.17.2	5.17.2

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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