CVE-2025-68776 (GCVE-0-2025-68776)
Vulnerability from cvelistv5 – Published: 2026-01-13 15:28 – Updated: 2026-01-13 15:28
VLAI?
Title
net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()
prp_get_untagged_frame() calls __pskb_copy() to create frame->skb_std
but doesn't check if the allocation failed. If __pskb_copy() returns
NULL, skb_clone() is called with a NULL pointer, causing a crash:
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]
CPU: 0 UID: 0 PID: 5625 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:skb_clone+0xd7/0x3a0 net/core/skbuff.c:2041
Code: 03 42 80 3c 20 00 74 08 4c 89 f7 e8 23 29 05 f9 49 83 3e 00 0f 85 a0 01 00 00 e8 94 dd 9d f8 48 8d 6b 7e 49 89 ee 49 c1 ee 03 <43> 0f b6 04 26 84 c0 0f 85 d1 01 00 00 44 0f b6 7d 00 41 83 e7 0c
RSP: 0018:ffffc9000d00f200 EFLAGS: 00010207
RAX: ffffffff892235a1 RBX: 0000000000000000 RCX: ffff88803372a480
RDX: 0000000000000000 RSI: 0000000000000820 RDI: 0000000000000000
RBP: 000000000000007e R08: ffffffff8f7d0f77 R09: 1ffffffff1efa1ee
R10: dffffc0000000000 R11: fffffbfff1efa1ef R12: dffffc0000000000
R13: 0000000000000820 R14: 000000000000000f R15: ffff88805144cc00
FS: 0000555557f6d500(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555581d35808 CR3: 000000005040e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]
hsr_forward_skb+0x1013/0x2860 net/hsr/hsr_forward.c:741
hsr_handle_frame+0x6ce/0xa70 net/hsr/hsr_slave.c:84
__netif_receive_skb_core+0x10b9/0x4380 net/core/dev.c:5966
__netif_receive_skb_one_core net/core/dev.c:6077 [inline]
__netif_receive_skb+0x72/0x380 net/core/dev.c:6192
netif_receive_skb_internal net/core/dev.c:6278 [inline]
netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337
tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953
tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
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/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0449f8e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007ffd7ad94c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f044a1e5fa0 RCX: 00007f0449f8e1ff
RDX: 000000000000003e RSI: 0000200000000500 RDI: 00000000000000c8
RBP: 00007ffd7ad94d20 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003e R11: 0000000000000293 R12: 0000000000000001
R13: 00007f044a1e5fa0 R14: 00007f044a1e5fa0 R15: 0000000000000003
</TASK>
Add a NULL check immediately after __pskb_copy() to handle allocation
failures gracefully.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
f266a683a4804dc499efc6c2206ef68efed029d0 , < 7be6d25f4d974e44918ba3a5d58ebb9d36879087
(git)
Affected: f266a683a4804dc499efc6c2206ef68efed029d0 , < 8f289fa12926aae44347ca7d490e216555d8f255 (git) Affected: f266a683a4804dc499efc6c2206ef68efed029d0 , < 1742974c24a9c1f1fd2e5edca0cbaccb720b397a (git) Affected: f266a683a4804dc499efc6c2206ef68efed029d0 , < 6220d38a08f8837575cd8f830928b49a3a5a5095 (git) Affected: f266a683a4804dc499efc6c2206ef68efed029d0 , < 188e0fa5a679570ea35474575e724d8211423d17 (git) |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/hsr/hsr_forward.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7be6d25f4d974e44918ba3a5d58ebb9d36879087",
"status": "affected",
"version": "f266a683a4804dc499efc6c2206ef68efed029d0",
"versionType": "git"
},
{
"lessThan": "8f289fa12926aae44347ca7d490e216555d8f255",
"status": "affected",
"version": "f266a683a4804dc499efc6c2206ef68efed029d0",
"versionType": "git"
},
{
"lessThan": "1742974c24a9c1f1fd2e5edca0cbaccb720b397a",
