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alsa-2025:23279
Vulnerability from osv_almalinux
Published
2025-12-16 00:00
Modified
2026-01-05 20:25
Summary
Important: kernel security update
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
- kernel: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns (CVE-2025-38499)
- kernel: net: tun: Update napi->skb after XDP process (CVE-2025-39984)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
{
"affected": [
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "kernel-abi-stablelists"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.12.0-124.21.1.el10_1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "kernel-doc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.12.0-124.21.1.el10_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"details": "The kernel packages contain the Linux kernel, the core of any Linux operating system. \n\nSecurity Fix(es): \n\n * kernel: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns (CVE-2025-38499)\n * kernel: net: tun: Update napi-\u003eskb after XDP process (CVE-2025-39984)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
"id": "ALSA-2025:23279",
"modified": "2026-01-05T20:25:15Z",
"published": "2025-12-16T00:00:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://access.redhat.com/errata/RHSA-2025:23279"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2025-38499"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2025-39984"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2387670"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2404111"
},
{
"type": "ADVISORY",
"url": "https://errata.almalinux.org/10/ALSA-2025-23279.html"
}
],
"related": [
"CVE-2025-38499",
"CVE-2025-39984"
],
"summary": "Important: kernel security update"
}
CVE-2025-38499 (GCVE-0-2025-38499)
Vulnerability from cvelistv5 – Published: 2025-08-11 16:01 – Updated: 2026-05-23 15:59
VLAI
EPSS
Title
clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns
Summary
In the Linux kernel, the following vulnerability has been resolved:
clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns
What we want is to verify there is that clone won't expose something
hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo"
may be a result of MNT_LOCKED on a child, but it may also come from
lacking admin rights in the userns of the namespace mount belongs to.
clone_private_mnt() checks the former, but not the latter.
There's a number of rather confusing CAP_SYS_ADMIN checks in various
userns during the mount, especially with the new mount API; they serve
different purposes and in case of clone_private_mnt() they usually,
but not always end up covering the missing check mentioned above.
Severity
No CVSS data available.
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://git.kernel.org/stable/c/36fecd740de2d542d… | |
| https://git.kernel.org/stable/c/d717325b5ecf2a40d… | |
| https://git.kernel.org/stable/c/dc6a664089f10eab0… | |
| https://git.kernel.org/stable/c/e77078e52fbf018ab… | |
| https://git.kernel.org/stable/c/38628ae06e2a37770… | |
| https://git.kernel.org/stable/c/c28f922c9dcee0e48… |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
427215d85e8d1476da1a86b8d67aceb485eb3631 , < 36fecd740de2d542d2091d65d36554ee2bcf9c65
(git)
