CVE-2025-38468 (GCVE-0-2025-38468)
Vulnerability from cvelistv5 – Published: 2025-07-28 11:12 – Updated: 2026-07-14 12:42
VLAI
EPSS
VEX
Title
net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree
htb_lookup_leaf has a BUG_ON that can trigger with the following:
tc qdisc del dev lo root
tc qdisc add dev lo root handle 1: htb default 1
tc class add dev lo parent 1: classid 1:1 htb rate 64bit
tc qdisc add dev lo parent 1:1 handle 2: netem
tc qdisc add dev lo parent 2:1 handle 3: blackhole
ping -I lo -c1 -W0.001 127.0.0.1
The root cause is the following:
1. htb_dequeue calls htb_dequeue_tree which calls the dequeue handler on
the selected leaf qdisc
2. netem_dequeue calls enqueue on the child qdisc
3. blackhole_enqueue drops the packet and returns a value that is not
just NET_XMIT_SUCCESS
4. Because of this, netem_dequeue calls qdisc_tree_reduce_backlog, and
since qlen is now 0, it calls htb_qlen_notify -> htb_deactivate ->
htb_deactiviate_prios -> htb_remove_class_from_row -> htb_safe_rb_erase
5. As this is the only class in the selected hprio rbtree,
__rb_change_child in __rb_erase_augmented sets the rb_root pointer to
NULL
6. Because blackhole_dequeue returns NULL, netem_dequeue returns NULL,
which causes htb_dequeue_tree to call htb_lookup_leaf with the same
hprio rbtree, and fail the BUG_ON
The function graph for this scenario is shown here:
0) | htb_enqueue() {
0) + 13.635 us | netem_enqueue();
0) 4.719 us | htb_activate_prios();
0) # 2249.199 us | }
0) | htb_dequeue() {
0) 2.355 us | htb_lookup_leaf();
0) | netem_dequeue() {
0) + 11.061 us | blackhole_enqueue();
0) | qdisc_tree_reduce_backlog() {
0) | qdisc_lookup_rcu() {
0) 1.873 us | qdisc_match_from_root();
0) 6.292 us | }
0) 1.894 us | htb_search();
0) | htb_qlen_notify() {
0) 2.655 us | htb_deactivate_prios();
0) 6.933 us | }
0) + 25.227 us | }
0) 1.983 us | blackhole_dequeue();
0) + 86.553 us | }
0) # 2932.761 us | qdisc_warn_nonwc();
0) | htb_lookup_leaf() {
0) | BUG_ON();
------------------------------------------
The full original bug report can be seen here [1].
We can fix this just by returning NULL instead of the BUG_ON,
as htb_dequeue_tree returns NULL when htb_lookup_leaf returns
NULL.
[1] https://lore.kernel.org/netdev/pF5XOOIim0IuEfhI-SOxTgRvNoDwuux7UHKnE_Y5-zVd4wmGvNk2ceHjKb8ORnzw0cGwfmVu42g9dL7XyJLf1NEzaztboTWcm0Ogxuojoeo=@willsroot.io/
Severity
5.5 (Medium)
Assigner
References
11 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < fed3570e548a6c9f95c5f4c9e1a7afc1679fd90d
(git)
Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 5c0506cd1b1a3b145bda2612bbf7fe78d186c355 (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 850226aef8d28a00cf966ef26d2f8f2bff344535 (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 890a5d423ef0a7bd13447ceaffad21189f557301 (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 7ff2d83ecf2619060f30ecf9fad4f2a700fca344 (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < e5c480dc62a3025b8428d4818e722da30ad6804f (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 3691f84269a23f7edd263e9b6edbc27b7ae332f4 (git) Affected: 512bb43eb5422ee69a1be05ea0d89dc074fac9a2 , < 0e1d5d9b5c5966e2e42e298670808590db5ed628 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.29
Unaffected: 0 , < 2.6.29 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.147 , ≤ 6.1.* (semver) Unaffected: 6.6.100 , ≤ 6.6.* (semver) Unaffected: 6.12.40 , ≤ 6.12.