"status": "affected",
"version": "f266a683a4804dc499efc6c2206ef68efed029d0",
"versionType": "git"
},
{
"lessThan": "6220d38a08f8837575cd8f830928b49a3a5a5095",
"status": "affected",
"version": "f266a683a4804dc499efc6c2206ef68efed029d0",
"versionType": "git"
},
{
"lessThan": "188e0fa5a679570ea35474575e724d8211423d17",
"status": "affected",
"version": "f266a683a4804dc499efc6c2206ef68efed029d0",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/hsr/hsr_forward.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.17"
},
{
"lessThan": "3.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.120",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.160",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.120",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.64",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.3",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19-rc2",
"versionStartIncluding": "3.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/hsr: fix NULL pointer dereference in prp_get_untagged_frame()\n\nprp_get_untagged_frame() calls __pskb_copy() to create frame-\u003eskb_std\nbut doesn\u0027t check if the allocation failed. If __pskb_copy() returns\nNULL, skb_clone() is called with a NULL pointer, causing a crash:\n\nOops: general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]\nCPU: 0 UID: 0 PID: 5625 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:skb_clone+0xd7/0x3a0 net/core/skbuff.c:2041\nCode: 03 42 80 3c 20 00 74 08 4c 89 f7 e8 23 29 05 f9 49 83 3e 00 0f 85 a0 01 00 00 e8 94 dd 9d f8 48 8d 6b 7e 49 89 ee 49 c1 ee 03 \u003c43\u003e 0f b6 04 26 84 c0 0f 85 d1 01 00 00 44 0f b6 7d 00 41 83 e7 0c\nRSP: 0018:ffffc9000d00f200 EFLAGS: 00010207\nRAX: ffffffff892235a1 RBX: 0000000000000000 RCX: ffff88803372a480\nRDX: 0000000000000000 RSI: 0000000000000820 RDI: 0000000000000000\nRBP: 000000000000007e R08: ffffffff8f7d0f77 R09: 1ffffffff1efa1ee\nR10: dffffc0000000000 R11: fffffbfff1efa1ef R12: dffffc0000000000\nR13: 0000000000000820 R14: 000000000000000f R15: ffff88805144cc00\nFS: 0000555557f6d500(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000555581d35808 CR3: 000000005040e000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]\n hsr_forward_skb+0x1013/0x2860 net/hsr/hsr_forward.c:741\n hsr_handle_frame+0x6ce/0xa70 net/hsr/hsr_slave.c:84\n __netif_receive_skb_core+0x10b9/0x4380 net/core/dev.c:5966\n __netif_receive_skb_one_core net/core/dev.c:6077 [inline]\n __netif_receive_skb+0x72/0x380 net/core/dev.c:6192\n netif_receive_skb_internal net/core/dev.c:6278 [inline]\n netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337\n tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485\n tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953\n tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999\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/0xfa0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f0449f8e1ff\nCode: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48\nRSP: 002b:00007ffd7ad94c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 00007f044a1e5fa0 RCX: 00007f0449f8e1ff\nRDX: 000000000000003e RSI: 0000200000000500 RDI: 00000000000000c8\nRBP: 00007ffd7ad94d20 R08: 0000000000000000 R09: 0000000000000000\nR10: 000000000000003e R11: 0000000000000293 R12: 0000000000000001\nR13: 00007f044a1e5fa0 R14: 00007f044a1e5fa0 R15: 0000000000000003\n \u003c/TASK\u003e\n\nAdd a NULL check immediately after __pskb_copy() to handle allocation\nfailures gracefully."
