Ubuntu: (CVE-2022-48795): linux vulnerability

Ubuntu: (CVE-2022-48795): linux vulnerability

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

07/16/2024

Created

11/21/2024

Added

11/19/2024

Modified

02/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: parisc: Fix data TLB miss in sba_unmap_sg Rolf Eike Beer reported the following bug: [1274934.746891] Bad Address (null pointer deref?): Code=15 (Data TLB miss fault) at addr 0000004140000018 [1274934.746891] CPU: 3 PID: 5549 Comm: cmake Not tainted 5.15.4-gentoo-parisc64 #4 [1274934.746891] Hardware name: 9000/785/C8000 [1274934.746891] [1274934.746891]YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI [1274934.746891] PSW: 00001000000001001111111000001110 Not tainted [1274934.746891] r00-03000000ff0804fe0e 0000000040bc9bc0 00000000406760e4 0000004140000000 [1274934.746891] r04-070000000040b693c0 0000004140000000 000000004a2b08b0 0000000000000001 [1274934.746891] r08-110000000041f98810 0000000000000000 000000004a0a7000 0000000000000001 [1274934.746891] r12-150000000040bddbc0 0000000040c0cbc0 0000000040bddbc0 0000000040bddbc0 [1274934.746891] r16-190000000040bde3c0 0000000040bddbc0 0000000040bde3c0 0000000000000007 [1274934.746891] r20-230000000000000006 000000004a368950 0000000000000000 0000000000000001 [1274934.746891] r24-270000000000001fff 000000000800000e 000000004a1710f0 0000000040b693c0 [1274934.746891] r28-310000000000000001 0000000041f988b0 0000000041f98840 000000004a171118 [1274934.746891] sr00-0300000000066e5800 0000000000000000 0000000000000000 00000000066e5800 [1274934.746891] sr04-070000000000000000 0000000000000000 0000000000000000 0000000000000000 [1274934.746891] [1274934.746891] IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000406760e8 00000000406760ec [1274934.746891]IIR: 48780030ISR: 0000000000000000IOR: 0000004140000018 [1274934.746891]CPU:3 CR30: 00000040e3a9c000 CR31: ffffffffffffffff [1274934.746891]ORIG_R28: 0000000040acdd58 [1274934.746891]IAOQ[0]: sba_unmap_sg+0xb0/0x118 [1274934.746891]IAOQ[1]: sba_unmap_sg+0xb4/0x118 [1274934.746891]RP(r2): sba_unmap_sg+0xac/0x118 [1274934.746891] Backtrace: [1274934.746891][<00000000402740cc>] dma_unmap_sg_attrs+0x6c/0x70 [1274934.746891][<000000004074d6bc>] scsi_dma_unmap+0x54/0x60 [1274934.746891][<00000000407a3488>] mptscsih_io_done+0x150/0xd70 [1274934.746891][<0000000040798600>] mpt_interrupt+0x168/0xa68 [1274934.746891][<0000000040255a48>] __handle_irq_event_percpu+0xc8/0x278 [1274934.746891][<0000000040255c34>] handle_irq_event_percpu+0x3c/0xd8 [1274934.746891][<000000004025ecb4>] handle_percpu_irq+0xb4/0xf0 [1274934.746891][<00000000402548e0>] generic_handle_irq+0x50/0x70 [1274934.746891][<000000004019a254>] call_on_stack+0x18/0x24 [1274934.746891] [1274934.746891] Kernel panic - not syncing: Bad Address (null pointer deref?) The bug is caused by overrunning the sglist and incorrectly testing sg_dma_len(sglist) before nents. Normally this doesn't cause a crash, but in this case sglist crossed a page boundary. This occurs in the following code: while (sg_dma_len(sglist) && nents--) { The fix is simply to test nents first and move the decrement of nents into the loop.

Solution(s)

• ubuntu-upgrade-linux
• ubuntu-upgrade-linux-aws
• ubuntu-upgrade-linux-aws-5-4
• ubuntu-upgrade-linux-aws-fips
• ubuntu-upgrade-linux-aws-hwe
• ubuntu-upgrade-linux-azure
• ubuntu-upgrade-linux-azure-4-15
• ubuntu-upgrade-linux-azure-5-4
• ubuntu-upgrade-linux-azure-fips
• ubuntu-upgrade-linux-bluefield
• ubuntu-upgrade-linux-fips
• ubuntu-upgrade-linux-gcp
• ubuntu-upgrade-linux-gcp-4-15
• ubuntu-upgrade-linux-gcp-5-4
• ubuntu-upgrade-linux-gcp-fips
• ubuntu-upgrade-linux-gkeop
• ubuntu-upgrade-linux-hwe
• ubuntu-upgrade-linux-hwe-5-4
• ubuntu-upgrade-linux-ibm
• ubuntu-upgrade-linux-ibm-5-4
• ubuntu-upgrade-linux-intel-iotg-5-15
• ubuntu-upgrade-linux-iot
• ubuntu-upgrade-linux-kvm
• ubuntu-upgrade-linux-oracle
• ubuntu-upgrade-linux-oracle-5-4
• ubuntu-upgrade-linux-raspi
• ubuntu-upgrade-linux-raspi-5-4

References

• https://attackerkb.com/topics/cve-2022-48795
• CVE - 2022-48795
• https://git.kernel.org/linus/b7d6f44a0fa716a82969725516dc0b16bc7cd514
• https://git.kernel.org/stable/c/867e50231c7605547d9334904d70a181f39f2d9e
• https://git.kernel.org/stable/c/8c8e949ae81e7f5ab58f9f9f8e9b573b93173dd2
• https://git.kernel.org/stable/c/b7d6f44a0fa716a82969725516dc0b16bc7cd514
• https://git.kernel.org/stable/c/de75676ee99bf9f25b1124ff301b3f7b8ba597d4
• https://git.kernel.org/stable/c/e40ae3133ed87d6d526f3c8fc6a5f9a2d72dcdbf
• https://git.kernel.org/stable/c/efccc9b0c7e28d0eb7918a236e59f60dc23db4c3
• https://git.kernel.org/stable/c/f23f0444ead4d941165aa82ce2fcbb997dc00e97
• https://git.kernel.org/stable/c/f8f519d7df66c334b5e08f896ac70ee3b53add3b
• https://www.cve.org/CVERecord?id=CVE-2022-48795

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