CVE-2025-38115

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38115", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.986Z", "datePublished": "2025-07-03T08:35:23.750Z", "dateUpdated": "2026-10-15T21:52:08.900Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:39.505Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q->tail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is the SFQ qdisc, reached by configuring a qdisc via tc/netlink on a local netdevice and then driving local transmit traffic through it; there is no path for an unauthenticated remote peer to install the qdisc or control the requeue/limit conditions. Per kernel scoring convention, tc/qdisc netlink-configured subsystems are Local.\nAC:L - The attacker controls every precondition \u2014 SFQ limit, the veth/NAPI setup that forces NETDEV_TX_BUSY requeues into gso_skb, the number of flows, and the traffic rate \u2014 so the \"empty SFQ + inflated q.qlen + single-slot drop\" state is reached deterministically, as demonstrated by the upstream reproducer. No race window or uncontrollable memory layout is required.\nPR:L - Creating the veth pair and installing the SFQ qdisc requires only CAP_NET_ADMIN within a network namespace, which any unprivileged local user obtains via `unshare -Urn`; no real root in the init namespace is needed. Basic local user access is therefore sufficient.\nUI:N - The attacker sets up the qdisc and generates the traffic entirely on their own; no victim action, mount, or file open is involved.\nS:U - The corruption occurs in kernel memory and the resulting compromise stays within the same security authority (kernel/host); no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The stale q->tail leads to slot->qlen underflowing to 65535, causing sfq_link() to read q->dep[65535] roughly 256 KB out of bounds, and the emptied slot is returned as a fake sk_buff whose contents are read as skb->len/skb->data/GSO fields by the transmit path \u2014 both yield disclosure of adjacent kernel memory and, via heap grooming, arbitrary read.\nI:H - sfq_link() performs out-of-bounds writes (`q->dep[65535].next = x` and `sfq_dep_head(q, n)->prev = x` with n taken from out-of-bounds memory), and the type-confused sfq_slot is ultimately freed into skbuff_head_cache \u2014 an OOB write plus wild free that is leverageable for control-flow hijack and privilege escalation.\nA:H - Dequeuing from the stale empty slot reliably produces a bogus sk_buff handed to the device driver plus out-of-bounds accesses, causing kernel oops/panic (the reported symptom is a crash), and the condition can be re-triggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_sfq.c"], "versions": [{"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69", "status": "affected", "versionType": "git"}, {"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "82ffbe7776d0ac084031f114167712269bf3d832", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_sfq.c"], "versions": [{"version": 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.15.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"}, {"url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"}, {"url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"}, {"url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"}, {"url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"}, {"url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"}, {"url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"}, {"url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"}], "title": "net_sched: sch_sfq: fix a potential crash on gso_skb handling", "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"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:18.395Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38115", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:47:38.082535Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:52:08.900Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:18.395Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38115", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:47:38.082535Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:47:38.882Z"}}], "cna": {"title": "net_sched: sch_sfq: fix a potential crash on gso_skb handling", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is the SFQ qdisc, reached by configuring a qdisc via tc/netlink on a local netdevice and then driving local transmit traffic through it; there is no path for an unauthenticated remote peer to install the qdisc or control the requeue/limit conditions. Per kernel scoring convention, tc/qdisc netlink-configured subsystems are Local.\nAC:L - The attacker controls every precondition \u2014 SFQ limit, the veth/NAPI setup that forces NETDEV_TX_BUSY requeues into gso_skb, the number of flows, and the traffic rate \u2014 so the \"empty SFQ + inflated q.qlen + single-slot drop\" state is reached deterministically, as demonstrated by the upstream reproducer. No race window or uncontrollable memory layout is required.\nPR:L - Creating the veth pair and installing the SFQ qdisc requires only CAP_NET_ADMIN within a network namespace, which any unprivileged local user obtains via `unshare -Urn`; no real root in the init namespace is needed. Basic local user access is therefore sufficient.\nUI:N - The attacker sets up the qdisc and generates the traffic entirely on their own; no victim action, mount, or file open is involved.