CVE-2025-38185 (GCVE-0-2025-38185)
Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-05-11 21:22
VLAI
EPSS
VEX
Title
atm: atmtcp: Free invalid length skb in atmtcp_c_send().
Summary
In the Linux kernel, the following vulnerability has been resolved:
atm: atmtcp: Free invalid length skb in atmtcp_c_send().
syzbot reported the splat below. [0]
vcc_sendmsg() copies data passed from userspace to skb and passes
it to vcc->dev->ops->send().
atmtcp_c_send() accesses skb->data as struct atmtcp_hdr after
checking if skb->len is 0, but it's not enough.
Also, when skb->len == 0, skb and sk (vcc) were leaked because
dev_kfree_skb() is not called and sk_wmem_alloc adjustment is missing
to revert atm_account_tx() in vcc_sendmsg(), which is expected
to be done in atm_pop_raw().
Let's properly free skb with an invalid length in atmtcp_c_send().
[0]:
BUG: KMSAN: uninit-value in atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294
atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294
vcc_sendmsg+0xd7c/0xff0 net/atm/common.c:644
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x330/0x3d0 net/socket.c:727
____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566
___sys_sendmsg+0x271/0x3b0 net/socket.c:2620
__sys_sendmsg net/socket.c:2652 [inline]
__do_sys_sendmsg net/socket.c:2657 [inline]
__se_sys_sendmsg net/socket.c:2655 [inline]
__x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655
x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4154 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579
__alloc_skb+0x347/0x7d0 net/core/skbuff.c:670
alloc_skb include/linux/skbuff.h:1336 [inline]
vcc_sendmsg+0xb40/0xff0 net/atm/common.c:628
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x330/0x3d0 net/socket.c:727
____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566
___sys_sendmsg+0x271/0x3b0 net/socket.c:2620
__sys_sendmsg net/socket.c:2652 [inline]
__do_sys_sendmsg net/socket.c:2657 [inline]
__se_sys_sendmsg net/socket.c:2655 [inline]
__x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655
x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 5798 Comm: syz-executor192 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Severity
5.5 (Medium)
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c19c0943424b412a84fdf178e6c71fe5480e4f0f
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4b0fd8c25a7583f8564af6cc910418fb8954e89 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1b0ad18704913c92a3ad53748fbc0f219a75b876 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ca00f0e6d733ecd9150716d1fd0138d26e674706 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3261c017a7c5d2815c6a388c5a3280d1fba0e8db (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e996507f59610e5752b8702537f13f551e7a2c96 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c9260c837de1d2b454960a4a2e44a81272fbcd22 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2f370ae1fb6317985f3497b1bb80d457508ca2f7 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.95 , ≤ 6.6.* (semver) Unaffected: 6.12.35 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: atmtcp: Free invalid length skb in atmtcp_c_send().\n\nsyzbot reported the splat below. [0]\n\nvcc_sendmsg() copies data passed from userspace to skb and passes\nit to vcc-\u003edev-\u003eops-\u003esend().\n\natmtcp_c_send() accesses skb-\u003edata as struct atmtcp_hdr after\nchecking if skb-\u003elen is 0, but it\u0027s not enough.\n\nAlso, when skb-\u003elen == 0, skb and sk (vcc) were leaked because\ndev_kfree_skb() is not called and sk_wmem_alloc adjustment is missing\nto revert atm_account_tx() in vcc_sendmsg(), which is expected\nto be done in atm_pop_raw().\n\nLet\u0027s properly free skb with an invalid length in atmtcp_c_send().\n\n[0]:\nBUG: KMSAN: uninit-value in atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294\n atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294\n vcc_sendmsg+0xd7c/0xff0 net/atm/common.c:644\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n __sys_sendmsg net/socket.c:2652 [inline]\n __do_sys_sendmsg net/socket.c:2657 [inline]\n __se_sys_sendmsg net/socket.c:2655 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655\n x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4154 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249\n kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579\n __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670\n alloc_skb include/linux/skbuff.h:1336 [inline]\n vcc_sendmsg+0xb40/0xff0 net/atm/common.c:628\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n __sys_sendmsg net/socket.c:2652 [inline]\n __do_sys_sendmsg net/socket.c:2657 [inline]\n __se_sys_sendmsg net/socket.c:2655 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655\n x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 1 UID: 0 PID: 5798 Comm: syz-executor192 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(undef)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025"
