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CVE-2025-21852 (GCVE-0-2025-21852)

Vulnerability from cvelistv5 – Published: 2025-03-12 09:42 – Updated: 2026-05-11 21:07
VLAI
Title
net: Add rx_skb of kfree_skb to raw_tp_null_args[].
Summary
In the Linux kernel, the following vulnerability has been resolved: net: Add rx_skb of kfree_skb to raw_tp_null_args[]. Yan Zhai reported a BPF prog could trigger a null-ptr-deref [0] in trace_kfree_skb if the prog does not check if rx_sk is NULL. Commit c53795d48ee8 ("net: add rx_sk to trace_kfree_skb") added rx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL. Let's add kfree_skb to raw_tp_null_args[] to let the BPF verifier validate such a prog and prevent the issue. Now we fail to load such a prog: libbpf: prog 'drop': -- BEGIN PROG LOAD LOG -- 0: R1=ctx() R10=fp0 ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21 0: (79) r3 = *(u64 *)(r1 +24) func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock' 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1) ; bpf_printk("sk: %d, %d\n", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24 1: (69) r4 = *(u16 *)(r3 +16) R3 invalid mem access 'trusted_ptr_or_null_' processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 -- END PROG LOAD LOG -- Note this fix requires commit 838a10bd2ebf ("bpf: Augment raw_tp arguments with PTR_MAYBE_NULL"). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000010 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 PREEMPT SMP RIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d Call Trace: <TASK> ? __die+0x1f/0x60 ? page_fault_oops+0x148/0x420 ? search_bpf_extables+0x5b/0x70 ? fixup_exception+0x27/0x2c0 ? exc_page_fault+0x75/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d bpf_trace_run4+0x68/0xd0 ? unix_stream_connect+0x1f4/0x6f0 sk_skb_reason_drop+0x90/0x120 unix_stream_connect+0x1f4/0x6f0 __sys_connect+0x7f/0xb0 __x64_sys_connect+0x14/0x20 do_syscall_64+0x47/0xc30 entry_SYSCALL_64_after_hwframe+0x4b/0x53
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:26 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c53795d48ee8f385c6a9e394651e7ee914baaeba , < f579afacd0a66971fc8481f30d2d377e230a8342 (git)
Affected: c53795d48ee8f385c6a9e394651e7ee914baaeba , < 4dba79c1e7aad6620bbb707b6c4459380fd90860 (git)
Affected: c53795d48ee8f385c6a9e394651e7ee914baaeba , < 5da7e15fb5a12e78de974d8908f348e279922ce9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.17 , ≤ 6.12.* (semver)
Unaffected: 6.13.5 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\n\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\n\nCommit c53795d48ee8 (\"net: add rx_sk to trace_kfree_skb\") added\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\n\nLet\u0027s add kfree_skb to raw_tp_null_args[] to let the BPF verifier\nvalidate such a prog and prevent the issue.\n\nNow we fail to load such a prog:\n\n  libbpf: prog \u0027drop\u0027: -- BEGIN PROG LOAD LOG --\n  0: R1=ctx() R10=fp0\n  ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\n  0: (79) r3 = *(u64 *)(r1 +24)\n  func \u0027kfree_skb\u0027 arg3 has btf_id 5253 type STRUCT \u0027sock\u0027\n  1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\n  ; bpf_printk(\"sk: %d, %d\\n\", sk, sk-\u003e__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\n  1: (69) r4 = *(u16 *)(r3 +16)\n  R3 invalid mem access \u0027trusted_ptr_or_null_\u0027\n  processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n  -- END PROG LOAD LOG --\n\nNote this fix requires commit 838a10bd2ebf (\"bpf: Augment raw_tp\narguments with PTR_MAYBE_NULL\").\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000010\n PF: supervisor read access in kernel mode\n PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nPREEMPT SMP\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x1f/0x60\n ? page_fault_oops+0x148/0x420\n ? search_bpf_extables+0x5b/0x70\n ? fixup_exception+0x27/0x2c0\n ? exc_page_fault+0x75/0x170\n ? asm_exc_page_fault+0x22/0x30\n ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\n bpf_trace_run4+0x68/0xd0\n ? unix_stream_connect+0x1f4/0x6f0\n sk_skb_reason_drop+0x90/0x120\n unix_stream_connect+0x1f4/0x6f0\n __sys_connect+0x7f/0xb0\n __x64_sys_connect+0x14/0x20\n do_syscall_64+0x47/0xc30\n entry_SYSCALL_64_after_hwframe+0x4b/0x53"
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    "cveId": "CVE-2025-21852",
    "datePublished": "2025-03-12T09:42:07.175Z",
    "dateReserved": "2024-12-29T08:45:45.779Z",
    "dateUpdated": "2026-05-11T21:07:45.279Z",
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      "cve": "CVE-2025-21852",