}
],
"providerMetadata": {
"dateUpdated": "2026-01-13T15:28:52.766Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7be6d25f4d974e44918ba3a5d58ebb9d36879087"
},
{
"url": "https://git.kernel.org/stable/c/8f289fa12926aae44347ca7d490e216555d8f255"
},
{
"url": "https://git.kernel.org/stable/c/1742974c24a9c1f1fd2e5edca0cbaccb720b397a"
},
{
"url": "https://git.kernel.org/stable/c/6220d38a08f8837575cd8f830928b49a3a5a5095"
},
{
"url": "https://git.kernel.org/stable/c/188e0fa5a679570ea35474575e724d8211423d17"
}
],
"title": "net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-68776",
"datePublished": "2026-01-13T15:28:52.766Z",
"dateReserved": "2025-12-24T10:30:51.035Z",
"dateUpdated": "2026-01-13T15:28:52.766Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-68776\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:15:57.193\",\"lastModified\":\"2026-01-13T16:15:57.193\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/hsr: fix NULL pointer dereference in prp_get_untagged_frame()\\n\\nprp_get_untagged_frame() calls __pskb_copy() to create frame-\u003eskb_std\\nbut doesn\u0027t check if the allocation failed. If __pskb_copy() returns\\nNULL, skb_clone() is called with a NULL pointer, causing a crash:\\n\\nOops: general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] SMP KASAN NOPTI\\nKASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]\\nCPU: 0 UID: 0 PID: 5625 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nRIP: 0010:skb_clone+0xd7/0x3a0 net/core/skbuff.c:2041\\nCode: 03 42 80 3c 20 00 74 08 4c 89 f7 e8 23 29 05 f9 49 83 3e 00 0f 85 a0 01 00 00 e8 94 dd 9d f8 48 8d 6b 7e 49 89 ee 49 c1 ee 03 \u003c43\u003e 0f b6 04 26 84 c0 0f 85 d1 01 00 00 44 0f b6 7d 00 41 83 e7 0c\\nRSP: 0018:ffffc9000d00f200 EFLAGS: 00010207\\nRAX: ffffffff892235a1 RBX: 0000000000000000 RCX: ffff88803372a480\\nRDX: 0000000000000000 RSI: 0000000000000820 RDI: 0000000000000000\\nRBP: 000000000000007e R08: ffffffff8f7d0f77 R09: 1ffffffff1efa1ee\\nR10: dffffc0000000000 R11: fffffbfff1efa1ef R12: dffffc0000000000\\nR13: 0000000000000820 R14: 000000000000000f R15: ffff88805144cc00\\nFS: 0000555557f6d500(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000\\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000555581d35808 CR3: 000000005040e000 CR4: 0000000000352ef0\\nCall Trace:\\n \u003cTASK\u003e\\n hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]\\n hsr_forward_skb+0x1013/0x2860 net/hsr/hsr_forward.c:741\\n hsr_handle_frame+0x6ce/0xa70 net/hsr/hsr_slave.c:84\\n __netif_receive_skb_core+0x10b9/0x4380 net/core/dev.c:5966\\n __netif_receive_skb_one_core net/core/dev.c:6077 [inline]\\n __netif_receive_skb+0x72/0x380 net/core/dev.c:6192\\n netif_receive_skb_internal net/core/dev.c:6278 [inline]\\n netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337\\n tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485\\n tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953\\n tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999\\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/0xfa0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f0449f8e1ff\\nCode: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48\\nRSP: 002b:00007ffd7ad94c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\\nRAX: ffffffffffffffda RBX: 00007f044a1e5fa0 RCX: 00007f0449f8e1ff\\nRDX: 000000000000003e RSI: 0000200000000500 RDI: 00000000000000c8\\nRBP: 00007ffd7ad94d20 R08: 0000000000000000 R09: 0000000000000000\\nR10: 000000000000003e R11: 0000000000000293 R12: 0000000000000001\\nR13: 00007f044a1e5fa0 R14: 00007f044a1e5fa0 R15: 0000000000000003\\n \u003c/TASK\u003e\\n\\nAdd a NULL check immediately after __pskb_copy() to handle allocation\\nfailures gracefully.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1742974c24a9c1f1fd2e5edca0cbaccb720b397a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/188e0fa5a679570ea35474575e724d8211423d17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6220d38a08f8837575cd8f830928b49a3a5a5095\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7be6d25f4d974e44918ba3a5d58ebb9d36879087\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f289fa12926aae44347ca7d490e216555d8f255\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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