Affected: 427215d85e8d1476da1a86b8d67aceb485eb3631 , < d717325b5ecf2a40daca85c61923e17f32306179 (git) Affected: 427215d85e8d1476da1a86b8d67aceb485eb3631 , < dc6a664089f10eab0fb36b6e4f705022210191d2 (git) Affected: 427215d85e8d1476da1a86b8d67aceb485eb3631 , < e77078e52fbf018ab986efb3c79065ab35025607 (git) Affected: 427215d85e8d1476da1a86b8d67aceb485eb3631 , < 38628ae06e2a37770cd794802a3f1310cf9846e3 (git) Affected: 427215d85e8d1476da1a86b8d67aceb485eb3631 , < c28f922c9dcee0e4876a2c095939d77fe7e15116 (git) Affected: c6e8810d25295acb40a7b69ed3962ff181919571 (git) Affected: e3eee87c846dc47f6d8eb6d85e7271f24122a279 (git) Affected: 517b875dfbf58f0c6c9e32dc90f5cf42d71a42ce (git) Affected: 963d85d630dabe75a3cfde44a006fec3304d07b8 (git) Affected: 812f39ed5b0b7f34868736de3055c92c7c4cf459 (git) Affected: 6a002d48a66076524f67098132538bef17e8445e (git) Affected: 41812f4b84484530057513478c6770590347dc30 (git) Affected: 4.4.281 , < 4.5 (semver) Affected: 4.9.280 , < 4.10 (semver) Affected: 4.14.244 , < 4.15 (semver) Affected: 4.19.204 , < 4.20 (semver) Affected: 5.4.141 , < 5.5 (semver) Affected: 5.10.59 , < 5.11 (semver) Affected: 5.13.11 , < 5.14 (semver) |
|
| Linux | Linux |
Affected:
5.14
Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.147 , ≤ 6.1.* (semver) Unaffected: 6.6.100 , ≤ 6.6.* (semver) Unaffected: 6.12.40 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
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CVE-2025-39984 (GCVE-0-2025-39984)
Vulnerability from cvelistv5 – Published: 2025-10-15 07:56 – Updated: 2026-05-11 21:40
VLAI
EPSS
Title
net: tun: Update napi->skb after XDP process
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: tun: Update napi->skb after XDP process
The syzbot report a UAF issue:
BUG: KASAN: slab-use-after-free in skb_reset_mac_header include/linux/skbuff.h:3150 [inline]
BUG: KASAN: slab-use-after-free in napi_frags_skb net/core/gro.c:723 [inline]
BUG: KASAN: slab-use-after-free in napi_gro_frags+0x6e/0x1030 net/core/gro.c:758
Read of size 8 at addr ffff88802ef22c18 by task syz.0.17/6079
CPU: 0 UID: 0 PID: 6079 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
skb_reset_mac_header include/linux/skbuff.h:3150 [inline]
napi_frags_skb net/core/gro.c:723 [inline]
napi_gro_frags+0x6e/0x1030 net/core/gro.c:758
tun_get_user+0x28cb/0x3e20 drivers/net/tun.c:1920
tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
Allocated by task 6079:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:330 [inline]
__kasan_mempool_unpoison_object+0xa0/0x170 mm/kasan/common.c:558
kasan_mempool_unpoison_object include/linux/kasan.h:388 [inline]
napi_skb_cache_get+0x37b/0x6d0 net/core/skbuff.c:295
__alloc_skb+0x11e/0x2d0 net/core/skbuff.c:657
napi_alloc_skb+0x84/0x7d0 net/core/skbuff.c:811
napi_get_frags+0x69/0x140 net/core/gro.c:673
tun_napi_alloc_frags drivers/net/tun.c:1404 [inline]
tun_get_user+0x77c/0x3e20 drivers/net/tun.c:1784
tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6079:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kmem_cache_free+0x18f/0x400 mm/slub.c:4797
skb_pp_cow_data+0xdd8/0x13e0 net/core/skbuff.c:969
netif_skb_check_for_xdp net/core/dev.c:5390 [inline]
netif_receive_generic_xdp net/core/dev.c:5431 [inline]
do_xdp_generic+0x699/0x11a0 net/core/dev.c:5499
tun_get_user+0x2523/0x3e20 drivers/net/tun.c:1872
tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
After commit e6d5dbdd20aa ("xdp: add multi-buff support for xdp running in
generic mode"), the original skb may be freed in skb_pp_cow_data() when
XDP program was attached, which was allocated in tun_napi_alloc_frags().