      "date": "2026-09-16",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21852\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-12T10:15:17.927\",\"lastModified\":\"2026-06-17T08:44:26.773\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\\n\\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\\n\\nCommit c53795d48ee8 (\\\"net: add rx_sk to trace_kfree_skb\\\") added\\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\\n\\nLet\u0027s add kfree_skb to raw_tp_null_args[] to let the BPF verifier\\nvalidate such a prog and prevent the issue.\\n\\nNow we fail to load such a prog:\\n\\n  libbpf: prog \u0027drop\u0027: -- BEGIN PROG LOAD LOG --\\n  0: R1=ctx() R10=fp0\\n  ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\\n  0: (79) r3 = *(u64 *)(r1 +24)\\n  func \u0027kfree_skb\u0027 arg3 has btf_id 5253 type STRUCT \u0027sock\u0027\\n  1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\\n  ; bpf_printk(\\\"sk: %d, %d\\\\n\\\", sk, sk-\u003e__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\\n  1: (69) r4 = *(u16 *)(r3 +16)\\n  R3 invalid mem access \u0027trusted_ptr_or_null_\u0027\\n  processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\\n  -- END PROG LOAD LOG --\\n\\nNote this fix requires commit 838a10bd2ebf (\\\"bpf: Augment raw_tp\\narguments with PTR_MAYBE_NULL\\\").\\n\\n[0]:\\nBUG: kernel NULL pointer dereference, address: 0000000000000010\\n PF: supervisor read access in kernel mode\\n PF: error_code(0x0000) - not-present page\\nPGD 0 P4D 0\\nPREEMPT SMP\\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\\nCall Trace:\\n \u003cTASK\u003e\\n ? __die+0x1f/0x60\\n ? page_fault_oops+0x148/0x420\\n ? search_bpf_extables+0x5b/0x70\\n ? fixup_exception+0x27/0x2c0\\n ? exc_page_fault+0x75/0x170\\n ? asm_exc_page_fault+0x22/0x30\\n ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\\n bpf_trace_run4+0x68/0xd0\\n ? unix_stream_connect+0x1f4/0x6f0\\n sk_skb_reason_drop+0x90/0x120\\n unix_stream_connect+0x1f4/0x6f0\\n __sys_connect+0x7f/0xb0\\n __x64_sys_connect+0x14/0x20\\n do_syscall_64+0x47/0xc30\\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: Add rx_skb of kfree_skb to raw_tp_null_args[]. Yan Zhai reported a BPF prog could trigger a null-ptr-deref [0] in trace_kfree_skb if the prog does not check if rx_sk is NULL. Commit c53795d48ee8 (\\\"net: add rx_sk to trace_kfree_skb\\\") added rx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL. Let\u0027s add kfree_skb to raw_tp_null_args[] to let the BPF verifier validate such a prog and prevent the issue. Now we fail to load such a prog: libbpf: prog \u0027drop\u0027: -- BEGIN PROG LOAD LOG -- 0: R1=ctx() R10=fp0 ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21 0: (79) r3 = *(u64 *)(r1 +24) func \u0027kfree_skb\u0027 arg3 has btf_id 5253 type STRUCT \u0027sock\u0027 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1) ; bpf_printk(\\\"sk: %d, %d\\\\n\\\", sk, sk-\u0026gt;__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24 1: (69) r4 = *(u16 *)(r3 +16) R3 invalid mem access \u0027trusted_ptr_or_null_\u0027 processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 -- END PROG LOAD LOG -- Note this fix requires commit 838a10bd2ebf (\\\"bpf: Augment raw_tp arguments with PTR_MAYBE_NULL\\\"). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000010 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 PREEMPT SMP RIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d Call Trace:  ? __die+0x1f/0x60 ? page_fault_oops+0x148/0x420 ? search_bpf_extables+0x5b/0x70 ? fixup_exception+0x27/0x2c0 ? exc_page_fault+0x75/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d bpf_trace_run4+0x68/0xd0 ? unix_stream_connect+0x1f4/0x6f0 sk_skb_reason_drop+0x90/0x120 unix_stream_connect+0x1f4/0x6f0 __sys_connect+0x7f/0xb0 __x64_sys_connect+0x14/0x20 do_syscall_64+0x47/0xc30 entry_SYSCALL_64_after_hwframe+0x4b/0x53 \"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/btf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c53795d48ee8f385c6a9e394651e7ee914baaeba\",\"lessThan\":\"f579afacd0a66971fc8481f30d2d377e230a8342\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c53795d48ee8f385c6a9e394651e7ee914baaeba\",\"lessThan\":\"4dba79c1e7aad6620bbb707b6c4459380fd90860\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c53795d48ee8f385c6a9e394651e7ee914baaeba\",\"lessThan\":\"5da7e15fb5a12e78de974d8908f348e279922ce9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/btf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.17\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.5\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-10-01T19:26:08.323491Z\",\"id\":\"CVE-2025-21852\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.12.17\",\"matchCriteriaId\":\"8FC6C994-91D3-44C1-95E0-C930D07CFE85\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.5\",\"matchCriteriaId\":\"72E69ABB-9015-43A6-87E1-5150383CFFD9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"66619FB8-0AAF-4166-B2CF-67B24143261D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4dba79c1e7aad6620bbb707b6c4459380fd90860\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5da7e15fb5a12e78de974d8908f348e279922ce9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f579afacd0a66971fc8481f30d2d377e230a8342\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:03:47+00:00",
