Linux: Out-of-bounds Read
CVE-2022-48999 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 cc3cd130ecfb8b0ae52e235e487bae3f16a24a32, 0b5394229ebae09afc07aabccb5ffd705ffd250e, 25174d91e4a32a24204060d283bd5fa6d0ddf133 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 0.26% 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 cc3cd130ecfb8b0ae52e235e487bae3f16a24a32 or 0b5394229ebae09afc07aabccb5ffd705ffd250e or 25174d91e4a32a24204060d283bd5fa6d0ddf133 or bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.4.226 or 5.10.158 or 5.15.82 or 6.0.12, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 493ced1ac47c48bb86d9d4e8e87df8592be85a0e up to, but not including, cc3cd130ecfb8b0ae52e235e487bae3f16a24a32; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e up to, but not including, 0b5394229ebae09afc07aabccb5ffd705ffd250e; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e up to, but not including, 25174d91e4a32a24204060d283bd5fa6d0ddf133; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e up to, but not including, bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e up to, but not including, 61b91eb33a69c3be11b259c5ea484505cd79f883; 5.3 | cc3cd130ecfb8b0ae52e235e487bae3f16a24a32, 0b5394229ebae09afc07aabccb5ffd705ffd250e, 25174d91e4a32a24204060d283bd5fa6d0ddf133, bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2, 61b91eb33a69c3be11b259c5ea484505cd79f883 |
| Linux | Linux Kernel | 5.3 up to, but not including, 5.4.226; 5.5 up to, but not including, 5.10.158; 5.11 up to, but not including, 5.15.82; 5.16 up to, but not including, 6.0.12 | 5.4.226, 5.10.158, 5.15.82, 6.0.12 |
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 | 7.1 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference Gwangun Jung reported a slab-out-of-bounds access in fib_nh_match: fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961 fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753 inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874 Separate nexthop objects are mutually exclusive with the legacy multipath spec. Fix fib_nh_match to return if the config for the to be deleted route contains a multipath spec while the fib_info is using a nexthop object.
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/0b5394229ebae09afc07aabccb5ffd705ffd250e
- git.kernel.org/stable/c/25174d91e4a32a24204060d283bd5fa6d0ddf133
- git.kernel.org/stable/c/61b91eb33a69c3be11b259c5ea484505cd79f883
- git.kernel.org/stable/c/bb20a2ae241be846bc3c11ea4b3a3c69e41d51f2
- git.kernel.org/stable/c/cc3cd130ecfb8b0ae52e235e487bae3f16a24a32
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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