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{
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{
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: atmtcp: Free invalid length skb in atmtcp_c_send().\n\nsyzbot reported the splat below. [0]\n\nvcc_sendmsg() copies data passed from userspace to skb and passes\nit to vcc-\u003edev-\u003eops-\u003esend().\n\natmtcp_c_send() accesses skb-\u003edata as struct atmtcp_hdr after\nchecking if skb-\u003elen is 0, but it\u0027s not enough.\n\nAlso, when skb-\u003elen == 0, skb and sk (vcc) were leaked because\ndev_kfree_skb() is not called and sk_wmem_alloc adjustment is missing\nto revert atm_account_tx() in vcc_sendmsg(), which is expected\nto be done in atm_pop_raw().\n\nLet\u0027s properly free skb with an invalid length in atmtcp_c_send().\n\n[0]:\nBUG: KMSAN: uninit-value in atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294\n atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294\n vcc_sendmsg+0xd7c/0xff0 net/atm/common.c:644\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n __sys_sendmsg net/socket.c:2652 [inline]\n __do_sys_sendmsg net/socket.c:2657 [inline]\n __se_sys_sendmsg net/socket.c:2655 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655\n x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4154 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249\n kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579\n __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670\n alloc_skb include/linux/skbuff.h:1336 [inline]\n vcc_sendmsg+0xb40/0xff0 net/atm/common.c:628\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n __sys_sendmsg net/socket.c:2652 [inline]\n __do_sys_sendmsg net/socket.c:2657 [inline]\n __se_sys_sendmsg net/socket.c:2655 [inline]\n __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655\n x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 1 UID: 0 PID: 5798 Comm: syz-executor192 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(undef)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: atm: atmtcp: Free invalid length skb in atmtcp_c_send(). syzbot report\u00f3 el splat a continuaci\u00f3n. [0] vcc_sendmsg() copia los datos pasados del espacio de usuario a skb y los pasa a vcc-\u0026gt;dev-\u0026gt;ops-\u0026gt;send(). atmtcp_c_send() accede a skb-\u0026gt;data como struct atmtcp_hdr despu\u00e9s de verificar si skb-\u0026gt;len es 0, pero no es suficiente. Adem\u00e1s, cuando skb-\u0026gt;len == 0, skb y sk (vcc) se filtraron porque no se llama a dev_kfree_skb() y falta el ajuste sk_wmem_alloc para revertir atm_account_tx() en vcc_sendmsg(), lo que se espera que se haga en atm_pop_raw(). Liberemos adecuadamente skb con una longitud no v\u00e1lida en atmtcp_c_send(). [0]: ERROR: KMSAN: uninit-value in atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294 atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294 vcc_sendmsg+0xd7c/0xff0 net/atm/common.c:644 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655 x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1336 [inline] vcc_sendmsg+0xb40/0xff0 net/atm/common.c:628 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655 x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 5798 Comm: syz-executor192 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 "
}
],
"id": "CVE-2025-38185",
"lastModified": "2026-06-17T09:16:20.713",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-07-04T14:15:25.377",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1b0ad18704913c92a3ad53748fbc0f219a75b876"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/2f370ae1fb6317985f3497b1bb80d457508ca2f7"
},
{
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/3261c017a7c5d2815c6a388c5a3280d1fba0e8db"
},
{
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/a4b0fd8c25a7583f8564af6cc910418fb8954e89"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c19c0943424b412a84fdf178e6c71fe5480e4f0f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c9260c837de1d2b454960a4a2e44a81272fbcd22"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ca00f0e6d733ecd9150716d1fd0138d26e674706"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/e996507f59610e5752b8702537f13f551e7a2c96"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-401"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T00:55:41+00:00",
"cve": "CVE-2025-38185",
"id": "CVE-2025-38185",
"initial_release_date": "2025-07-04T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: atm: atmtcp: Free invalid length skb in atmtcp_c_send()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38185.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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