UBUNTU-CVE-2024-53112: Medium severity ubuntu/linux vulnerability
In the Linux kernel, the following vulnerability has been resolved: ocfs2: uncache inode which has failed entering the group Syzbot has reported the following BUG: kernel BUG at fs/ocfs2/uptodate.c:509! ... Call Trace: <TASK> ? diebody+0x5f/0xb0 ? die+0x9e/0xc0 ? dotrap+0x15a/0x3a0 ? ocfs2setnewbufferuptodate+0x145/0x160 ? doerrortrap+0x1dc/0x2c0 ? ocfs2setnewbufferuptodate+0x145/0x160 ? pfxdoerrortrap+0x10/0x10 ? handleinvalidop+0x34/0x40 ? ocfs2setnewbufferuptodate+0x145/0x160 ? excinvalidop+0x38/0x50 ? asmexcinvalidop+0x1a/0x20 ? ocfs2setnewbufferuptodate+0x2e/0x160 ? ocfs2setnewbufferuptodate+0x144/0x160 ? ocfs2setnewbufferuptodate+0x145/0x160 ocfs2groupadd+0x39f/0x15a0 ? pfxocfs2groupadd+0x10/0x10 ? pfxlockacquire+0x10/0x10 ? mntgetwriteaccess+0x68/0x2b0 ? pfxlockrelease+0x10/0x10 ? rcureadlockanyheld+0xb7/0x160 ? pfxrcureadlockanyheld+0x10/0x10 ? smacklog+0x123/0x540 ? mntgetwriteaccess+0x68/0x2b0 ? mntgetwriteaccess+0x68/0x2b0 ? mntgetwriteaccess+0x226/0x2b0 ocfs2ioctl+0x65e/0x7d0 ? pfxocfs2ioctl+0x10/0x10 ? smackfileioctl+0x29e/0x3a0 ? pfxsmackfileioctl+0x10/0x10 ? lockdephardirqsonprepare+0x43d/0x780 ? pfxlockdephardirqsonprepare+0x10/0x10 ? pfxocfs2ioctl+0x10/0x10 sesysioctl+0xfb/0x170 dosyscall64+0xf3/0x230 entrySYSCALL64afterhwframe+0x77/0x7f ... </TASK> When 'ioctl(OCFS2IOCGROUPADD, ...)' has failed for the particular inode in 'ocfs2verifygroupandinput()', corresponding buffer head remains cached and subsequent call to the same 'ioctl()' for the same inode issues the BUG() in 'ocfs2setnewbufferuptodate()' (trying to cache the same buffer head of that inode). Fix this by uncaching the buffer head with 'ocfs2removefromcache()' on error path in 'ocfs2groupadd()'.
Affected Software
Remediation
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 5.15.0-1074.77 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1083.92+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-135.146+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1079.88+fips1 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1027.29 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1027.32 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-58.60.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1026.29 - Upgrade
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ubuntu/linux-raspi-realtimeto a version that resolves this vulnerability.Fixed in 6.8.0-2023.24 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-78.78+fips1 - Compensating control
In ocfs2_group_add(), uncache the buffer head with ocfs2_remove_from_cache() on the error path when ioctl(OCFS2_IOC_GROUP_ADD, ...) fails, preventing the subsequent ioctl for the same inode from reusing the cached buffer head.
Event History
Frequently Asked Questions
Who is realistically exposed to this issue?
Systems running one of the listed Ubuntu Linux kernel packages are in scope. Exploitation requires local access and high privileges, and the affected code path is in OCFS2.
What access does an attacker need?
The severity vector specifies local attack access, low attack complexity, no user interaction, and high privileges required. The stated impact is limited to availability, consistent with a kernel BUG that can disrupt the system.
How can I recognize a possible occurrence?
A possible occurrence may produce a kernel BUG at fs/ocfs2/uptodate.c:509, with stack frames including ocfs2_set_new_buffer_uptodate, ocfs2_group_add, and ocfs2_ioctl.