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THREATINT
PUBLISHED

CVE-2025-38108

net_sched: red: fix a race in __red_change()



Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, 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.

Reserved 2025-04-16 | Published 2025-07-03 | Updated 2025-07-03 | Assigner Linux

Product status

Default status
unaffected

0c8d13ac96070000da33f394f45e9c19638483c5 before 2790c4ec481be45a80948d059cd7c9a06bc37493
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before a1bf6a4e9264a685b0e642994031f9c5aad72414
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before 110a47efcf23438ff8d31dbd9c854fae2a48bf98
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before f569984417a4e12c67366e69bdcb752970de921d
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before 2a71924ca4af59ffc00f0444732b6cd54b153d0e
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before 4b755305b2b0618e857fdadb499365b5f2e478d1
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before 444ad445df5496a785705019268a8a84b84484bb
affected

0c8d13ac96070000da33f394f45e9c19638483c5 before 85a3e0ede38450ea3053b8c45d28cf55208409b8
affected

Default status
affected

5.0
affected

Any version before 5.0
unaffected

5.4.295
unaffected

5.10.239
unaffected

5.15.186
unaffected

6.1.142
unaffected

6.6.94
unaffected

6.12.34
unaffected

6.15.3
unaffected

6.16-rc2
unaffected

References

git.kernel.org/...c/2790c4ec481be45a80948d059cd7c9a06bc37493

git.kernel.org/...c/a1bf6a4e9264a685b0e642994031f9c5aad72414

git.kernel.org/...c/110a47efcf23438ff8d31dbd9c854fae2a48bf98

git.kernel.org/...c/f569984417a4e12c67366e69bdcb752970de921d

git.kernel.org/...c/2a71924ca4af59ffc00f0444732b6cd54b153d0e

git.kernel.org/...c/4b755305b2b0618e857fdadb499365b5f2e478d1

git.kernel.org/...c/444ad445df5496a785705019268a8a84b84484bb

git.kernel.org/...c/85a3e0ede38450ea3053b8c45d28cf55208409b8

cve.org (CVE-2025-38108)

nvd.nist.gov (CVE-2025-38108)

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