# CVE-2023-52604: linux: In the Linux kernel, the following vulnerability has been resolved:  FS:JFS:UBSAN:array-index-out-of-bounds in dbAdjT...

CVE-2023-52604 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52604, released March 6, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-52604
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 6, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  FS:JFS:UBSAN:array-index-out-of-bounds in dbAdjTree  Syzkaller reported the following issue:  UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2867:6 index 196694 is out of range for type 's8[1365]' (aka 'signed char[1365]') CPU: 1 PID: 109 Comm: jfsCommit Not tainted 6.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106  ubsan_epilogue lib/ubsan.c:217 [inline]  __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348  dbAdjTree+0x474/0x4f0 fs/jfs/jfs_dmap.c:2867  dbJoin+0x210/0x2d0 fs/jfs/jfs_dmap.c:2834  dbFreeBits+0x4eb/0xda0 fs/jfs/jfs_dmap.c:2331  dbFreeDmap fs/jfs/jfs_dmap.c:2080 [inline]  dbFree+0x343/0x650 fs/jfs/jfs_dmap.c:402  txFreeMap+0x798/0xd50 fs/jfs/jfs_txnmgr.c:2534  txUpdateMap+0x342/0x9e0  txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]  jfs_lazycommit+0x47a/0xb70 fs/jfs/jfs_txnmgr.c:2732  kthread+0x2d3/0x370 kernel/kthread.c:388  ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304  </TASK> ================================================================================ Kernel panic - not syncing: UBSAN: panic_on_warn set ... CPU: 1 PID: 109 Comm: jfsCommit Not tainted 6.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106  panic+0x30f/0x770 kernel/panic.c:340  check_panic_on_warn+0x82/0xa0 kernel/panic.c:236  ubsan_epilogue lib/ubsan.c:223 [inline]  __ubsan_handle_out_of_bounds+0x13c/0x150 lib/ubsan.c:348  dbAdjTree+0x474/0x4f0 fs/jfs/jfs_dmap.c:2867  dbJoin+0x210/0x2d0 fs/jfs/jfs_dmap.c:2834  dbFreeBits+0x4eb/0xda0 fs/jfs/jfs_dmap.c:2331  dbFreeDmap fs/jfs/jfs_dmap.c:2080 [inline]  dbFree+0x343/0x650 fs/jfs/jfs_dmap.c:402  txFreeMap+0x798/0xd50 fs/jfs/jfs_txnmgr.c:2534  txUpdateMap+0x342/0x9e0  txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]  jfs_lazycommit+0x47a/0xb70 fs/jfs/jfs_txnmgr.c:2732  kthread+0x2d3/0x370 kernel/kthread.c:388  ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304  </TASK> Kernel Offset: disabled Rebooting in 86400 seconds..  The issue is caused when the value of lp becomes greater than CTLTREESIZE which is the max size of stree. Adding a simple check solves this issue.  Dave: As the function returns a void, good error handling would require a more intrusive code reorganization, so I modified Osama's patch at use WARN_ON_ONCE for lack of a cleaner option.  The patch is tested via syzbot.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.82-1 | [DEBIAN-CVE-2023-52604](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52604.md) | Mar 6, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.7.7-1 | [DEBIAN-CVE-2023-52604](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52604.md) | Mar 6, 2024 |
| Linux | linux Debian 14 | 6.7.7-1 | [DEBIAN-CVE-2023-52604](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52604.md) | Mar 6, 2024 |

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