Linux: Out-of-bounds Read
CVE-2022-50497 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 0f1a48994b3e516d5c7fd5d12204fdba7a604771, ea6145370be8016755c43aca799815fc4b8c88b1, 97382a2639b1cd9631f6069061e9d7062cd2b098 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.17% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 0f1a48994b3e516d5c7fd5d12204fdba7a604771 or ea6145370be8016755c43aca799815fc4b8c88b1 or 97382a2639b1cd9631f6069061e9d7062cd2b098 or 419b808504c26b3e3342365f34ccd0843e09a7f8, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.9.337 or 4.14.303 or 4.19.270 or 5.4.229, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 0f1a48994b3e516d5c7fd5d12204fdba7a604771; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, ea6145370be8016755c43aca799815fc4b8c88b1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 97382a2639b1cd9631f6069061e9d7062cd2b098; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 419b808504c26b3e3342365f34ccd0843e09a7f8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 88cea1676a09f7c45a1438153a126610c33b1590; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, a651bb5ff997b9f02662bcdef3d8b4e6f0d79656; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, a91123d4bda463469f68f0427adabf8108001f94; and 2 more ranges | 0f1a48994b3e516d5c7fd5d12204fdba7a604771, ea6145370be8016755c43aca799815fc4b8c88b1, 97382a2639b1cd9631f6069061e9d7062cd2b098, 419b808504c26b3e3342365f34ccd0843e09a7f8, dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8, 88cea1676a09f7c45a1438153a126610c33b1590 |
| Linux | Linux Kernel | 2.6.12.1 up to, but not including, 4.9.337; 4.10 up to, but not including, 4.14.303; 4.15 up to, but not including, 4.19.270; 4.20 up to, but not including, 5.4.229; 5.5 up to, but not including, 5.10.163; 5.11 up to, but not including, 5.15.86; 5.16 up to, but not including, 6.0.16; 6.1 up to, but not including, 6.1.2; and 1 more ranges | 4.9.337, 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.86 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: fix shift-out-of-bounds in check_special_flags UBSAN reported a shift-out-of-bounds warning: left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 ubsan_epilogue+0xa/0x44 lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322 check_special_flags fs/binfmt_misc.c:241 [inline] create_entry fs/binfmt_misc.c:456 [inline] bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654 vfs_write+0x11e/0x580 fs/read_write.c:582 ksys_write+0xcf/0x120 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4194e1 Since the type of Node's flags is unsigned long, we should define these macros with same type too.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/0f1a48994b3e516d5c7fd5d12204fdba7a604771
- git.kernel.org/stable/c/419b808504c26b3e3342365f34ccd0843e09a7f8
- git.kernel.org/stable/c/6a46bf558803dd2b959ca7435a5c143efe837217
- git.kernel.org/stable/c/88cea1676a09f7c45a1438153a126610c33b1590
- git.kernel.org/stable/c/97382a2639b1cd9631f6069061e9d7062cd2b098
- git.kernel.org/stable/c/a651bb5ff997b9f02662bcdef3d8b4e6f0d79656
- git.kernel.org/stable/c/a91123d4bda463469f68f0427adabf8108001f94
- git.kernel.org/stable/c/dcbc51d31d0afbd45e830e3cf565a7b3ca7bf0d8
- git.kernel.org/stable/c/ea6145370be8016755c43aca799815fc4b8c88b1
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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