However, the napi->skb still point to the original skb, update it after
XDP process.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
e6d5dbdd20aa6a86974af51deb9414cd2e7794cb , < 953200d56fc23eebf80a5ad9eed6e2e8a3065093
(git)
Affected: e6d5dbdd20aa6a86974af51deb9414cd2e7794cb , < 1697577e1669b0321d02cd848384a5d33e284296 (git) Affected: e6d5dbdd20aa6a86974af51deb9414cd2e7794cb , < 1091860a16a86ccdd77c09f2b21a5f634f5ab9ec (git) |
|
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.50 , ≤ 6.12.* (semver) Unaffected: 6.16.10 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/tun.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "953200d56fc23eebf80a5ad9eed6e2e8a3065093",
"status": "affected",
"version": "e6d5dbdd20aa6a86974af51deb9414cd2e7794cb",
"versionType": "git"
},
{
"lessThan": "1697577e1669b0321d02cd848384a5d33e284296",
"status": "affected",
"version": "e6d5dbdd20aa6a86974af51deb9414cd2e7794cb",
"versionType": "git"
},
{
"lessThan": "1091860a16a86ccdd77c09f2b21a5f634f5ab9ec",
"status": "affected",
"version": "e6d5dbdd20aa6a86974af51deb9414cd2e7794cb",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/tun.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.10",
"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": "6.12.50",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.10",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Update napi-\u003eskb after XDP process\n\nThe syzbot report a UAF issue:\n\n BUG: KASAN: slab-use-after-free in skb_reset_mac_header include/linux/skbuff.h:3150 [inline]\n BUG: KASAN: slab-use-after-free in napi_frags_skb net/core/gro.c:723 [inline]\n BUG: KASAN: slab-use-after-free in napi_gro_frags+0x6e/0x1030 net/core/gro.c:758\n Read of size 8 at addr ffff88802ef22c18 by task syz.0.17/6079\n CPU: 0 UID: 0 PID: 6079 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n skb_reset_mac_header include/linux/skbuff.h:3150 [inline]\n napi_frags_skb net/core/gro.c:723 [inline]\n napi_gro_frags+0x6e/0x1030 net/core/gro.c:758\n tun_get_user+0x28cb/0x3e20 drivers/net/tun.c:1920\n tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x5c9/0xb30 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\n Allocated by task 6079:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:330 [inline]\n __kasan_mempool_unpoison_object+0xa0/0x170 mm/kasan/common.c:558\n kasan_mempool_unpoison_object include/linux/kasan.h:388 [inline]\n napi_skb_cache_get+0x37b/0x6d0 net/core/skbuff.c:295\n __alloc_skb+0x11e/0x2d0 net/core/skbuff.c:657\n napi_alloc_skb+0x84/0x7d0 net/core/skbuff.c:811\n napi_get_frags+0x69/0x140 net/core/gro.c:673\n tun_napi_alloc_frags drivers/net/tun.c:1404 [inline]\n tun_get_user+0x77c/0x3e20 drivers/net/tun.c:1784\n tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x5c9/0xb30 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Freed by task 6079:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:243 [inline]\n __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2422 [inline]\n slab_free mm/slub.c:4695 [inline]\n kmem_cache_free+0x18f/0x400 mm/slub.c:4797\n skb_pp_cow_data+0xdd8/0x13e0 net/core/skbuff.c:969\n netif_skb_check_for_xdp net/core/dev.c:5390 [inline]\n netif_receive_generic_xdp net/core/dev.c:5431 [inline]\n do_xdp_generic+0x699/0x11a0 net/core/dev.c:5499\n tun_get_user+0x2523/0x3e20 drivers/net/tun.c:1872\n tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x5c9/0xb30 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nAfter commit e6d5dbdd20aa (\"xdp: add multi-buff support for xdp running in\ngeneric mode\"), the original skb may be freed in skb_pp_cow_data() when\nXDP program was attached, which was allocated in tun_napi_alloc_frags().\nHowever, the napi-\u003eskb still point to the original skb, update it after\nXDP process."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:40:13.408Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/953200d56fc23eebf80a5ad9eed6e2e8a3065093"
},
{
"url": "https://git.kernel.org/stable/c/1697577e1669b0321d02cd848384a5d33e284296"
},
{
"url": "https://git.kernel.org/stable/c/1091860a16a86ccdd77c09f2b21a5f634f5ab9ec"
}
],
"title": "net: tun: Update napi-\u003eskb after XDP process",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39984",
"datePublished": "2025-10-15T07:56:03.438Z",
"dateReserved": "2025-04-16T07:20:57.150Z",
"dateUpdated": "2026-05-11T21:40:13.408Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
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(linear fit over daily sighting counts)
Show additional events:
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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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