CVE-2025-39913 (GCVE-0-2025-39913)
Vulnerability from cvelistv5
Published
2025-10-01 07:44
Modified
2025-10-02 13:26
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork.
syzbot reported the splat below. [0]
The repro does the following:
1. Load a sk_msg prog that calls bpf_msg_cork_bytes(msg, cork_bytes)
2. Attach the prog to a SOCKMAP
3. Add a socket to the SOCKMAP
4. Activate fault injection
5. Send data less than cork_bytes
At 5., the data is carried over to the next sendmsg() as it is
smaller than the cork_bytes specified by bpf_msg_cork_bytes().
Then, tcp_bpf_send_verdict() tries to allocate psock->cork to hold
the data, but this fails silently due to fault injection + __GFP_NOWARN.
If the allocation fails, we need to revert the sk->sk_forward_alloc
change done by sk_msg_alloc().
Let's call sk_msg_free() when tcp_bpf_send_verdict fails to allocate
psock->cork.
The "*copied" also needs to be updated such that a proper error can
be returned to the caller, sendmsg. It fails to allocate psock->cork.
Nothing has been corked so far, so this patch simply sets "*copied"
to 0.
[0]:
WARNING: net/ipv4/af_inet.c:156 at inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156, CPU#1: syz-executor/5983
Modules linked in:
CPU: 1 UID: 0 PID: 5983 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156
Code: 0f 0b 90 e9 62 fe ff ff e8 7a db b5 f7 90 0f 0b 90 e9 95 fe ff ff e8 6c db b5 f7 90 0f 0b 90 e9 bb fe ff ff e8 5e db b5 f7 90 <0f> 0b 90 e9 e1 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9f fc
RSP: 0018:ffffc90000a08b48 EFLAGS: 00010246
RAX: ffffffff8a09d0b2 RBX: dffffc0000000000 RCX: ffff888024a23c80
RDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000
RBP: 0000000000000fff R08: ffff88807e07c627 R09: 1ffff1100fc0f8c4
R10: dffffc0000000000 R11: ffffed100fc0f8c5 R12: ffff88807e07c380
R13: dffffc0000000000 R14: ffff88807e07c60c R15: 1ffff1100fc0f872
FS: 00005555604c4500(0000) GS:ffff888125af1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555604df5c8 CR3: 0000000032b06000 CR4: 00000000003526f0
Call Trace:
<IRQ>
__sk_destruct+0x86/0x660 net/core/sock.c:2339
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
</IRQ>
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 Version: 4f738adba30a7cfc006f605707e7aee847ffefa0 |
||
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"net/ipv4/tcp_bpf.c"
],
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],
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"vendor": "Linux",
"versions": [
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"version": "4.17"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.300",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.245",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.194",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.107",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.48",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.300",
"versionStartIncluding": "4.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
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},
{
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},
{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock-\u003ecork.\n\nsyzbot reported the splat below. [0]\n\nThe repro does the following:\n\n 1. Load a sk_msg prog that calls bpf_msg_cork_bytes(msg, cork_bytes)\n 2. Attach the prog to a SOCKMAP\n 3. Add a socket to the SOCKMAP\n 4. Activate fault injection\n 5. Send data less than cork_bytes\n\nAt 5., the data is carried over to the next sendmsg() as it is\nsmaller than the cork_bytes specified by bpf_msg_cork_bytes().\n\nThen, tcp_bpf_send_verdict() tries to allocate psock-\u003ecork to hold\nthe data, but this fails silently due to fault injection + __GFP_NOWARN.\n\nIf the allocation fails, we need to revert the sk-\u003esk_forward_alloc\nchange done by sk_msg_alloc().\n\nLet\u0027s call sk_msg_free() when tcp_bpf_send_verdict fails to allocate\npsock-\u003ecork.\n\nThe \"*copied\" also needs to be updated such that a proper error can\nbe returned to the caller, sendmsg. It fails to allocate psock-\u003ecork.\nNothing has been corked so far, so this patch simply sets \"*copied\"\nto 0.\n\n[0]:\nWARNING: net/ipv4/af_inet.c:156 at inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156, CPU#1: syz-executor/5983\nModules linked in:\nCPU: 1 UID: 0 PID: 5983 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\nRIP: 0010:inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156\nCode: 0f 0b 90 e9 62 fe ff ff e8 7a db b5 f7 90 0f 0b 90 e9 95 fe ff ff e8 6c db b5 f7 90 0f 0b 90 e9 bb fe ff ff e8 5e db b5 f7 90 \u003c0f\u003e 0b 90 e9 e1 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9f fc\nRSP: 0018:ffffc90000a08b48 EFLAGS: 00010246\nRAX: ffffffff8a09d0b2 RBX: dffffc0000000000 RCX: ffff888024a23c80\nRDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000\nRBP: 0000000000000fff R08: ffff88807e07c627 R09: 1ffff1100fc0f8c4\nR10: dffffc0000000000 R11: ffffed100fc0f8c5 R12: ffff88807e07c380\nR13: dffffc0000000000 R14: ffff88807e07c60c R15: 1ffff1100fc0f872\nFS: 00005555604c4500(0000) GS:ffff888125af1000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005555604df5c8 CR3: 0000000032b06000 CR4: 00000000003526f0\nCall Trace:\n \u003cIRQ\u003e\n __sk_destruct+0x86/0x660 net/core/sock.c:2339\n rcu_do_batch kernel/rcu/tree.c:2605 [inline]\n rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861\n handle_softirqs+0x286/0x870 kernel/softirq.c:579\n __do_softirq kernel/softirq.c:613 [inline]\n invoke_softirq kernel/softirq.c:453 [inline]\n __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:696\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]\n sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052\n \u003c/IRQ\u003e"
