{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38165", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.991Z", "datePublished": "2025-07-03T08:36:05.738Z", "dateUpdated": "2026-08-05T11:59:58.694Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:58.694Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix panic when calling skb_linearize\n\nThe panic can be reproduced by executing the command:\n./bench sockmap -c 2 -p 1 -a --rx-verdict-ingress --rx-strp 100000\n\nThen a kernel panic was captured:\n'''\n[ 657.460555] kernel BUG at net/core/skbuff.c:2178!\n[ 657.462680] Tainted: [W]=WARN\n[ 657.463287] Workqueue: events sk_psock_backlog\n...\n[ 657.469610] \n[ 657.469738] ? die+0x36/0x90\n[ 657.469916] ? do_trap+0x1d0/0x270\n[ 657.470118] ? pskb_expand_head+0x612/0xf40\n[ 657.470376] ? pskb_expand_head+0x612/0xf40\n[ 657.470620] ? do_error_trap+0xa3/0x170\n[ 657.470846] ? pskb_expand_head+0x612/0xf40\n[ 657.471092] ? handle_invalid_op+0x2c/0x40\n[ 657.471335] ? pskb_expand_head+0x612/0xf40\n[ 657.471579] ? exc_invalid_op+0x2d/0x40\n[ 657.471805] ? asm_exc_invalid_op+0x1a/0x20\n[ 657.472052] ? pskb_expand_head+0xd1/0xf40\n[ 657.472292] ? pskb_expand_head+0x612/0xf40\n[ 657.472540] ? lock_acquire+0x18f/0x4e0\n[ 657.472766] ? find_held_lock+0x2d/0x110\n[ 657.472999] ? __pfx_pskb_expand_head+0x10/0x10\n[ 657.473263] ? __kmalloc_cache_noprof+0x5b/0x470\n[ 657.473537] ? __pfx___lock_release.isra.0+0x10/0x10\n[ 657.473826] __pskb_pull_tail+0xfd/0x1d20\n[ 657.474062] ? __kasan_slab_alloc+0x4e/0x90\n[ 657.474707] sk_psock_skb_ingress_enqueue+0x3bf/0x510\n[ 657.475392] ? __kasan_kmalloc+0xaa/0xb0\n[ 657.476010] sk_psock_backlog+0x5cf/0xd70\n[ 657.476637] process_one_work+0x858/0x1a20\n'''\n\nThe panic originates from the assertion BUG_ON(skb_shared(skb)) in\nskb_linearize(). A previous commit(see Fixes tag) introduced skb_get()\nto avoid race conditions between skb operations in the backlog and skb\nrelease in the recvmsg path. However, this caused the panic to always\noccur when skb_linearize is executed.\n\nThe \"--rx-strp 100000\" parameter forces the RX path to use the strparser\nmodule which aggregates data until it reaches 100KB before calling sockmap\nlogic. The 100KB payload exceeds MAX_MSG_FRAGS, triggering skb_linearize.\n\nTo fix this issue, just move skb_get into sk_psock_skb_ingress_enqueue.\n\n'''\nsk_psock_backlog:\n sk_psock_handle_skb\n skb_get(skb) <== we move it into 'sk_psock_skb_ingress_enqueue'\n sk_psock_skb_ingress____________\n ↓\n |\n | → sk_psock_skb_ingress_self\n | sk_psock_skb_ingress_enqueue\nsk_psock_verdict_apply_________________↑ skb_linearize\n'''\n\nNote that for verdict_apply path, the skb_get operation is unnecessary so\nwe add 'take_ref' param to control it's behavior." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The crash is driven by data received from a remote TCP peer: `sk_psock_verdict_data_ready`/strparser process incoming segments in softirq and hand them to `sk_psock_backlog`, and the triggering condition (>18 scatter-gather entries from frags/frag_list) is a direct function of the volume and fragmentation of the attacker's stream, either via strparser message size or ordinary 64KB GRO frag_list chaining.\nAC:L - No race or memory-layout dependency is involved — `sk_psock_handle_skb()` unconditionally takes `skb_get()`, so `skb_shared()` is always true, and the commit author states the panic \"always occur[s] when skb_linearize is executed\"; the attacker only has to push a large enough message or burst, repeatably.