Description
In the Linux kernel, the following vulnerability has been resolved: netlink: reset skb headers before unicast and multicast filtering Socket filters can use SKF_NET_OFF and SKF_LL_OFF to read relative to an skb's network and MAC headers. Netlink producers may reserve headroom without resetting those headers, allowing a receiving socket's filter to read data before the initialized message. For example, IWPM HELLO replies are allocated with dev_alloc_skb(), which reserves NET_SKB_PAD bytes. An unprivileged NETLINK_RDMA user can attach a classic socket filter and disclose this headroom through the length of the delivered reply. The resets in netlink_dump() do not help because IWPM sends a separately allocated skb through netlink_unicast(). Reset both headers before running the receiver's filter in unicast and broadcast delivery, as is already done for dump skbs. This also covers other netlink producers that reserve headroom without changing their allocation or message-building code.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b1153f29ee07dc1a788964409255a4b4fae50b98 to < 4123f8d2099863e2421187af9d87b45e8eebd867affectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < 6ec7cc02458c6a1509377a7f2eec9c7b1a355b5eaffectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < ea0e0fc4c72f71bd6d8bf460bfe309b61c35b548affectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < c69db9e1f5cf886d4e3011313761a0f63a1d0da0affectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < 06791594274f87c29f1a9f1961d700272716a49daffectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < 06935da5de83aa8b98841563894857e7d2f80e47affectedb1153f29ee07dc1a788964409255a4b4fae50b98 to < 8bf659bd54e1f00e34cf5244b1d289c506fa47c0affected
Linux Linux
Default version status: affected
2.6.26affected0 to < 2.6.26unaffected5.10.273 to ≤ 5.10.*unaffected5.15.224 to ≤ 5.15.*unaffected6.6.161 to ≤ 6.6.*unaffected6.12.115 to ≤ 6.12.*unaffected6.18.59 to ≤ 6.18.*unaffected7.2.13 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4123f8d2099863e2421187af9d87b45e8eebd867 ↗
- https://git.kernel.org/stable/c/6ec7cc02458c6a1509377a7f2eec9c7b1a355b5e ↗
- https://git.kernel.org/stable/c/ea0e0fc4c72f71bd6d8bf460bfe309b61c35b548 ↗
- https://git.kernel.org/stable/c/c69db9e1f5cf886d4e3011313761a0f63a1d0da0 ↗
- https://git.kernel.org/stable/c/06791594274f87c29f1a9f1961d700272716a49d ↗
- https://git.kernel.org/stable/c/06935da5de83aa8b98841563894857e7d2f80e47 ↗
- https://git.kernel.org/stable/c/8bf659bd54e1f00e34cf5244b1d289c506fa47c0 ↗