CVE-2022-49973
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: skmsg: Fix wrong last sg check in sk_msg_recvmsg() Fix one kernel NULL pointer dereference as below: [ 224.462334] Call Trace: [ 224.462394] __tcp_bpf_recvmsg+0xd3/0x380 [ 224.462441] ? sock_has_perm+0x78/0xa0 [ 224.462463] tcp_bpf_recvmsg+0x12e/0x220 [ 224.462494] inet_recvmsg+0x5b/0xd0 [ 224.462534] __sys_recvfrom+0xc8/0x130 [ 224.462574] ? syscall_trace_enter+0x1df/0x2e0 [ 224.462606] ? __do_page_fault+0x2de/0x500 [ 224.462635] __x64_sys_recvfrom+0x24/0x30 [ 224.462660] do_syscall_64+0x5d/0x1d0 [ 224.462709] entry_SYSCALL_64_after_hwframe+0x65/0xca In commit 9974d37ea75f ("skmsg: Fix invalid last sg check in sk_msg_recvmsg()"), we change last sg check to sg_is_last(), but in sockmap redirection case (without stream_parser/stream_verdict/ skb_verdict), we did not mark the end of the scatterlist. Check the sk_msg_alloc, sk_msg_page_add, and bpf_msg_push_data functions, they all do not mark the end of sg. They are expected to use sg.end for end judgment. So the judgment of '(i != msg_rx->sg.end)' is added back here.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 11:15:24.673000
Last modified
2026-11-05 20:17:19.360000
View original CVE JSON
{
"id": "CVE-2022-49973",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T11:15:24.673",
"lastModified": "2026-11-05T20:17:19.360",
"vulnStatus": "Analyzed",
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nskmsg: Fix wrong last sg check in sk_msg_recvmsg()\n\nFix one kernel NULL pointer dereference as below:\n\n[ 224.462334] Call Trace:\n[ 224.462394] __tcp_bpf_recvmsg+0xd3/0x380\n[ 224.462441] ? sock_has_perm+0x78/0xa0\n[ 224.462463] tcp_bpf_recvmsg+0x12e/0x220\n[ 224.462494] inet_recvmsg+0x5b/0xd0\n[ 224.462534] __sys_recvfrom+0xc8/0x130\n[ 224.462574] ? syscall_trace_enter+0x1df/0x2e0\n[ 224.462606] ? __do_page_fault+0x2de/0x500\n[ 224.462635] __x64_sys_recvfrom+0x24/0x30\n[ 224.462660] do_syscall_64+0x5d/0x1d0\n[ 224.462709] entry_SYSCALL_64_after_hwframe+0x65/0xca\n\nIn commit 9974d37ea75f (\"skmsg: Fix invalid last sg check in\nsk_msg_recvmsg()\"), we change last sg check to sg_is_last(),\nbut in sockmap redirection case (without stream_parser/stream_verdict/\nskb_verdict), we did not mark the end of the scatterlist. Check the\nsk_msg_alloc, sk_msg_page_add, and bpf_msg_push_data functions, they all\ndo not mark the end of sg. They are expected to use sg.end for end\njudgment. So the judgment of '(i != msg_rx->sg.end)' is added back here."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: skmsg: Corrige la última comprobación sg incorrecta en sk_msg_recvmsg() Corrige una desreferencia de puntero NULL del kernel como se muestra a continuación: [224.462334] Seguimiento de llamadas: [224.462394] __tcp_bpf_recvmsg+0xd3/0x380 [224.462441] ? syscall_trace_enter+0x1df/0x2e0 [ 224.462606] ? __do_page_fault+0x2de/0x500 [ 224.462635] __x64_sys_recvfrom+0x24/0x30 [ 224.462660] do_syscall_64+0x5d/0x1d0 [ 224.462709] entry_SYSCALL_64_after_hwframe+0x65/0xca En el commit 9974d37ea75f (\"skmsg: Corregir la última comprobación de sg no válida en sk_msg_recvmsg()\"), cambiamos la última comprobación de sg a sg_is_last(), pero en el caso de redirección de sockmap (sin stream_parser/stream_verdict/skb_verdict), no marcamos el final de la lista de dispersión. Verifique las funciones sk_msg_alloc, sk_msg_page_add y bpf_msg_push_data; ninguna marca el final de sg. Se espera que usen sg.end para la determinación del final. Por lo tanto, se añade aquí la determinación de '(i != msg_rx->sg.end)'."
}
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