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Message-ID: <2025091852-CVE-2022-50403-0471@gregkh> Date: Thu, 18 Sep 2025 18:03:53 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-50403: ext4: fix undefined behavior in bit shift for ext4_check_flag_values From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: ext4: fix undefined behavior in bit shift for ext4_check_flag_values Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in fs/ext4/ext4.h:591:2 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c ext4_init_fs+0x5a/0x277 do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK> The Linux kernel CVE team has assigned CVE-2022-50403 to this issue. Affected and fixed versions =========================== Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 4.9.337 with commit dd5639d36a5e4e42fd0fe05cc0b2ad9ddd3fca9d Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 4.14.303 with commit d7f93fc6fba8ff017be871be7edf8614a785ccad Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 4.19.270 with commit 743e9d708743d98464ccbd56e820d87dc6d1d629 Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 5.4.229 with commit 4690a4bdcf1470cb161aff1be30bd143b9dffd89 Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 5.10.163 with commit f9cd6980800bbfd11bf94eb5f942049d4d4eaa52 Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 5.15.87 with commit 205ac16628aca9093931fcbdb4bcd00d0eb94132 Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 6.0.18 with commit 5da9e607547f73dc7a643f35b0487992fd66910f Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 6.1.4 with commit 7753d6657873a2523a9989e6c09090cd503bbcda Issue introduced in 3.8 with commit 9a4c8019471386c6fb039ae9e30f5216b6b55a9e and fixed in 6.2 with commit 3bf678a0f9c017c9ba7c581541dbc8453452a7ae 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-2022-50403 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: fs/ext4/ext4.h 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/dd5639d36a5e4e42fd0fe05cc0b2ad9ddd3fca9d https://git.kernel.org/stable/c/d7f93fc6fba8ff017be871be7edf8614a785ccad https://git.kernel.org/stable/c/743e9d708743d98464ccbd56e820d87dc6d1d629 https://git.kernel.org/stable/c/4690a4bdcf1470cb161aff1be30bd143b9dffd89 https://git.kernel.org/stable/c/f9cd6980800bbfd11bf94eb5f942049d4d4eaa52 https://git.kernel.org/stable/c/205ac16628aca9093931fcbdb4bcd00d0eb94132 https://git.kernel.org/stable/c/5da9e607547f73dc7a643f35b0487992fd66910f https://git.kernel.org/stable/c/7753d6657873a2523a9989e6c09090cd503bbcda https://git.kernel.org/stable/c/3bf678a0f9c017c9ba7c581541dbc8453452a7ae
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