net_sched: prio: fix a race in prio_tune()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38083
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-20 12:15:21 UTC
Updated2026-05-12 13:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-362

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 53d11560e957d53ee87a0653d258038ce12361b7 git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 4483d8b9127591c60c4eb789d6cab953bc4522a9 git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 46c15c9d0f65c9ba857d63f53264f4b17e8a715f git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 e3f6745006dc9423d2b065b90f191cfa11b1b584 git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 93f9eeb678d4c9c1abf720b3615fa8299a490845 git Not specified
CNA Linux Linux affected 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 d35acc1be3480505b5931f17e4ea9b7617fea4d3 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.4.295 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.239 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.186 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.142 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.94 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.34 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.3 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/53d11560e957d53ee87a0653d258038ce12361b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4483d8b9127591c60c4eb789d6cab953bc4522a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
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