CyberSecBulletin
CVE-2026-46270NVD status: Analyzed

Linux: Use After Free

Published Updated By the CyberSecBulletin desk

CVE-2026-46270 is a high-severity use after free vulnerability in Linux, with a CVSS 3.1 base score of 8.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists versions d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc, 62d753b916bd500bb269b7078cdab73198ab4718, a39f8f06216f73ef40e71e2fe4ad071964c1fd36 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 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc or 62d753b916bd500bb269b7078cdab73198ab4718 or a39f8f06216f73ef40e71e2fe4ad071964c1fd36 or af261f218a7606f93d2c786353d60bb4feb56ef0, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.252 or 5.15.202 or 6.1.165 or 6.6.128, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxe86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, 62d753b916bd500bb269b7078cdab73198ab4718; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, a39f8f06216f73ef40e71e2fe4ad071964c1fd36; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, af261f218a7606f93d2c786353d60bb4feb56ef0; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, 2178dc65d45e2f7bcaa8af8d80d100419bdab251; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, 64e15155095f39f4dec9b4659da1238ef8fc54d4; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, 721449a15170fc5f028a7576d7f65b9f60d53482; e86d69dd786e94046b8f5be7df1b9a8226a40b2a up to, but not including, e2febe375e5ea5afed92f4cd9711bde8f24ee6d2; and 1 more rangesd4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc, 62d753b916bd500bb269b7078cdab73198ab4718, a39f8f06216f73ef40e71e2fe4ad071964c1fd36, af261f218a7606f93d2c786353d60bb4feb56ef0, 2178dc65d45e2f7bcaa8af8d80d100419bdab251, 64e15155095f39f4dec9b4659da1238ef8fc54d4
LinuxLinux Kernel4.2 up to, but not including, 5.10.252; 5.11 up to, but not including, 5.15.202; 5.16 up to, but not including, 6.1.165; 6.2 up to, but not including, 6.6.128; 6.7 up to, but not including, 6.12.75; 6.13 up to, but not including, 6.18.14; 6.19 up to, but not including, 6.19.45.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14

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
NoneNo account or login is needed.
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
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: power: supply: rt9455: Fix use-after-free in power_supply_changed() Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` handle will be deallocated/unregistered _before_ the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just _after_ the `power_supply` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory... Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing _before_ registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle *uninitialized* in `power_supply_changed()`. Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

How developers prevent this class of flaw

  • Choose a language that provides automatic memory management.
  • When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

More Use After Free vulnerabilities (CWE-416)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Recent Use After Free vulnerabilities

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