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Date: Tue, 2 Apr 2024 08:22:29 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26665: tunnels: fix out of bounds access when building IPv6 PMTU error Description =========== In the Linux kernel, the following vulnerability has been resolved: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs. The Linux kernel CVE team has assigned CVE-2024-26665 to this issue. Affected and fixed versions =========================== Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 5.10.210 with commit e77bf828f1ca Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 5.15.149 with commit d964dd1bc145 Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 6.1.78 with commit e37cde7a5716 Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 6.6.17 with commit 510c869ffa40 Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 6.7.5 with commit 7dc9feb8b170 Issue introduced in 5.9 with commit 4cb47a8644cc and fixed in 6.8 with commit d75abeec401f 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-2024-26665 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/ipv4/ip_tunnel_core.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/e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d https://git.kernel.org/stable/c/d964dd1bc1452594b4207d9229c157d9386e5d8a https://git.kernel.org/stable/c/e37cde7a5716466ff2a76f7f27f0a29b05b9a732 https://git.kernel.org/stable/c/510c869ffa4068c5f19ff4df51d1e2f3a30aaac1 https://git.kernel.org/stable/c/7dc9feb8b1705cf00de20563b6bc4831f4c99dab https://git.kernel.org/stable/c/d75abeec401f8c86b470e7028a13fcdc87e5dd06
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