CVE-2024-26947: ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses
First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses Since commit a4d5613c4dc6 ("arm: extend pfn_valid to take into account freed memory map alignment") changes the semantics of pfn_valid() to check presence of the memory map for a PFN. A valid page for an address which is reserved but not mapped by the kernel[1], the system crashed during some uio test with the following memory layout: node 0: [mem 0x00000000c0a00000-0x00000000cc8fffff] node 0: [mem 0x00000000d0000000-0x00000000da1fffff] the uio layout is：0xc0900000, 0x100000 the crash backtrace like: Unable to handle kernel paging request at virtual address bff00000 [...] CPU: 1 PID: 465 Comm: startapp.bin Tainted: G O 5.10.0 #1 Hardware name: Generic DT based system PC is at b15_flush_kern_dcache_area+0x24/0x3c LR is at __sync_icache_dcache+0x6c/0x98 [...] (b15_flush_kern_dcache_area) from (__sync_icache_dcache+0x6c/0x98) (__sync_icache_dcache) from (set_pte_at+0x28/0x54) (set_pte_at) from (remap_pfn_range+0x1a0/0x274) (remap_pfn_range) from (uio_mmap+0x184/0x1b8 [uio]) (uio_mmap [uio]) from (__mmap_region+0x264/0x5f4) (__mmap_region) from (__do_mmap_mm+0x3ec/0x440) (__do_mmap_mm) from (do_mmap+0x50/0x58) (do_mmap) from (vm_mmap_pgoff+0xfc/0x188) (vm_mmap_pgoff) from (ksys_mmap_pgoff+0xac/0xc4) (ksys_mmap_pgoff) from (ret_fast_syscall+0x0/0x5c) Code: e0801001 e2423001 e1c00003 f57ff04f (ee070f3e) ---[ end trace 09cf0734c3805d52 ]--- Kernel panic - not syncing: Fatal exception So check if PG_reserved was set to solve this issue. [1]: https://lore.kernel.org/lkml/Zbtdue57RO0QScJM@linux.ibm.com/
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.24 | 6.6.24 |
| redhat/kernel | <6.7.12 | 6.7.12 |
| redhat/kernel | <6.8.3 | 6.8.3 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.123-1<=6.1.128-1 | 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/0c027c2bad7f5111c51a358b5d392e1a695dabff
- https://git.kernel.org/stable/c/0c66c6f4e21cb22220cbd8821c5c73fc157d20dc
- https://git.kernel.org/stable/c/9f7ddc222cae8254e93d5c169a8ae11a49d912a7
- https://git.kernel.org/stable/c/fb3a122a978626b33de3367ee1762da934c0f512
- https://launchpad.net/bugs/cve/CVE-2024-26947
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26947
- https://nvd.nist.gov/vuln/detail/CVE-2024-26947
- https://security-tracker.debian.org/tracker/CVE-2024-26947
- https://ubuntu.com/security/CVE-2024-26947
- https://git.kernel.org/linus/0c66c6f4e21cb22220cbd8821c5c73fc157d20dc
- https://access.redhat.com/security/cve/CVE-2024-26947
- https://lore.kernel.org/linux-cve-announce/2024050126-CVE-2024-26947-c9b8@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2278168
- https://access.redhat.com/errata/RHSA-2024:5067
- https://access.redhat.com/errata/RHSA-2024:5066
- https://access.redhat.com/errata/RHSA-2024:6997
- https://bugzilla.redhat.com/show_bug.cgi?id=2278167
Frequently Asked Questions
What is the severity of CVE-2024-26947?
CVE-2024-26947 is categorized as a high severity vulnerability in the Linux kernel.
How do I fix CVE-2024-26947?
To remediate CVE-2024-26947, update the Linux kernel to versions 6.6.24, 6.7.12, 6.8.3, 6.9, or specific patches in Debian Linux.
What systems are affected by CVE-2024-26947?
CVE-2024-26947 affects the Linux kernel across various distributions including Red Hat and Debian.
What are the potential risks of CVE-2024-26947?
Exploitation of CVE-2024-26947 could lead to unauthorized access or manipulation of system memory.
What is the nature of the vulnerability in CVE-2024-26947?
The vulnerability in CVE-2024-26947 involves improper checking of reserved memory addresses in the ARM architecture of the Linux kernel.
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