CVE-2025-68325
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop In cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen and backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes that the parent qdisc will enqueue the current packet. However, this assumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent qdisc stops enqueuing current packet, leaving the tree qlen/backlog accounting inconsistent. This mismatch can lead to a NULL dereference (e.g., when the parent Qdisc is qfq_qdisc). This patch computes the qlen/backlog delta in a more robust way by observing the difference before and after the series of cake_drop() calls, and then compensates the qdisc tree accounting if cake_enqueue() returns NET_XMIT_CN. To ensure correct compensation when ACK thinning is enabled, a new variable is introduced to keep qlen unchanged.
How to fix
- Linux Linuxa3f4e3de41a3f115db35276c6b186ccbc913934a, 38abf6e931b169ea88d7529b49096f53a5dcf8fe, fcb91be52eb6e92e00b533ebd7c77fecada537e1, d01f0e072dadb02fe10f436b940dd957aff0d7d4, 0b6216f9b3d1c33c76f74511026e5de5385ee520, 529c284cc2815c8350860e9a31722050fe7117cb, 3ed6c458530a547ed0c9ea0b02b19bab620be88b, 9fefc78f7f02d71810776fdeb119a05a946a27cc, 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.63, 5.5, 6.17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | de04ddd2980b48caa8d7e24a7db2742917a8b280 ≤ v < a3f4e3de41a3f115db35276c6b186ccbc913934a, 0dacfc5372e314d1219f03e64dde3ab495a5a25e ≤ v < 38abf6e931b169ea88d7529b49096f53a5dcf8fe, 710866fc0a64eafcb8bacd91bcb1329eb7e5035f ≤ v < fcb91be52eb6e92e00b533ebd7c77fecada537e1, aa12ee1c1bd260943fd6ab556d8635811c332eeb ≤ v < d01f0e072dadb02fe10f436b940dd957aff0d7d4, ff57186b2cc39766672c4c0332323933e5faaa88 ≤ v < 0b6216f9b3d1c33c76f74511026e5de5385ee520, 15de71d06a400f7fdc15bf377a2552b0ec437cf5 ≤ v < 529c284cc2815c8350860e9a31722050fe7117cb, 15de71d06a400f7fdc15bf377a2552b0ec437cf5 ≤ v < 3ed6c458530a547ed0c9ea0b02b19bab620be88b, 15de71d06a400f7fdc15bf377a2552b0ec437cf5 ≤ v < 9fefc78f7f02d71810776fdeb119a05a946a27cc, 7689ab22de36f8db19095f6bdf11f28cfde92f5c, 62d591dde4defb1333d202410609c4ddeae060b3, 5.10.241 ≤ v < 5.10.248, 5.15.190 ≤ v < 5.15.198, 6.1.149 ≤ v < 6.1.160, 6.6.103 ≤ v < 6.6.120, 6.12.44 ≤ v < 6.12.63, 5.4.297 ≤ v < 5.5, 6.16.4 ≤ v < 6.17, 6.17 | a3f4e3de41a3f115db35276c6b186ccbc913934a, 38abf6e931b169ea88d7529b49096f53a5dcf8fe, fcb91be52eb6e92e00b533ebd7c77fecada537e1, d01f0e072dadb02fe10f436b940dd957aff0d7d4, 0b6216f9b3d1c33c76f74511026e5de5385ee520, 529c284cc2815c8350860e9a31722050fe7117cb, 3ed6c458530a547ed0c9ea0b02b19bab620be88b, 9fefc78f7f02d71810776fdeb119a05a946a27cc, 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.63, 5.5, 6.17 |
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