Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In netem_enqueue(), the packet corruption logic uses get_random_u32_below(skb_headlen(skb)) to select an index for modifying skb->data. When an AF_PACKET TX_RING sends fully non-linear packets over an IPIP tunnel, skb_headlen(skb) evaluates to 0. Passing 0 to get_random_u32_below() takes the variable-ceil slow path which returns an unconstrained 32-bit random integer. Using this unconstrained value as an offset into skb->data results in an out-of-bounds memory access. Fix this by verifying skb_headlen(skb) is non-zero before attempting to corrupt the linear data area. Fully non-linear packets will silently bypass the corruption logic.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c865e5d99e25a171e8262fc0f7ba608568633c64 before a14b56863348686dd0387eea8ce66b85cf455908; affected c865e5d99e25a171e8262fc0f7ba608568633c64 before 13a66ca1e235d4bcd53d12d4c68490cad7f8e46f; affected c865e5d99e25a171e8262fc0f7ba608568633c64 before 3a2999704ac36cfb4041fed3652d26a3373e8d12; affected c865e5d99e25a171e8262fc0f7ba608568633c64 before 4fd258e281fa8bc15e9ce2c7691941537e9258ad; affected c865e5d99e25a171e8262fc0f7ba608568633c64 before d64cb81dcbd54927515a7f65e5e24affdc73c14b |
| Linux / Linux | affected 2.6.16; unaffected 0 before 2.6.16; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908
- https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f
- https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12
- https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad
- https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b
ADP enrichment
No English description supplied.
No references supplied.