Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes. To fix the incorrect behavior, skb_do_redirect return values can be simply discarded, the same as tc-egress behavior. On the other hand, bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU information. Thus convert its return values to avoid the conflict with LWTUNNEL_XMIT_CONTINUE.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before 67f8f2bae8e7ac72e09def2b667e44704c4d1ee1; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before a97f221651fcdc891166e9bc270e3d9bfa5a0080; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before e3f647e4b642f9f6d32795a16f92c116c138d2af; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before 065d5f17096ec9161180e2c890afdff4dc6125f2; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before d68c17402442f5f494a2c3ebde5cb82f6aa9160a; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before 65583f9e070db7bece20710cfa2e3daeb0b831d9; affected 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 before 29b22badb7a84b783e3a4fffca16f7768fb31205 |
| Linux / Linux | affected 4.10; unaffected 0 before 4.10; unaffected 5.4.257 through 5.4.*; unaffected 5.10.195 through 5.10.*; unaffected 5.15.132 through 5.15.*; unaffected 6.1.53 through 6.1.*; unaffected 6.4.16 through 6.4.*; unaffected 6.5.3 through 6.5.*; unaffected 6.6 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/67f8f2bae8e7ac72e09def2b667e44704c4d1ee1
- https://git.kernel.org/stable/c/a97f221651fcdc891166e9bc270e3d9bfa5a0080
- https://git.kernel.org/stable/c/e3f647e4b642f9f6d32795a16f92c116c138d2af
- https://git.kernel.org/stable/c/065d5f17096ec9161180e2c890afdff4dc6125f2
- https://git.kernel.org/stable/c/d68c17402442f5f494a2c3ebde5cb82f6aa9160a
- https://git.kernel.org/stable/c/65583f9e070db7bece20710cfa2e3daeb0b831d9
- https://git.kernel.org/stable/c/29b22badb7a84b783e3a4fffca16f7768fb31205
ADP enrichment
No English description supplied.
No references supplied.