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Date: Wed, 17 Apr 2024 12:28:59 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26884: bpf: Fix hashtab overflow check on 32-bit arches Description =========== In the Linux kernel, the following vulnerability has been resolved: bpf: Fix hashtab overflow check on 32-bit arches The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup. The Linux kernel CVE team has assigned CVE-2024-26884 to this issue. Affected and fixed versions =========================== Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 4.19.311 with commit 33ec04cadb77 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 5.4.273 with commit 92c81fbb3ed2 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 5.10.214 with commit 64f00b4df059 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 5.15.153 with commit 3b08cfc65f07 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 6.1.83 with commit a83fdaeaea36 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 6.6.23 with commit 8435f0961bf3 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 6.7.11 with commit d817f0d34d92 Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 6.8.2 with commit a6fa75b5096c Issue introduced in 3.19 with commit daaf427c6ab3 and fixed in 6.9-rc1 with commit 6787d916c2cf 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-2024-26884 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: kernel/bpf/hashtab.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/33ec04cadb77605b71d9298311919303d390c4d5 https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6 https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93 https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868 https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016 https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1
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