Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd() In tpacket_snd(), when PACKET_VNET_HDR is enabled, vnet_hdr points directly into the mmap'd TX ring buffer shared with userspace. The kernel validates the header via __packet_snd_vnet_parse() but then re-reads all fields later in virtio_net_hdr_to_skb(). A concurrent userspace thread can modify the vnet_hdr fields between validation and use, bypassing all safety checks. The non-TPACKET path (packet_snd()) already correctly copies vnet_hdr to a stack-local variable. All other vnet_hdr consumers in the kernel (tun.c, tap.c, virtio_net.c) also use stack copies. The TPACKET TX path is the only caller of virtio_net_hdr_to_skb() that reads directly from user-controlled shared memory. Fix this by copying vnet_hdr from the mmap'd ring buffer to a stack-local variable before validation and use, consistent with the approach used in packet_snd() and all other callers.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 0f4c9754956b86de158a4af5278c5cf5bda9439e; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 714aa973da8163925eda7efd49361ccbee21ee46; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 1490f82353bdabc09265a74e645b07f05cf4188e; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 74e2db36fe50e3ad9d5300d7fd0e6e2a15a6d121; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 3a1bf9116ea31470b89692585c3910dfe830dcdd; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 28324a3b62d9ce7f9bdd65a8ce63f382041d1b27; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 48a6ef291a17639e1b6ae0fbe9c8b2bb87d7804b; affected 1d036d25e5609ba73fee6a88db01c306b140d512 before 2c054e17d9d41f1020376806c7f750834ced4dc5 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.136 through 6.6.*; unaffected 6.12.84 through 6.12.*; unaffected 6.18.25 through 6.18.*; unaffected 7.0.2 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0f4c9754956b86de158a4af5278c5cf5bda9439e
- https://git.kernel.org/stable/c/714aa973da8163925eda7efd49361ccbee21ee46
- https://git.kernel.org/stable/c/1490f82353bdabc09265a74e645b07f05cf4188e
- https://git.kernel.org/stable/c/74e2db36fe50e3ad9d5300d7fd0e6e2a15a6d121
- https://git.kernel.org/stable/c/3a1bf9116ea31470b89692585c3910dfe830dcdd
- https://git.kernel.org/stable/c/28324a3b62d9ce7f9bdd65a8ce63f382041d1b27
- https://git.kernel.org/stable/c/48a6ef291a17639e1b6ae0fbe9c8b2bb87d7804b
- https://git.kernel.org/stable/c/2c054e17d9d41f1020376806c7f750834ced4dc5
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.