Linux: Out-of-bounds Read
CVE-2022-49094 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 2b7d14c105dd8f6412eda5a91e1e6154653731e3, 589154d0f18945f41d138a5b4e49e518d294474b, 6e2f1b033b17dedda51d465861b69e58317d6343 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 0.67% chance of exploitation within 30 days, higher than 53% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 2b7d14c105dd8f6412eda5a91e1e6154653731e3 or 589154d0f18945f41d138a5b4e49e518d294474b or 6e2f1b033b17dedda51d465861b69e58317d6343 or 29be1816cbab9a0dc6243120939fd10a92753756, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.4.189 or 5.10.111 or 5.15.34 or 5.16.20, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 2b7d14c105dd8f6412eda5a91e1e6154653731e3; f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 589154d0f18945f41d138a5b4e49e518d294474b; f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 6e2f1b033b17dedda51d465861b69e58317d6343; f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 29be1816cbab9a0dc6243120939fd10a92753756; f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 2304660ab6c425df64d95301b601424c6a50f28b; f295b3ae9f5927e084bd5decdff82390e3471801 up to, but not including, 9381fe8c849cfbe50245ac01fc077554f6eaa0e2; 5.2 | 2b7d14c105dd8f6412eda5a91e1e6154653731e3, 589154d0f18945f41d138a5b4e49e518d294474b, 6e2f1b033b17dedda51d465861b69e58317d6343, 29be1816cbab9a0dc6243120939fd10a92753756, 2304660ab6c425df64d95301b601424c6a50f28b, 9381fe8c849cfbe50245ac01fc077554f6eaa0e2 |
| Linux | Linux Kernel | 5.2 up to, but not including, 5.4.189; 5.5 up to, but not including, 5.10.111; 5.11 up to, but not including, 5.15.34; 5.16 up to, but not including, 5.16.20; 5.17 up to, but not including, 5.17.3; 5.18 | 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3 |
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.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: net/tls: fix slab-out-of-bounds bug in decrypt_internal The memory size of tls_ctx->rx.iv for AES128-CCM is 12 setting in tls_set_sw_offload(). The return value of crypto_aead_ivsize() for "ccm(aes)" is 16. So memcpy() require 16 bytes from 12 bytes memory space will trigger slab-out-of-bounds bug as following: ================================================================== BUG: KASAN: slab-out-of-bounds in decrypt_internal+0x385/0xc40 [tls] Read of size 16 at addr ffff888114e84e60 by task tls/10911 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 print_report.cold+0x5e/0x5db ? decrypt_internal+0x385/0xc40 [tls] kasan_report+0xab/0x120 ? decrypt_internal+0x385/0xc40 [tls] kasan_check_range+0xf9/0x1e0 memcpy+0x20/0x60 decrypt_internal+0x385/0xc40 [tls] ? tls_get_rec+0x2e0/0x2e0 [tls] ? process_rx_list+0x1a5/0x420 [tls] ? tls_setup_from_iter.constprop.0+0x2e0/0x2e0 [tls] decrypt_skb_update+0x9d/0x400 [tls] tls_sw_recvmsg+0x3c8/0xb50 [tls] Allocated by task 10911: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0x81/0xa0 tls_set_sw_offload+0x2eb/0xa20 [tls] tls_setsockopt+0x68c/0x700 [tls] __sys_setsockopt+0xfe/0x1b0 Replace the crypto_aead_ivsize() with prot->iv_size + prot->salt_size when memcpy() iv value in TLS_1_3_VERSION scenario.
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: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/2304660ab6c425df64d95301b601424c6a50f28b
- git.kernel.org/stable/c/29be1816cbab9a0dc6243120939fd10a92753756
- git.kernel.org/stable/c/2b7d14c105dd8f6412eda5a91e1e6154653731e3
- git.kernel.org/stable/c/589154d0f18945f41d138a5b4e49e518d294474b
- git.kernel.org/stable/c/6e2f1b033b17dedda51d465861b69e58317d6343
- git.kernel.org/stable/c/9381fe8c849cfbe50245ac01fc077554f6eaa0e2
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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