CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
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.
Засегнати продукти
- Linux Linux: 1d036d25e5609ba73fee6a88db01c306b140d512 преди 0f4c9754956b86de158a4af5278c5cf5bda9439e; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 714aa973da8163925eda7efd49361ccbee21ee46; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 1490f82353bdabc09265a74e645b07f05cf4188e; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 74e2db36fe50e3ad9d5300d7fd0e6e2a15a6d121; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 3a1bf9116ea31470b89692585c3910dfe830dcdd; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 28324a3b62d9ce7f9bdd65a8ce63f382041d1b27; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 48a6ef291a17639e1b6ae0fbe9c8b2bb87d7804b; 1d036d25e5609ba73fee6a88db01c306b140d512 преди 2c054e17d9d41f1020376806c7f750834ced4dc5
- Linux Linux: 4.6; преди 4.6; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.136 до 6.6.*; 6.12.84 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък
Siemens: още 4 продукта, добавени от Siemens
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Вид слабост
История
- 1 май 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-31700
- https://nvd.nist.gov/vuln/detail/CVE-2026-31700
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html