{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2024-26798", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.179Z", "datePublished": "2024-04-04T08:20:27.195Z", "dateUpdated": "2024-08-02T00:14:13.539Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:22:57.990Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: always restore the old font data in fbcon_do_set_font()\n\nCommit a5a923038d70 (fbdev: fbcon: Properly revert changes when\nvc_resize() failed) started restoring old font data upon failure (of\nvc_resize()). But it performs so only for user fonts. It means that the\n\"system\"/internal fonts are not restored at all. So in result, the very\nfirst call to fbcon_do_set_font() performs no restore at all upon\nfailing vc_resize().\n\nThis can be reproduced by Syzkaller to crash the system on the next\ninvocation of font_get(). It's rather hard to hit the allocation failure\nin vc_resize() on the first font_set(), but not impossible. Esp. if\nfault injection is used to aid the execution/failure. It was\ndemonstrated by Sirius:\n BUG: unable to handle page fault for address: fffffffffffffff8\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD cb7b067 P4D cb7b067 PUD cb7d067 PMD 0\n Oops: 0000 [#1] PREEMPT SMP KASAN\n CPU: 1 PID: 8007 Comm: poc Not tainted 6.7.0-g9d1694dc91ce #20\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n RIP: 0010:fbcon_get_font+0x229/0x800 drivers/video/fbdev/core/fbcon.c:2286\n Call Trace:\n \n con_font_get drivers/tty/vt/vt.c:4558 [inline]\n con_font_op+0x1fc/0xf20 drivers/tty/vt/vt.c:4673\n vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]\n vt_ioctl+0x632/0x2ec0 drivers/tty/vt/vt_ioctl.c:752\n tty_ioctl+0x6f8/0x1570 drivers/tty/tty_io.c:2803\n vfs_ioctl fs/ioctl.c:51 [inline]\n ...\n\nSo restore the font data in any case, not only for user fonts. Note the\nlater 'if' is now protected by 'old_userfont' and not 'old_data' as the\nlatter is always set now. (And it is supposed to be non-NULL. Otherwise\nwe would see the bug above again.)" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/core/fbcon.c" ], "versions": [ { "version": "ebd6f886aa24", "lessThan": "20a4b5214f7b", "status": "affected", "versionType": "git" }, { "version": "a5a923038d70", "lessThan": "2f91a96b892f", "status": "affected", "versionType": "git" }, { "version": "a5a923038d70", "lessThan": "73a6bd68a134", "status": "affected", "versionType": "git" }, { "version": "a5a923038d70", "lessThan": "a2c881413dcc", "status": "affected", "versionType": "git" }, { "version": "a5a923038d70", "lessThan": "00d6a284fcf3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/core/fbcon.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.151", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.81", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.21", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.7.9", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.8", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/20a4b5214f7bee13c897477168c77bbf79683c3d" }, { "url": "https://git.kernel.org/stable/c/2f91a96b892fab2f2543b4a55740c5bee36b1a6b" }, { "url": "https://git.kernel.org/stable/c/73a6bd68a1342f3a44cac9dffad81ad6a003e520" }, { "url": "https://git.kernel.org/stable/c/a2c881413dcc5d801bdc9535e51270cc88cb9cd8" }, { "url": "https://git.kernel.org/stable/c/00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f" } ], "title": "fbcon: always restore the old font data in fbcon_do_set_font()", "x_generator": { "engine": "bippy-a5840b7849dd" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26798", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-04-08T20:53:12.971429Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:48:30.291Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:13.539Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/20a4b5214f7bee13c897477168c77bbf79683c3d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2f91a96b892fab2f2543b4a55740c5bee36b1a6b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/73a6bd68a1342f3a44cac9dffad81ad6a003e520", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a2c881413dcc5d801bdc9535e51270cc88cb9cd8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f", "tags": [ "x_transferred" ] } ] } ] } }