CVE-2022-50536 (GCVE-0-2022-50536)
Vulnerability from cvelistv5 – Published: 2025-10-07 15:21 – Updated: 2025-10-07 15:21
VLAI?
Title
bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data
Summary
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
5f0bfe21c853917aae4bc5a70fe57ddb4054443e , < 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10
(git)
Affected: 15dec6d8f8642a26d6a272af2d7f9877df8f02b8 , < 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6 (git) Affected: cd9733f5d75c94a32544d6ce5be47e14194cf137 , < 8786bde11a4f31b63b3036731df0b47337a7a245 (git) Affected: cd9733f5d75c94a32544d6ce5be47e14194cf137 , < 578a7628b838a3ac8ad61deaab5a816ff032ac13 (git) Affected: cd9733f5d75c94a32544d6ce5be47e14194cf137 , < 113236e8f49f262f318c00ebb14b15f4834e87c1 (git) Affected: cd9733f5d75c94a32544d6ce5be47e14194cf137 , < 7a9841ca025275b5b0edfb0b618934abb6ceec15 (git) Affected: 6f226ffe4458ea3b8c33287cb8c86f87dc198dce (git) |
|||||||
|
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{
"containers": {
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"version": "5.4.229",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.163",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.86",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"cpeMatch": [
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],
"negate": false,
"operator": "OR"
}
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}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix repeated calls to sock_put() when msg has more_data\n\nIn tcp_bpf_send_verdict() redirection, the eval variable is assigned to\n__SK_REDIRECT after the apply_bytes data is sent, if msg has more_data,\nsock_put() will be called multiple times.\n\nWe should reset the eval variable to __SK_NONE every time more_data\nstarts.\n\nThis causes:\n\nIPv4: Attempt to release TCP socket in state 1 00000000b4c925d7\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110\nModules linked in:\nCPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1\nHardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n __tcp_transmit_skb+0xa1b/0xb90\n ? __alloc_skb+0x8c/0x1a0\n ? __kmalloc_node_track_caller+0x184/0x320\n tcp_write_xmit+0x22a/0x1110\n __tcp_push_pending_frames+0x32/0xf0\n do_tcp_sendpages+0x62d/0x640\n tcp_bpf_push+0xae/0x2c0\n tcp_bpf_sendmsg_redir+0x260/0x410\n ? preempt_count_add+0x70/0xa0\n tcp_bpf_send_verdict+0x386/0x4b0\n tcp_bpf_sendmsg+0x21b/0x3b0\n sock_sendmsg+0x58/0x70\n __sys_sendto+0xfa/0x170\n ? xfd_validate_state+0x1d/0x80\n ? switch_fpu_return+0x59/0xe0\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x37/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd"
}
],
"providerMetadata": {
"dateUpdated": "2025-10-07T15:21:03.056Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10"
},
{
"url": "https://git.kernel.org/stable/c/28e4a763cd4a2b1a78852216ef4bd7df3a05cec6"
},
{
"url": "https://git.kernel.org/stable/c/8786bde11a4f31b63b3036731df0b47337a7a245"
},
{
"url": "https://git.kernel.org/stable/c/578a7628b838a3ac8ad61deaab5a816ff032ac13"
},
{
"url": "https://git.kernel.org/stable/c/113236e8f49f262f318c00ebb14b15f4834e87c1"
},
{
"url": "https://git.kernel.org/stable/c/7a9841ca025275b5b0edfb0b618934abb6ceec15"
}
],
"title": "bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50536",
"datePublished": "2025-10-07T15:21:03.056Z",
"dateReserved": "2025-10-07T15:15:38.666Z",
"dateUpdated": "2025-10-07T15:21:03.056Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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