* (semver) Unaffected: 6.15.8 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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Because of this, netem_dequeue calls qdisc_tree_reduce_backlog, and\\n since qlen is now 0, it calls htb_qlen_notify -\u003e htb_deactivate -\u003e\\n htb_deactiviate_prios -\u003e htb_remove_class_from_row -\u003e htb_safe_rb_erase\\n5. As this is the only class in the selected hprio rbtree,\\n __rb_change_child in __rb_erase_augmented sets the rb_root pointer to\\n NULL\\n6. Because blackhole_dequeue returns NULL, netem_dequeue returns NULL,\\n which causes htb_dequeue_tree to call htb_lookup_leaf with the same\\n hprio rbtree, and fail the BUG_ON\\n\\nThe function graph for this scenario is shown here:\\n 0) | htb_enqueue() {\\n 0) + 13.635 us | netem_enqueue();\\n 0) 4.719 us | htb_activate_prios();\\n 0) # 2249.199 us | }\\n 0) | htb_dequeue() {\\n 0) 2.355 us | htb_lookup_leaf();\\n 0) | netem_dequeue() {\\n 0) + 11.061 us | blackhole_enqueue();\\n 0) | qdisc_tree_reduce_backlog() {\\n 0) | qdisc_lookup_rcu() {\\n 0) 1.873 us | qdisc_match_from_root();\\n 0) 6.292 us | }\\n 0) 1.894 us | htb_search();\\n 0) | htb_qlen_notify() {\\n 0) 2.655 us | htb_deactivate_prios();\\n 0) 6.933 us | }\\n 0) + 25.227 us | }\\n 0) 1.983 us | blackhole_dequeue();\\n 0) + 86.553 us | }\\n 0) # 2932.761 us | qdisc_warn_nonwc();\\n 0) | htb_lookup_leaf() {\\n 0) | BUG_ON();\\n ------------------------------------------\\n\\nThe full original bug report can be seen here [1].\\n\\nWe can fix this just by returning NULL instead of the BUG_ON,\\nas htb_dequeue_tree returns NULL when htb_lookup_leaf returns\\nNULL.\\n\\n[1] https://lore.kernel.org/netdev/pF5XOOIim0IuEfhI-SOxTgRvNoDwuux7UHKnE_Y5-zVd4wmGvNk2ceHjKb8ORnzw0cGwfmVu42g9dL7XyJLf1NEzaztboTWcm0Ogxuojoeo=@willsroot.io/\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: Devuelve NULL cuando htb_lookup_leaf encuentra un rbtree vac\u00edo htb_lookup_leaf tiene un BUG_ON que puede activarse con lo siguiente: tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class add dev lo parent 1: classid 1:1 htb rate 64bit tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2:1 handle 3: blackhole ping -I lo -c1 -W0.001 127.0.0.1 La causa ra\u00edz es la siguiente: 1. htb_dequeue llama a htb_dequeue_tree, que llama al controlador de dequeue en el qdisc de hoja seleccionado 2. netem_dequeue llama a enqueue en el hijo qdisc 3. blackhole_enqueue descarta el paquete y devuelve un valor que no es solo NET_XMIT_SUCCESS 4. Debido a esto, netem_dequeue llama a qdisc_tree_reduce_backlog y, dado que qlen ahora es 0, llama a htb_qlen_notify -\u0026gt; htb_deactivate -\u0026gt; htb_deactiviate_prios -\u0026gt; htb_remove_class_from_row -\u0026gt; htb_safe_rb_erase 5. Como esta es la \u00fanica clase en el rbtree hprio seleccionado, __rb_change_child en __rb_erase_augmented establece el puntero rb_root en NULL 6. Debido a que blackhole_dequeue devuelve NULL, netem_dequeue devuelve NULL, lo que hace que htb_dequeue_tree llame a htb_lookup_leaf con el mismo rbtree hprio y falle el BUG_ON Se muestra el gr\u00e1fico de funciones para este escenario aqu\u00ed: 0) | htb_enqueue() { 0) + 13.635 us | netem_enqueue(); 0) 4.719 us | htb_activate_prios(); 0) # 2249.199 us | } 0) | htb_dequeue() { 0) 2.355 us | htb_lookup_leaf(); 0) | netem_dequeue() { 0) + 11.061 us | blackhole_enqueue(); 0) | qdisc_tree_reduce_backlog() { 0) | qdisc_lookup_rcu() { 0) 1.873 us | qdisc_match_from_root(); 0) 6.292 us | } 0) 1.894 us | htb_search(); 0) | htb_qlen_notify() { 0) 2.655 us | htb_deactivate_prios(); 0) 6.933 us | } 0) + 25.227 us | } 0) 1.983 us | blackhole_dequeue(); 0) + 86.553 us | } 0) # 2932.761 us | qdisc_warn_nonwc(); 0) | htb_lookup_leaf() { 0) | BUG_ON(); ------------------------------------------ The full original bug report can be seen here [1]. We can fix this just by returning NULL instead of the BUG_ON, as htb_dequeue_tree returns NULL when htb_lookup_leaf returns