From bippy-a5840b7849dd Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman To: Reply-to: , Subject: CVE-2024-26643: netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout Description =========== In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout While the rhashtable set gc runs asynchronously, a race allows it to collect elements from anonymous sets with timeouts while it is being released from the commit path. Mingi Cho originally reported this issue in a different path in 6.1.x with a pipapo set with low timeouts which is not possible upstream since 7395dfacfff6 ("netfilter: nf_tables: use timestamp to check for set element timeout"). Fix this by setting on the dead flag for anonymous sets to skip async gc in this case. According to 08e4c8c5919f ("netfilter: nf_tables: mark newset as dead on transaction abort"), Florian plans to accelerate abort path by releasing objects via workqueue, therefore, this sets on the dead flag for abort path too. The Linux kernel CVE team has assigned CVE-2024-26643 to this issue. Affected and fixed versions =========================== Issue introduced in 5.4.262 with commit bbdb3b65aa91 and fixed in 5.4.274 with commit edcf1a3f182e Issue introduced in 5.10.198 with commit 448be0774882 and fixed in 5.10.215 with commit e2d45f467096 Issue introduced in 5.15.134 with commit d19e8bf3ea41 and fixed in 5.15.154 with commit 291cca35818b Issue introduced in 6.1.56 with commit ea3eb9f2192e and fixed in 6.1.84 with commit 406b0241d0eb Issue introduced in 6.5 with commit 5f68718b34a5 and fixed in 6.6.24 with commit b2d6f9a5b1cf Issue introduced in 6.5 with commit 5f68718b34a5 and fixed in 6.7.12 with commit 5224afbc30c3 Issue introduced in 6.5 with commit 5f68718b34a5 and fixed in 6.8 with commit 552705a3650b Issue introduced in 6.4.11 with commit 0624f190b574 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-26643 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/netfilter/nf_tables_api.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033 https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363 https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163 https://git.kernel.org/stable/c/b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1 https://git.kernel.org/stable/c/5224afbc30c3ca9ba23e752f0f138729b2c48dd8 https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36