326 lines
18 KiB
JSON
326 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-53354",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-09-16T16:08:59.567Z",
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"datePublished": "2025-09-17T14:56:44.388Z",
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"dateUpdated": "2026-08-05T09:13:37.623Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:13:37.623Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nskbuff: skb_segment, Call zero copy functions before using skbuff frags\n\nCommit bf5c25d60861 (\"skbuff: in skb_segment, call zerocopy functions\nonce per nskb\") added the call to zero copy functions in skb_segment().\nThe change introduced a bug in skb_segment() because skb_orphan_frags()\nmay possibly change the number of fragments or allocate new fragments\naltogether leaving nrfrags and frag to point to the old values. This can\ncause a panic with stacktrace like the one below.\n\n[ 193.894380] BUG: kernel NULL pointer dereference, address: 00000000000000bc\n[ 193.895273] CPU: 13 PID: 18164 Comm: vh-net-17428 Kdump: loaded Tainted: G O 5.15.123+ #26\n[ 193.903919] RIP: 0010:skb_segment+0xb0e/0x12f0\n[ 194.021892] Call Trace:\n[ 194.027422] <TASK>\n[ 194.072861] tcp_gso_segment+0x107/0x540\n[ 194.082031] inet_gso_segment+0x15c/0x3d0\n[ 194.090783] skb_mac_gso_segment+0x9f/0x110\n[ 194.095016] __skb_gso_segment+0xc1/0x190\n[ 194.103131] netem_enqueue+0x290/0xb10 [sch_netem]\n[ 194.107071] dev_qdisc_enqueue+0x16/0x70\n[ 194.110884] __dev_queue_xmit+0x63b/0xb30\n[ 194.121670] bond_start_xmit+0x159/0x380 [bonding]\n[ 194.128506] dev_hard_start_xmit+0xc3/0x1e0\n[ 194.131787] __dev_queue_xmit+0x8a0/0xb30\n[ 194.138225] macvlan_start_xmit+0x4f/0x100 [macvlan]\n[ 194.141477] dev_hard_start_xmit+0xc3/0x1e0\n[ 194.144622] sch_direct_xmit+0xe3/0x280\n[ 194.147748] __dev_queue_xmit+0x54a/0xb30\n[ 194.154131] tap_get_user+0x2a8/0x9c0 [tap]\n[ 194.157358] tap_sendmsg+0x52/0x8e0 [tap]\n[ 194.167049] handle_tx_zerocopy+0x14e/0x4c0 [vhost_net]\n[ 194.173631] handle_tx+0xcd/0xe0 [vhost_net]\n[ 194.176959] vhost_worker+0x76/0xb0 [vhost]\n[ 194.183667] kthread+0x118/0x140\n[ 194.190358] ret_from_fork+0x1f/0x30\n[ 194.193670] </TASK>\n\nIn this case calling skb_orphan_frags() updated nr_frags leaving nrfrags\nlocal variable in skb_segment() stale. This resulted in the code hitting\ni >= nrfrags prematurely and trying to move to next frag_skb using\nlist_skb pointer, which was NULL, and caused kernel panic. Move the call\nto zero copy functions before using frags and nr_frags."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is only reachable on TX skbs with zerocopy user frags (MSG_ZEROCOPY or vhost_net handle_tx_zerocopy); received remote packets do not carry skb_zcopy state, so skb_orphan_frags() is a no-op and cannot trigger the stale-frag path.\nAC:L - An attacker controls SO_ZEROCOPY/MSG_ZEROCOPY iov layout (hence how skb_copy_ubufs() changes nr_frags) and can force software GSO via netem/tbf in an unprivileged user+net namespace or any non-TSO egress path, making the trigger reliable.\nPR:L - SO_ZEROCOPY has no capability check, and CAP_NET_ADMIN needed to attach netem or disable TSO is available via unprivileged user namespaces; no real init-namespace root is required.\nUI:N - The attacker triggers the bug entirely through their own socket sends and optional qdisc configuration; no victim interaction is required.\nS:U - Corruption and crash occur in host kernel skbuff/GSO state within the same kernel security authority; this is standard local kernel memory corruption, not a VM/IOMMU/sandbox boundary escape.\nC:H - When skb_copy_ubufs() reduces nr_frags, skb_segment continues with a stale larger nfrags and re-refs frag slots whose pages were already unreferenced, yielding a UAF that can disclose kernel memory.\nI:H - The same stale-frag UAF (and dangling frag pointer if skb_unclone relocates shinfo) is heap memory corruption exploitable for arbitrary write/control-flow hijacking per UAF scoring guidance.\nA:H - The reported impact is a kernel NULL pointer dereference panic in skb_segment, and the UAF paths also cause oops/panic-level denial of service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/skbuff.c"
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],
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"versions": [
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{
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"version": "bf5c25d608613eaf4dcdba5a9cac5b2afe67d635",
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"lessThan": "fcab3f661dbfd88e27ddbbe65368f3fa2d823175",
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"status": "affected",
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"lessThan": "d44403ec0676317b7f7edf2a035bb219fee3304e",
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"status": "affected",
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"lessThan": "d5790386595d06ea9decfd9ba5f1ea48cf09aa02",
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"status": "affected",
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"lessThan": "04c3eee4e13f60bf6f9a366ad39f88a01a57166e",
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"status": "affected",
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"version": "bf5c25d608613eaf4dcdba5a9cac5b2afe67d635",
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"lessThan": "f99006e840a4dbc8f5a34cecc6b5b26c73ef49bb",
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"status": "affected",
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{
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"version": "bf5c25d608613eaf4dcdba5a9cac5b2afe67d635",
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"lessThan": "6c26ed3c6abe86ddab0510529000b970b05c9b40",
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"status": "affected",
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"versionType": "git"
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{
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"version": "bf5c25d608613eaf4dcdba5a9cac5b2afe67d635",
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"lessThan": "2ea35288c83b3d501a88bc17f2df8f176b5cc96f",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/skbuff.c"
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],
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"versions": [
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{
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"version": "4.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.295",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.257",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.195",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.132",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.53",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.4.16",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5.3",
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"lessThanOrEqual": "6.5.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/fcab3f661dbfd88e27ddbbe65368f3fa2d823175"
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},
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{
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"url": "https://git.kernel.org/stable/c/d44403ec0676317b7f7edf2a035bb219fee3304e"
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},
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{
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"url": "https://git.kernel.org/stable/c/8836c266201c29a5acb4f582227686f47b65ad61"
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},
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{
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"url": "https://git.kernel.org/stable/c/d5790386595d06ea9decfd9ba5f1ea48cf09aa02"
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},
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{
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"url": "https://git.kernel.org/stable/c/04c3eee4e13f60bf6f9a366ad39f88a01a57166e"
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},
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{
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"url": "https://git.kernel.org/stable/c/f99006e840a4dbc8f5a34cecc6b5b26c73ef49bb"
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},
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{
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"url": "https://git.kernel.org/stable/c/6c26ed3c6abe86ddab0510529000b970b05c9b40"
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},
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{
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"url": "https://git.kernel.org/stable/c/2ea35288c83b3d501a88bc17f2df8f176b5cc96f"
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}
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],
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"title": "skbuff: skb_segment, Call zero copy functions before using skbuff frags",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-53354",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-01-14T18:42:19.915192Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-476",
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"description": "CWE-476 NULL Pointer Dereference"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-01-14T18:43:04.063Z"
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}
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}
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]
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}
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} |