NULL. [1] https://lore.kernel.org/netdev/pF5XOOIim0IuEfhI-SOxTgRvNoDwuux7UHKnE_Y5-zVd4wmGvNk2ceHjKb8ORnzw0cGwfmVu42g9dL7XyJLf1NEzaztboTWcm0Ogxuojoeo=@willsroot.io/\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/sch_htb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"fed3570e548a6c9f95c5f4c9e1a7afc1679fd90d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"5c0506cd1b1a3b145bda2612bbf7fe78d186c355\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"850226aef8d28a00cf966ef26d2f8f2bff344535\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"890a5d423ef0a7bd13447ceaffad21189f557301\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"7ff2d83ecf2619060f30ecf9fad4f2a700fca344\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"e5c480dc62a3025b8428d4818e722da30ad6804f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"3691f84269a23f7edd263e9b6edbc27b7ae332f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"512bb43eb5422ee69a1be05ea0d89dc074fac9a2\",\"lessThan\":\"0e1d5d9b5c5966e2e42e298670808590db5ed628\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/sch_htb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.29\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.29\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.147\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.100\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.40\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.8\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.29\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"B9F2FDF6-4EB5-4DFF-BC93-F12605A32B6E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-976C-463D0611F13F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.147\",\"matchCriteriaId\":\"A4FD62FC-0DAE-4ACE-8C9C-66156518C3E1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.100\",\"matchCriteriaId\":\"094B81E0-B756-4727-85CA-F3F8D1C9D116\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.40\",\"matchCriteriaId\":\"0099D5A4-B157-4D36-8858-982C7D579030\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.8\",\"matchCriteriaId\":\"C7AFE5B0-F3B1-4D30-B8BF-EDA0385C4746\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"09709862-E348-4378-8632-5A7813EDDC86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"415BF58A-8197-43F5-B3D7-D1D63057A26E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0517869-312D-4429-80C2-561086E1421C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"85421F4E-C863-4ABF-B4B4-E887CC2F7F92\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3827F0D4-5FEE-4181-B267-5A45E7CA11FC\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e1d5d9b5c5966e2e42e298670808590db5ed628\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3691f84269a23f7edd263e9b6edbc27b7ae332f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c0506cd1b1a3b145bda2612bbf7fe78d186c355\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7ff2d83ecf2619060f30ecf9fad4f2a700fca344\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/850226aef8d28a00cf966ef26d2f8f2bff344535\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/890a5d423ef0a7bd13447ceaffad21189f557301\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e5c480dc62a3025b8428d4818e722da30ad6804f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fed3570e548a6c9f95c5f4c9e1a7afc1679fd90d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:08:56+00:00",
"cve": "CVE-2025-38468",
"id": "CVE-2025-38468",
"initial_release_date": "2025-07-28T00:00:00+00:00",
"product_status:fixed": "309",
"product_status:known_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38468.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-03T00:14:39Z",
"cve": "CVE-2025-38468",
"id": "CVE-2025-38468",
"initial_release_date": "2025-07-28T23:22:59Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "537",
"product_status:known_not_affected": "43",
"product_status:recommended": "836",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-38468",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38468.json",
"version": "57"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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.
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