CVE-2025-39913 (GCVE-0-2025-39913)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:44 – Updated: 2025-11-03 17:44
VLAI?
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>
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 08f58d10f5abf11d297cc910754922498c921f91 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 05366527f44cf4b884f3d9462ae8009be9665856 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 7429b8b9bfbc276fd304fbaebc405f46b421fedf (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 9c2a6456bdf9794474460d885c359b6c4522d6e3 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 66bcb04a441fbf15d66834b7e3eefb313dd750c8 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < 539920180c55f5e13a2488a2339f94e6b8cb69e0 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < de89e58368f8f07df005ecc1c86ad94898a999f2 (git)
Affected: 4f738adba30a7cfc006f605707e7aee847ffefa0 , < a3967baad4d533dc254c31e0d221e51c8d223d58 (git)
Create a notification for this product.
    Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.153 , ≤ 6.1.* (semver)
Unaffected: 6.6.107 , ≤ 6.6.* (semver)
Unaffected: 6.12.48 , ≤ 6.12.* (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "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"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "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"
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          "url": "https://git.kernel.org/stable/c/a3967baad4d533dc254c31e0d221e51c8d223d58"
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      "title": "tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock-\u003ecork.",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39913",
    "datePublished": "2025-10-01T07:44:36.244Z",
    "dateReserved": "2025-04-16T07:20:57.147Z",
    "dateUpdated": "2025-11-03T17:44:36.959Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39913\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T08:15:34.390\",\"lastModified\":\"2025-11-03T18:16:52.710\",\"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\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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Tags
Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.