CVE-2023-52566

Summary

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()

In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page.

NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly.

[konishi.ryusuke@gmail.com: NOTE added to the commit log]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < fb1084e63ee56958b0a56e17a50a4fd86445b9c1affected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < bb61224f6abc8e71bfdf06d7c984e23460875f5baffected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 193b5a1c6c67c36b430989dc063fe7ea4e200a33affected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 7130a87ca32396eb9bf48b71a2d42259ae44c6c7affected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 3936e8714907cd55e37c7cc50e50229e4a9042e8affected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 980663f1d189eedafd18d80053d9cf3e2ceb5c8caffected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 28df4646ad8b433340772edc90ca709cdefc53e2affected
LinuxLinuxa3d93f709e893187d301aa5458b2248db9f22bd1 < 7ee29facd8a9c5a26079148e36bcf07141b3a6bcaffected
LinuxLinux2.6.30affected
LinuxLinux0 < 2.6.30unaffected
LinuxLinux4.14.327 <= 4.14.*unaffected
LinuxLinux4.19.296 <= 4.19.*unaffected
LinuxLinux5.4.258 <= 5.4.*unaffected
LinuxLinux5.10.198 <= 5.10.*unaffected
LinuxLinux5.15.134 <= 5.15.*unaffected
LinuxLinux6.1.56 <= 6.1.*unaffected
LinuxLinux6.5.6 <= 6.5.*unaffected
LinuxLinux6.6 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References