\nS:U - The corruption occurs in kernel memory and the resulting compromise stays within the same security authority (kernel/host); no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The stale q->tail leads to slot->qlen underflowing to 65535, causing sfq_link() to read q->dep[65535] roughly 256 KB out of bounds, and the emptied slot is returned as a fake sk_buff whose contents are read as skb->len/skb->data/GSO fields by the transmit path \u2014 both yield disclosure of adjacent kernel memory and, via heap grooming, arbitrary read.\nI:H - sfq_link() performs out-of-bounds writes (`q->dep[65535].next = x` and `sfq_dep_head(q, n)->prev = x` with n taken from out-of-bounds memory), and the type-confused sfq_slot is ultimately freed into skbuff_head_cache \u2014 an OOB write plus wild free that is leverageable for control-flow hijack and privilege escalation.\nA:H - Dequeuing from the stale empty slot reliably produces a bogus sk_buff handed to the device driver plus out-of-bounds accesses, causing kernel oops/panic (the reported symptom is a crash), and the condition can be re-triggered at will."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69", "versionType": "git"}, {"status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "lessThan": "82ffbe7776d0ac084031f114167712269bf3d832", "versionType": "git"}], "programFiles": ["net/sched/sch_sfq.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.16"}, 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[{"url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"}, {"url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"}, {"url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"}, {"url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"}, {"url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"}, {"url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"}, {"url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"}, {"url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q->tail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.295", "versionStartIncluding": "4.16"}, {"criteria": 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"versionStartIncluding": "4.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:39.505Z"}}}, "cveMetadata": {"cveId": "CVE-2025-38115", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:52:08.900Z", "dateReserved": "2025-04-16T04:51:23.986Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-07-03T08:35:23.750Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}, {"lessThan": "82ffbe7776d0ac084031f114167712269bf3d832", "status": "affected", "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.16"}, {"lessThan": "4.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.295", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.239", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.186", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.142", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.94", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.34", "versionType": "semver"}, {"lessThanOrEqual": "6.15.*", "status": "unaffected", "version": "6.15.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C32D9D17-384D-4914-8E02-A7F29752ABAB", "versionEndExcluding": "5.4.295", "versionStartIncluding": "4.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C3D14F4C-A21E-465D-A928-5CCE684E2B98", "versionEndExcluding": "5.10.239", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D96F2C0D-0D4A-4658-AD34-D8A626EA422D", "versionEndExcluding": "5.15.186", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "459B4E94-FE0E-434D-B782-95E3A5FFC6B1", "versionEndExcluding": "6.1.142", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "304E3F01-7D7A-4908-994E-7F95C5C00B06", "versionEndExcluding": "6.6.94", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4FFA54AA-CDFE-4591-BD07-72813D0948F4", "versionEndExcluding": "6.12.34", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0541C761-BD5E-4C1A-8432-83B375D7EB92", "versionEndExcluding": "6.15.3", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q->tail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: se corrige un posible fallo en la gesti\u00f3n de gso_skb. SFQ asume que siempre puede poner en cola al menos un paquete. Sin embargo, tras la confirmaci\u00f3n responsable, sch->q.len puede inflarse con paquetes en sch->gso_skb, y una operaci\u00f3n enqueue() en una qdisc SFQ vac\u00eda puede ir seguida de un descarte inmediato. Corrija sfq_drop() para que borre correctamente q->tail en esta situaci\u00f3n. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & "}], "id": "CVE-2025-38115", "lastModified": "2026-10-15T22:18:27.983", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38115", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:47:38.082535Z", "version": "2.0.3"}}]}, "published": "2025-07-03T09:15:25.350", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net_sched: sch_sfq: fix a potential crash on gso_skb handling", "id": "2376074", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376074"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\nSFQ has an assumption of always being able to queue at least one packet.\nHowever, after the blamed commit, sch->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\nFix sfq_drop() to properly clear q->tail in this situation.\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\nip netns exec lb netserver\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"], "name": "CVE-2025-38115", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38115\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38115\nhttps://lore.kernel.org/linux-cve-announce/2025070325-CVE-2025-38115-cce2@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-06T22:16:21.949237+00:00", "updated": "2025-07-06T22:16:21.949291+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}