      "cve": "CVE-2025-21852",
      "id": "CVE-2025-21852",
      "initial_release_date": "2025-03-12T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: Add rx_skb of kfree_skb to raw_tp_null_args[].",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21852.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:04:23Z",
      "cve": "CVE-2025-21852",
      "id": "CVE-2025-21852",
      "initial_release_date": "2025-03-12T15:23:50Z",
      "product_status:known_affected": "67",
      "product_status:known_not_affected": "368",
      "product_status:recommended": "407",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21852",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21852.json",
      "version": "41"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"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\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21852\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:26:08.323491Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:58:20.350Z\"}}], \"cna\": {\"title\": \"net: Add rx_skb of kfree_skb to raw_tp_null_args[].\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c53795d48ee8f385c6a9e394651e7ee914baaeba\", \"lessThan\": \"f579afacd0a66971fc8481f30d2d377e230a8342\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c53795d48ee8f385c6a9e394651e7ee914baaeba\", \"lessThan\": \"4dba79c1e7aad6620bbb707b6c4459380fd90860\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c53795d48ee8f385c6a9e394651e7ee914baaeba\", \"lessThan\": \"5da7e15fb5a12e78de974d8908f348e279922ce9\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/btf.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.12.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/btf.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f579afacd0a66971fc8481f30d2d377e230a8342\"}, {\"url\": \"https://git.kernel.org/stable/c/4dba79c1e7aad6620bbb707b6c4459380fd90860\"}, {\"url\": \"https://git.kernel.org/stable/c/5da7e15fb5a12e78de974d8908f348e279922ce9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\\n\\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\\n\\nCommit c53795d48ee8 (\\\"net: add rx_sk to trace_kfree_skb\\\") added\\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\\n\\nLet\u0027s add kfree_skb to raw_tp_null_args[] to let the BPF verifier\\nvalidate such a prog and prevent the issue.\\n\\nNow we fail to load such a prog:\\n\\n  libbpf: prog \u0027drop\u0027: -- BEGIN PROG LOAD LOG --\\n  0: R1=ctx() R10=fp0\\n  ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\\n  0: (79) r3 = *(u64 *)(r1 +24)\\n  func \u0027kfree_skb\u0027 arg3 has btf_id 5253 type STRUCT \u0027sock\u0027\\n  1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\\n  ; bpf_printk(\\\"sk: %d, %d\\\\n\\\", sk, sk-\u003e__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\\n  1: (69) r4 = *(u16 *)(r3 +16)\\n  R3 invalid mem access \u0027trusted_ptr_or_null_\u0027\\n  processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\\n  -- END PROG LOAD LOG --\\n\\nNote this fix requires commit 838a10bd2ebf (\\\"bpf: Augment raw_tp\\narguments with PTR_MAYBE_NULL\\\").\\n\\n[0]:\\nBUG: kernel NULL pointer dereference, address: 0000000000000010\\n PF: supervisor read access in kernel mode\\n PF: error_code(0x0000) - not-present page\\nPGD 0 P4D 0\\nPREEMPT SMP\\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\\nCall Trace:\\n \u003cTASK\u003e\\n ? __die+0x1f/0x60\\n ? page_fault_oops+0x148/0x420\\n ? search_bpf_extables+0x5b/0x70\\n ? fixup_exception+0x27/0x2c0\\n ? exc_page_fault+0x75/0x170\\n ? asm_exc_page_fault+0x22/0x30\\n ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\\n bpf_trace_run4+0x68/0xd0\\n ? unix_stream_connect+0x1f4/0x6f0\\n sk_skb_reason_drop+0x90/0x120\\n unix_stream_connect+0x1f4/0x6f0\\n __sys_connect+0x7f/0xb0\\n __x64_sys_connect+0x14/0x20\\n do_syscall_64+0x47/0xc30\\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.17\", \"versionStartIncluding\": \"6.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.5\", \"versionStartIncluding\": \"6.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"6.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:07:45.279Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21852\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T21:07:45.279Z\", \"dateReserved\": \"2024-12-29T08:45:45.779Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-12T09:42:07.175Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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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.


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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.