CVE-2026-53111
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap
The bpf_lwt_xmit_push_encap helper needs to access skb_dst(skb)->dev to calculate the needed headroom:
But skb->_skb_refdst may not be initialized when the skb is set up by bpf_prog_test_run_skb function. Executing bpf_lwt_push_ip_encap function in this scenario will trigger null pointer dereference, causing a kernel crash as Yinhao reported:
Temporarily add the setting of skb->_skb_refdst before bpf_test_run to resolve the issue.
Detalles técnicos trazas, registros y código del informe original
err = skb_cow_head(skb, len + LL_RESERVED_SPACE(skb_dst(skb)->dev)); [ 105.186365] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 105.186382] #PF: supervisor read access in kernel mode [ 105.186388] #PF: error_code(0x0000) - not-present page [ 105.186393] PGD 121d3d067 P4D 121d3d067 PUD 106c83067 PMD 0 [ 105.186404] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 105.186412] CPU: 3 PID: 3250 Comm: poc Kdump: loaded Not tainted 6.19.0-rc5 #1 [ 105.186423] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 105.186427] RIP: 0010:bpf_lwt_push_ip_encap+0x1eb/0x520 [ 105.186443] Code: 0f 84 de 01 00 00 0f b7 4a 04 66 85 c9 0f 85 47 01 00 00 31 c0 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 48 8b 73 58 48 83 e6 fe <48> 8b 36 0f b7 be ec 00 00 00 0f b7 b6 e6 00 00 00 01 fe 83 e6 f0 [ 105.186449] RSP: 0018:ffffbb0e0387bc50 EFLAGS: 00010246 [ 105.186455] RAX: 000000000000004e RBX: ffff94c74e036500 RCX: ffff94c74874da00 [ 105.186460] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff94c74e036500 [ 105.186463] RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000 [ 105.186467] R10: ffffbb0e0387bd50 R11: 0000000000000000 R12: ffffbb0e0387bc98 [ 105.186471] R13: 0000000000000014 R14: 0000000000000000 R15: 0000000000000002 [ 105.186484] FS: 00007f166aa4d680(0000) GS:ffff94c8b7780000(0000) knlGS:0000000000000000 [ 105.186490] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 105.186494] CR2: 0000000000000000 CR3: 000000015eade001 CR4: 0000000000770ee0 [ 105.186499] PKRU: 55555554 [ 105.186502] Call Trace: [ 105.186507] <TASK> [ 105.186513] bpf_lwt_xmit_push_encap+0x2b/0x40 [ 105.186522] bpf_prog_a75eaad51e517912+0x41/0x49 [ 105.186536] ? kvm_clock_get_cycles+0x18/0x30 [ 105.186547] ? ktime_get+0x3c/0xa0 [ 105.186554] bpf_test_run+0x195/0x320 [ 105.186563] ? bpf_test_run+0x10f/0x320 [ 105.186579] bpf_prog_test_run_skb+0x2f5/0x4f0 [ 105.186590] __sys_bpf+0x69c/0xa40 [ 105.186603] __x64_sys_bpf+0x1e/0x30 [ 105.186611] do_syscall_64+0x59/0x110 [ 105.186620] entry_SYSCALL_64_after_hwframe+0x76/0xe0 [ 105.186649] RIP: 0033:0x7f166a97455d
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/5500913516e071dbe23e5a404c861dd2d82c9589
- https://git.kernel.org/stable/c/599905c3f10bb83e6e6881d5a7f5cea5df07dc23
- https://git.kernel.org/stable/c/5c8d1f91fc4898d79f29d79c1a6f7c2b3ee66fb0
- https://git.kernel.org/stable/c/94f95328b9070909b5b875c647b17a11d3d85567
- https://git.kernel.org/stable/c/972787479ee73006fddb5e59ab5c8e733810ff42
- https://git.kernel.org/stable/c/c7ad31fb948fdd4905263f4324160682c3fa7bc6
JSON original (NVD)
Mostrar
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"id": "CVE-2026-53111",
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"source": "nvd@nist.gov",
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"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
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"published": "2026-06-24T17:17:25.453",
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"description": [
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"value": "CWE-476"
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"descriptions": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap\n\nThe bpf_lwt_xmit_push_encap helper needs to access skb_dst(skb)->dev to\ncalculate the needed headroom:\n\n\terr = skb_cow_head(skb,\n\t\t\t len + LL_RESERVED_SPACE(skb_dst(skb)->dev));\n\nBut skb->_skb_refdst may not be initialized when the skb is set up by\nbpf_prog_test_run_skb function. Executing bpf_lwt_push_ip_encap function\nin this scenario will trigger null pointer dereference, causing a kernel\ncrash as Yinhao reported:\n\n[ 105.186365] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[ 105.186382] #PF: supervisor read access in kernel mode\n[ 105.186388] #PF: error_code(0x0000) - not-present page\n[ 105.186393] PGD 121d3d067 P4D 121d3d067 PUD 106c83067 PMD 0\n[ 105.186404] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 105.186412] CPU: 3 PID: 3250 Comm: poc Kdump: loaded Not tainted 6.19.0-rc5 #1\n[ 105.186423] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 105.186427] RIP: 0010:bpf_lwt_push_ip_encap+0x1eb/0x520\n[ 105.186443] Code: 0f 84 de 01 00 00 0f b7 4a 04 66 85 c9 0f 85 47 01 00 00 31 c0 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 48 8b 73 58 48 83 e6 fe <48> 8b 36 0f b7 be ec 00 00 00 0f b7 b6 e6 00 00 00 01 fe 83 e6 f0\n[ 105.186449] RSP: 0018:ffffbb0e0387bc50 EFLAGS: 00010246\n[ 105.186455] RAX: 000000000000004e RBX: ffff94c74e036500 RCX: ffff94c74874da00\n[ 105.186460] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff94c74e036500\n[ 105.186463] RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000\n[ 105.186467] R10: ffffbb0e0387bd50 R11: 0000000000000000 R12: ffffbb0e0387bc98\n[ 105.186471] R13: 0000000000000014 R14: 0000000000000000 R15: 0000000000000002\n[ 105.186484] FS: 00007f166aa4d680(0000) GS:ffff94c8b7780000(0000) knlGS:0000000000000000\n[ 105.186490] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 105.186494] CR2: 0000000000000000 CR3: 000000015eade001 CR4: 0000000000770ee0\n[ 105.186499] PKRU: 55555554\n[ 105.186502] Call Trace:\n[ 105.186507] <TASK>\n[ 105.186513] bpf_lwt_xmit_push_encap+0x2b/0x40\n[ 105.186522] bpf_prog_a75eaad51e517912+0x41/0x49\n[ 105.186536] ? kvm_clock_get_cycles+0x18/0x30\n[ 105.186547] ? ktime_get+0x3c/0xa0\n[ 105.186554] bpf_test_run+0x195/0x320\n[ 105.186563] ? bpf_test_run+0x10f/0x320\n[ 105.186579] bpf_prog_test_run_skb+0x2f5/0x4f0\n[ 105.186590] __sys_bpf+0x69c/0xa40\n[ 105.186603] __x64_sys_bpf+0x1e/0x30\n[ 105.186611] do_syscall_64+0x59/0x110\n[ 105.186620] entry_SYSCALL_64_after_hwframe+0x76/0xe0\n[ 105.186649] RIP: 0033:0x7f166a97455d\n\nTemporarily add the setting of skb->_skb_refdst before bpf_test_run to resolve the issue."
}
],
"lastModified": "2026-07-23T21:30:22.967",
"configurations": [
{
"nodes": [
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