Linux: Out-of-bounds Read
CVE-2023-53333 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 337fdce450637ea663bc816edc2ba81e5cdad02e, 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8, c052797ac36813419ad3bfa54cb8615db4b41f15 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 0.28% 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 337fdce450637ea663bc816edc2ba81e5cdad02e or 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8 or c052797ac36813419ad3bfa54cb8615db4b41f15 or 5c618daa5038712c4a4ef8923905a2ea1b8836a1, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.4.251 or 5.10.188 or 5.15.121 or 6.1.39, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, 337fdce450637ea663bc816edc2ba81e5cdad02e; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, c052797ac36813419ad3bfa54cb8615db4b41f15; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, 5c618daa5038712c4a4ef8923905a2ea1b8836a1; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, 26bd1f210d3783a691052c51d76bb8a8bbd24c67; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, 8c0980493beed3a80d6329c44ab293dc8c032927; 2bc780499aa33311ec0f3e42624dfaa7be0ade5e up to, but not including, ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30; 2.6.26 | 337fdce450637ea663bc816edc2ba81e5cdad02e, 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8, c052797ac36813419ad3bfa54cb8615db4b41f15, 5c618daa5038712c4a4ef8923905a2ea1b8836a1, 26bd1f210d3783a691052c51d76bb8a8bbd24c67, 8c0980493beed3a80d6329c44ab293dc8c032927 |
| Linux | Linux Kernel | 2.6.26 up to, but not including, 5.4.251; 5.5 up to, but not including, 5.10.188; 5.11 up to, but not including, 5.15.121; 5.16 up to, but not including, 6.1.39; 6.2 up to, but not including, 6.3.13; 6.4 up to, but not including, 6.4.4 | 5.4.251, 5.10.188, 5.15.121, 6.1.39, 6.3.13, 6.4.4 |
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 | 8.2 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
| CVSS 3.1 | 7.1 | High | CISA (ADP) |
Official description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one Eric Dumazet says: nf_conntrack_dccp_packet() has an unique: dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); And nothing more is 'pulled' from the packet, depending on the content. dh->dccph_doff, and/or dh->dccph_x ...) So dccp_ack_seq() is happily reading stuff past the _dh buffer. BUG: KASAN: stack-out-of-bounds in nf_conntrack_dccp_packet+0x1134/0x11c0 Read of size 4 at addr ffff000128f66e0c by task syz-executor.2/29371 [..] Fix this by increasing the stack buffer to also include room for the extra sequence numbers and all the known dccp packet type headers, then pull again after the initial validation of the basic header. While at it, mark packets invalid that lack 48bit sequence bit but where RFC says the type MUST use them. Compile tested only. v2: first skb_header_pointer() now needs to adjust the size to only pull the generic header. (Eric) Heads-up: I intend to remove dccp conntrack support later this year.
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/26bd1f210d3783a691052c51d76bb8a8bbd24c67
- git.kernel.org/stable/c/337fdce450637ea663bc816edc2ba81e5cdad02e
- git.kernel.org/stable/c/5c618daa5038712c4a4ef8923905a2ea1b8836a1
- git.kernel.org/stable/c/8c0980493beed3a80d6329c44ab293dc8c032927
- git.kernel.org/stable/c/9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8
- git.kernel.org/stable/c/c052797ac36813419ad3bfa54cb8615db4b41f15
- git.kernel.org/stable/c/ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30
Recent Out-of-bounds Read vulnerabilities
- 7.8 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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