CVE-2026-31657: Linux, грешка в паметта

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

Засегнати продукти

• Linux Linux: 23721387c409087fd3b97e274f34d3ddc0970b74 преди 5202f071b367ffbc8e279fc7a00db14f5e587f52; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 69d1ce9c72eca91203ffdb8d08bacd511100aec6; 23721387c409087fd3b97e274f34d3ddc0970b74 преди f4858832ddef2f39f21e30b7226bbcd3c4b2bc96; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 2f55b58b5a0bbed192d60c444a45a49cdf1b545f; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 7962b522222628596ca9ecc8722efc95367aadbd; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 4dee4c0688443aaf5bbec74aa203c851d1d53c35; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 1f2dc36c297d27733f1b380ea644cf15a361bd7b; 23721387c409087fd3b97e274f34d3ddc0970b74 преди 82d8701b2c930d0e96b0dbc9115a218d791cb0d2
• Linux Linux: 3.5; преди 3.5; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.169 до 6.1.*; 6.6.135 до 6.6.*; 6.12.82 до 6.12.*; 6.18.23 до 6.18.*; 6.19.13 до 6.19.*; 7.0 до *

Вид слабост

• CWE-416 Използване на памет след освобождаване (Use-After-Free)

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-31657
• https://nvd.nist.gov/vuln/detail/CVE-2026-31657
• https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
• https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
• https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
• https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
• https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
• https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
• https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
• https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2