\nPR:N - On the realistic deployment for this code (sockmap/sockhash-accelerated in-kernel proxies and service-mesh datapaths such as Cilium sockops using redirect-to-ingress), the attacker is an unauthenticated client that merely connects and sends data; no account, capability, or credential on the target is required, and the sockmap configuration is the victim's normal operating state, not something the attacker must set up.\nUI:N - The whole path runs automatically in the kernel receive path and the `sk_psock_backlog` workqueue as soon as data arrives; no administrator or local user action is needed.\nS:U - The BUG()/oops is confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The failure is a `BUG_ON(skb_shared(skb))` assertion that fires before any buffer is read or copied — there is no out-of-bounds read, no use-after-free, and no data returned to the attacker.\nI:N - The assertion aborts `pskb_expand_head()` before any memory is written, so no kernel data structure is corrupted and no write primitive is produced.\nA:H - A `BUG()` in `process_one_work` context kills the worker (a full panic with `panic_on_oops`, standard in cloud/hardened deployments) while `psock->work_mutex` is still held, leaving the sockmap backlog permanently deadlocked and hanging subsequent sockmap teardown — a remotely repeatable hard denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/skmsg.c" ], "versions": [ { "version": "65ad600b9bde68d2d28709943ab00b51ca8f0a1d", "lessThan": "4dba44333a11522df54b49aa1f2edfaf6ce35fc7", "status": "affected", "versionType": "git" }, { "version": "923877254f002ae87d441382bb1096d9e773d56d", "lessThan": "9718ba6490732dbe70190d42c21deb1440834402", "status": "affected", "versionType": "git" }, { "version": "a454d84ee20baf7bd7be90721b9821f73c7d23d9", "lessThan": "db1d15a26f21f97459508c42ae87cabe8d3afc3b", "status": "affected", "versionType": "git" }, { "version": "a454d84ee20baf7bd7be90721b9821f73c7d23d9", "lessThan": "3d25fa2d7f127348c818e1dab9e58534f7ac56cc", "status": "affected", "versionType": "git" }, { "version": "a454d84ee20baf7bd7be90721b9821f73c7d23d9", "lessThan": "e9c1299d813fc04668042690f2c3cc76d013959a", "status": "affected", "versionType": "git" }, { "version": "a454d84ee20baf7bd7be90721b9821f73c7d23d9", "lessThan": "5ca2e29f6834c64c0e5a9ccf1278c21fb49b827e", "status": "affected", "versionType": "git" }, { "version": "e6b5e47adb9166e732cdf7e6e034946e3f89f36d", "status": "affected", "versionType": "git" }, { "version": "5.15.189", "lessThan": "5.15.190", "status": "affected", "versionType": "semver" }, { "version": "6.1.54", "lessThan": "6.1.142", "status": "affected", "versionType": "semver" }, { "version": "6.5.4", "lessThan": "6.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/skmsg.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.94", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.189", "versionEndExcluding": "5.15.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.54", "versionEndExcluding": "6.1.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4dba44333a11522df54b49aa1f2edfaf6ce35fc7" }, { "url": "https://git.kernel.org/stable/c/9718ba6490732dbe70190d42c21deb1440834402" }, { "url": "https://git.kernel.org/stable/c/db1d15a26f21f97459508c42ae87cabe8d3afc3b" }, { "url": "https://git.kernel.org/stable/c/3d25fa2d7f127348c818e1dab9e58534f7ac56cc" }, { "url": "https://git.kernel.org/stable/c/e9c1299d813fc04668042690f2c3cc76d013959a" }, { "url": "https://git.kernel.org/stable/c/5ca2e29f6834c64c0e5a9ccf1278c21fb49b827e" } ], "title": "bpf, sockmap: Fix panic when calling skb_linearize", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:54.924Z" } } ] } }