}
],
"providerMetadata": {
"dateUpdated": "2025-10-02T13:26:46.411Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/08f58d10f5abf11d297cc910754922498c921f91"
},
{
"url": "https://git.kernel.org/stable/c/05366527f44cf4b884f3d9462ae8009be9665856"
},
{
"url": "https://git.kernel.org/stable/c/7429b8b9bfbc276fd304fbaebc405f46b421fedf"
},
{
"url": "https://git.kernel.org/stable/c/9c2a6456bdf9794474460d885c359b6c4522d6e3"
},
{
"url": "https://git.kernel.org/stable/c/66bcb04a441fbf15d66834b7e3eefb313dd750c8"
},
{
"url": "https://git.kernel.org/stable/c/539920180c55f5e13a2488a2339f94e6b8cb69e0"
},
{
"url": "https://git.kernel.org/stable/c/de89e58368f8f07df005ecc1c86ad94898a999f2"
},
{
"url": "https://git.kernel.org/stable/c/a3967baad4d533dc254c31e0d221e51c8d223d58"
}
],
"title": "tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock-\u003ecork.",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39913",
"datePublished": "2025-10-01T07:44:36.244Z",
"dateReserved": "2025-04-16T07:20:57.147Z",
"dateUpdated": "2025-10-02T13:26:46.411Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39913\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T08:15:34.390\",\"lastModified\":\"2025-10-02T19:12:17.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock-\u003ecork.\\n\\nsyzbot reported the splat below. [0]\\n\\nThe repro does the following:\\n\\n 1. Load a sk_msg prog that calls bpf_msg_cork_bytes(msg, cork_bytes)\\n 2. Attach the prog to a SOCKMAP\\n 3. Add a socket to the SOCKMAP\\n 4. Activate fault injection\\n 5. Send data less than cork_bytes\\n\\nAt 5., the data is carried over to the next sendmsg() as it is\\nsmaller than the cork_bytes specified by bpf_msg_cork_bytes().\\n\\nThen, tcp_bpf_send_verdict() tries to allocate psock-\u003ecork to hold\\nthe data, but this fails silently due to fault injection + __GFP_NOWARN.\\n\\nIf the allocation fails, we need to revert the sk-\u003esk_forward_alloc\\nchange done by sk_msg_alloc().\\n\\nLet\u0027s call sk_msg_free() when tcp_bpf_send_verdict fails to allocate\\npsock-\u003ecork.\\n\\nThe \\\"*copied\\\" also needs to be updated such that a proper error can\\nbe returned to the caller, sendmsg. It fails to allocate psock-\u003ecork.\\nNothing has been corked so far, so this patch simply sets \\\"*copied\\\"\\nto 0.\\n\\n[0]:\\nWARNING: net/ipv4/af_inet.c:156 at inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156, CPU#1: syz-executor/5983\\nModules linked in:\\nCPU: 1 UID: 0 PID: 5983 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\\nRIP: 0010:inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156\\nCode: 0f 0b 90 e9 62 fe ff ff e8 7a db b5 f7 90 0f 0b 90 e9 95 fe ff ff e8 6c db b5 f7 90 0f 0b 90 e9 bb fe ff ff e8 5e db b5 f7 90 \u003c0f\u003e 0b 90 e9 e1 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9f fc\\nRSP: 0018:ffffc90000a08b48 EFLAGS: 00010246\\nRAX: ffffffff8a09d0b2 RBX: dffffc0000000000 RCX: ffff888024a23c80\\nRDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000\\nRBP: 0000000000000fff R08: ffff88807e07c627 R09: 1ffff1100fc0f8c4\\nR10: dffffc0000000000 R11: ffffed100fc0f8c5 R12: ffff88807e07c380\\nR13: dffffc0000000000 R14: ffff88807e07c60c R15: 1ffff1100fc0f872\\nFS: 00005555604c4500(0000) GS:ffff888125af1000(0000) knlGS:0000000000000000\\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00005555604df5c8 CR3: 0000000032b06000 CR4: 00000000003526f0\\nCall Trace:\\n \u003cIRQ\u003e\\n __sk_destruct+0x86/0x660 net/core/sock.c:2339\\n rcu_do_batch kernel/rcu/tree.c:2605 [inline]\\n rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861\\n handle_softirqs+0x286/0x870 kernel/softirq.c:579\\n __do_softirq kernel/softirq.c:613 [inline]\\n invoke_softirq kernel/softirq.c:453 [inline]\\n __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680\\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:696\\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]\\n sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052\\n \u003c/IRQ\u003e\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05366527f44cf4b884f3d9462ae8009be9665856\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/08f58d10f5abf11d297cc910754922498c921f91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/539920180c55f5e13a2488a2339f94e6b8cb69e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66bcb04a441fbf15d66834b7e3eefb313dd750c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7429b8b9bfbc276fd304fbaebc405f46b421fedf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c2a6456bdf9794474460d885c359b6c4522d6e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3967baad4d533dc254c31e0d221e51c8d223d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de89e58368f8f07df005ecc1c86ad94898a999f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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